Kari A. Peter, Ph.D.

Kari A. Peter, Ph.D.

  • Associate Research Professor, Tree Fruit Pathology
Penn State Fruit Research and Extension Center
290 University Dr.
P.O. Box 330

Biglerville, PA 17307

Areas of Expertise

  • Apple and pear diseases
  • Peach, cherry, other stone fruit diseases
  • Integrated tree fruit disease management

Education

  • Ph.D. Plant Pathology, Cornell University
  • M.S. Plant Pathology, Cornell University
  • B.S. Agriculture, University of Delaware, cum laude, Degree with Distinction

Areas of interest

Commercial tree fruit disease management: Diseases of stone and pome fruit, especially those caused by bacteria, apple fruit rots, and emerging issues; educational programming for integrated management for pre- and postharvest tree fruit diseases and fungicide resistance

Current Graduate Students

  • Johanny Castro, Ph.D. student in Plant Pathology
  • Cameron Mehalek, M.S. student in Plant Pathology

The Tree Fruit Pathology Program at Penn State

Growing tree fruit is a huge industry in the Mid-Atlantic region, with Pennsylvania the fourth largest producer of apples and fifth for peaches in the United States. I am located at the Penn State Fruit Research and Extension Center in Biglerville, PA in Adams County, where 75% of the tree fruit in PA are grown. (To note: we are in south central PA and approximately 120 miles south of main campus in University Park, PA.) 

My Extension Program focuses on educating commercial growers about effective, sustainable disease management strategies for important diseases problematic in the region. This includes regular participation in winter educational meetings and spring/summer twilight meetings and timely articles and disease updates in the online periodical Fruit Times. In addition, since we're located in the heart of the apple country, we regularly answer questions from "walk-ins", phone calls, and emails from growers, crop consultants, Extension educators, journalists, and anyone with a burning question about tree fruit diseases.

My philosophy for addressing Pennsylvania's commercial tree fruit industry research needs is to follow a holistic approach: all pest management systems (organic to conventional) and full circle (pre- and postharvest diseases). My research program includes: developing season-long management strategies for controlling bacterial diseases, specifically fire blight and bacterial spot of peach, and apple fruit rot diseases occurring during the season and while storage; identifying possible emerging pre- and postharvest apple fruit rots, as well as monitoring for exotic pathogens; and working closely with agrochemical companies for evaluating chemistries and alternative products for suitability and efficacy in controlling tree fruit diseases under Pennsylvania environmental conditions.

Publications

Khodadadi, F., Martin, P. L., Donahue, D. J., Peter, K., and Aćimović, S. G. 2022. Characterizations of an Emerging Disease: Apple Blotch Caused by Diplocarpon coronariae (syn. Marssonina coronaria) in the Mid-Atlantic United States. Plant Disease. 106: https://doi.org/10.1094/PDIS-11-21-2557-RE

Martin, P. L., Krawczyk, T., Pierce, K., Thomas, C. A., Khodadadi, F., Acimovic, S. G. and Peter, K. 2022. Fungicide sensitivity of Colletotrichum species causing bitter rot of apple in the Mid-Atlantic United States. Plant Disease. 106: https://doi.org/10.1094/PDIS-06-21-1142-RE

Martin, P. L., King, W., Bell, T. H. and Peter, K. 2022. The decay and fungal succession of apples with bitter rot across a vegetation diversity gradient. Phytobiomes. 6: 26. https://doi.org/10.1094/PBIOMES-06-21-0039-R  

Martin, P. L., Krawczyk, T., Khodadadi, F., Aćimović, S. G., and Peter, K.A. 2021. Bitter Rot of Apple in the Mid-Atlantic US: Causal Species and Evaluation of the Impacts of Regional Weather Patterns and Cultivar SusceptibilityPhytopathology. 111: https://doi.org/10.1094/PHYTO-09-20-0432-R

Martin, P. L. and Peter, K. A. 2021. Quantification of Colletotrichum fioriniae in orchards and deciduous forests indicates it is primarily a leaf endophyte. Phyotopathology. 111: https://doi.org/10.1094/PHYTO-05-20-0157-R

Khodadadi, F., Gonzalez, J. B., Martin, P. L., Giroux, E., Bilodeau, G. J., Peter, K. A., Doyle, V. P., and Acimovic, S. G., 2020. Identification and characterization of Colletotrichum species causing apple bitter rot in New York and description of noveboracense sp. nov.. Scientific Reports. 10: 11043. doi.org/10.1038/s41598-020-66761-9 

Klee, S., Sinn, J. P., Christian, E., Holmes, A., Zhao, K., Lehman, B. L., Peter, K. A., Rosa, C. R., and McNellis, T. W. 2020. Virulence genetics of an Erwinia amylovora putative polysaccharide transporter family member. Journal of Bacteriology. DOI:1128/JB.00390-20

Nikolaeva, E. V., Knier, R., Molnar, C., Peter, K., Jones, T., and Costanzo, S. 2020. First Report of Strawberry (Fragaria × ananassa) as a Host of a ‘Candidatus Phytoplasma americanum’-Related Strain in the United States. Plant Disease. 104 (2): 560. doi.org/10.1094/PDIS-09-19-1843-PDN

Jurick, W. M., Peng, H., Beard, H. S., Garrett, W. M., Lichtner, F. J., Luciano-Rosario, D., Macarisin, O., Liu, Y., Peter, K. A., Gaskins, V. L., Yang, T., Mowery, J., Bauchan, G., Keller, N. P., and Cooper, B. (2020). Blistering1 modulates Penicillium expansum virulence via vesicle-mediated protein secretion. Molecular and Cellular Proteomics, 19(2), 344-361. doi.org/10.1074/mcp.RA119.001831

Jurick, W. M., Macarisin, O., Gaskins, V., Janisiewicz, W. J., Peter, K. A., & Cox, K. 2019. Baseline Sensitivity of Penicillium spp. to Difenoconazole. Plant Disease. Plant Disease. 103: 331-337.

Wu, G., Jurick, W. M., Lichtner, F. J., Peng, H., Yin, G., Gaskins, V., Yin, Y., Hua, S. S. T., Peter, K. A., & Bennett, J. 2019. Whole-genome comparisons of Penicillium spp. reveals secondary metabolic gene clusters and candidate genes associated with fungal aggressiveness during apple fruit decay. PeerJ. 7:e6170 http://doi.10.7717/peerj.6170

Klee, S., Mostafa, I., Chen, S., Dufresne, C., Lehman, B., Sinn, J., Peter, K. A., & McNellis, T. W. 2018. Erwinia amylovora yjeK mutant exhibits reduced virulence, increased chemical sensitivity, and numerous environmentally dependent proteomic alterations. Molecular Plant Pathology. 19(7): 1652-1666.

Lui, H.-W., Wu, L.-P., Nikolaeva, E., Peter, K. A., Liu, Z., Mollov, D., Cao, M.-J., & Li, R. 2018. Discovery and molecular characterization of a new luteovirus identified by high-throughput sequencing associated with rapid apple decline. Virology Journal. 15: 85-93. http://doi.org/10.1186/s12985-018-0998-3

Jurick II, W. M., Peng, H.,  Macarasin, O., Gaskins, V. L., Macarasin, O., Yu, J., Janisiewicz, J. E., Peter, K. A. 2017. Dominant Selectable Markers for Penicillium spp. Transformation and Gene Function Studies. Fungal Genomics and Biology. 7:153 doi:10.4172/2165-8056.1000153

Jurick II, W. M., Macarasin, O., Gaskins, V. L., Park, E., Yu, J., Janisiewicz, J. E., Peter, K. A. 2017. Characterization of postharvest fungicide-resistant Botryis cincerea isolates from commercially stored apple fruit. Phytopathology. 107 (3): 362 - 368.

Nikolaeva, N., Welliver, R., Rosa, C., Jones, T., Peter, K., Costanzo, S., and Davis, R.E. 2017. First report of apple (Malus domestica) as a host of 'Candidatus Phytoplasma pruni' in the United States. Plant Disease. 101 (2): 378.

Ramos, L. S., Sinn, J., Lehman, B. L., Pfeufer, E., Peter, K. A., and McNellis, T. W. 2015. An Erwinia amylovora pyrC mutant is auxotrophic for pyrimidine yet causes fire blight in apple tree shoots and grows in immature pear and apple fruit tissue.  Letters in Applied Microbiology. 60 (6): 572 - 579.

Peter, K. A., Gaskins V. L., Lehman, B., and Jurick II, W. M.  2015.  First Report of Brown Rot on Apple Fruit Caused by Monilinia fructicola in Pennsylvania  Plant Disease.  99 (8): 1179.

Ramos, L. S., Lehman, B. L., Peter, K. A., and McNellis, T. W.  2014. Mutation of the Erwinia amylovora argD gene causes arginine auxotrophy, nonpathogenicity in apples, and reduced virulence in pears.  Applied and Environmental Microbiology. 80 (21): 6739 - 6749.

Vico, I., Gaskins, V., Duduk, N., Vasić, M., Yu, J., Peter, K.A., and Jurick II, W. M.  2014. First report of Penicillium crustosum causing blue mold on stored apple fruit in Serbia. Plant Disease. 98 (10): 1430.

Janisiewicz, W. J., Jurick II, W .M., Peter, K. A., Kurtzman, C. P., and Buyer, J. S.  2014. Yeasts associated with plums and their potential for controlling brown rot after harvest. Yeast. 31 (6): 207 – 218.

Jurick II, W. M., Vico, I., Gaskins, V. L., Janisiewicz, W. J., and Peter, K. A.  2013. Initial description of Neofusicoccum ribis causing postharvest decay of apple fruit from cold storage in Pennsylvania. Plant Disease. 97 (7): 999.

Jurick II, W. M., Vico, I., Gaskins, V. L., Janisiewicz, W. J., and Peter, K. A.  2013. First report of Botryosphaeria dothidea causing white rot on apple fruit in Maryland.  Plant Disease. 97 (7): 999.

Janisiewicz, W. J., Jurick II, W .M., Vico, I., Peter, K. A., Buyer, J. S.  2013.  Culturable bacteria of plums and their potential for control of brown rot after harvest.  Postharvest Biology and Technology.  76: 145 - 151.

Peter, K. A., Vico, I., Gaskins V. L., Janisiewicz, W. J., Saftner, R. A., and Jurick II, W. M.  2012.  First report of Penicillium carneum causing blue mold on stored apples in Pennsylvania.  Plant Disease.  96 (12): 1823. 

Cilia, M.*, Peter, K. A.*, Bereman, M. S.*, Howe, K., Fish, T., Smith, D., Gildow, F., MacCoss, M. J., Thannhauser, T. and Gray, S. M.  2012.  Host proteins implicated in the aphid transmission of cereal yellow dwarf virus.  PLoS One.  7(10): e48177.doi:10.1371/journal.pone.0048177.  (*Authors contributed equally.)

Jurick II, W. M., Vico, I. Gaskins V. L., Peter, K. A., Janisiewicz, W. J. and Conway, W. S.  2012.  Nutritional cues and ambient pH modulate the in vitro activity a of polygalacturonase isozyme produced by Penicillium expansum. 2012.  Archives of Phytopathology and Plant Protection.  45(9): 1101 - 1114. 

Peter, K. A., Gildow, F., Palukaitis, P. and Gray, S. M.  2009.  The C-terminus of the polervirus P5 domain limits virus infection to the phloem.  Journal of Virology. 83 (11): 5419 - 5429.  (*Cover illustration for issue.)

Peter, K. A., Liang, D., Palukaitis, P. and Gray, S. M.  2008.  Small deletions in the potato leafroll virus readthrough protein affect particle morphology, aphid transmission, virus movement and accumulation.  Journal of General Virology. 89 (8): 2046 - 2054. 

Publications

Systemic pesticides in a solitary bee pollen food store affect larval development and increase pupal mortality
Science of the Total Environment, Phan, Ngoc T., Joshi, Neelendra K., Rajotte, Edwin G., Zhu, Fang, Peter, Kari A., López-Uribe, Margarita M., Biddinger, David J., 2024

The Rapid Apple Decline Phenomenon: Current Status and Expected Associated Factors in Korea
Plant Pathology Journal, Lee, Seung Yeol, Peter, Kari A., Das, Kallol, Diane, Avalos Ruiz, Jung, Hee Young, 2023

Integration of Chitosan and Biopesticides to Suppress Pre-Harvest Diseases of Apple
Horticulturae, DeGenring, Liza, Peter, Kari, Poleatewich, Anissa, 2023

Would You Like Wood or Plastic? Bin Material, Sanitation Treatments, and Bin Inoculum Levels Impact Blue Mold Decay of Stored Apple Fruit
Plant Disease, Jurick, Wayne M., Choi, Mei Wah, Gaskins, Verneta L., Peter, Kari A., Cox, Kerik D., 2023

Evaluation of biopesticides for the control of Erwinia amylovora in apple and pear
Journal of Plant Pathology, DuPont, S. Tianna, Cox, Kerik, Johnson, Ken, Peter, Kari, Smith, Tim, Munir, Misbakhul, Baro, Aina, 2023

Evaluation of pruning therapies in apple trees with fire blight
Journal of Plant Pathology, DuPont, S. Tianna, Munir, Misbakhul, Cox, Kerik, Johnson, Ken, Peter, Kari, Baro, Aina, 2023

2022 Disease Update: Consider Fungicide Applications Ahead of Hurricane Ian Remnants
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Diseases for the Grower Radar During Harvest
Penn State Fruit Times, Peter, Kari, 2022

Testing Biofumigation as an Option for Nematode Control
Penn State Fruit Times, Peter, Kari, Harper, J, Kime, L, 2022

Characterizations of an Emerging Disease: Apple Blotch Caused by Diplocarpon coronariae (syn. Marssonina coronaria) in the Mid-Atlantic United States
Plant Disease, Khodadadi, Fatemeh, Martin, Phillip L., Donahue, Daniel J., Peter, Kari A., Acimovic, Srd An G., 2022

2022 Disease Update: Management for Sooty Blotch and Flyspeck, Fire Blight, and Bacterial Spot
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Prevent Bitter Rot on Apple
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Beware of fire blight conditions May 13-20
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Fire blight risk for May 4 and 5
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Scout for fire blight and apple scab infections
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Bloom recommendations
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Potential for Apple Scab and Brown Rot Blossom Blight Infection Conditions This Week
Penn State Fruit Times, Peter, Kari, 2022

2022 Disease Update: Dormant copper sprays and orchard sanitation
Penn State Fruit Times, Peter, Kari, 2022

Fungicide Sensitivity of Colletotrichum Species Causing Bitter Rot of Apple in the Mid-Atlantic U.S.A.
Plant Disease, Martin, Phillip L., Krawczyk, Teresa, Pierce, Kristen, Thomas, Catherine, Khodadadi, Fatemeh, Aćimović, Srd An G., Peter, Kari A., 2022

Genetic Diversity of Listeria monocytogenes Isolated From Three Commercial Tree Fruit Packinghouses and Evidence of Persistent and Transient Contamination
Frontiers in Microbiology, Chen, Yi, Simonetti, Tobin, Peter, Kari Anne, Jin, Qing, Brown, Eric, LaBorde, Luke F., Macarisin, Dumitru, 2022

PATHMAP (Pathogen And Tree fruit Health MAP): A Smartphone App and Interactive Dashboard to Record and Map Tree Fruit Diseases, Disorders, and Insect Pests
PhytoFrontiers, Jurick, W, Messinger, L, Wallis, A, Peter, Kari, Villani, S, Bradshaw, M, Bartholomew, None, Buser, M, Acimovic, S, Fonesca, J, Cox, K, 2022

Putative transcription antiterminator RfaH contributes to Erwinia amylovora virulence
Molecular Plant Pathology, Klee, Sara, Sinn, Judith P., Held, Jeremy, Vosburg, Chad, Vosburg, J, Holmes, Aleah, Lehman, Brian, Peter, K, McNellis, Timothy, 2022

Prevalence and Distribution of Listeria monocytogenes in Three Commercial Tree Fruit Packinghouses
Frontiers in Microbiology, Simonetti, Tobin, Peter, Kari, Chen, Yi, Jin, Qing, Zhang, Guodong, LaBorde, Luke F., Macarisin, Dumitru, 2021

Bitter rot of apple in the mid-atlantic united states: Causal species and evaluation of the impacts of regional weather patterns and cultivar susceptibility
Phytopathology, Martin, Phillip L., Krawczyk, Teresa, Khodadadi, Fatemeh, Aćimović, Srdan G., Peter, Kari A., 2021

Fungicide sensitivity of Colletotrichum species causing bitter rot of apple in the Mid-Atlantic United States
Plant Disease, Martin, P, Krawczyk, T, Pierce, K, Thomas, C, Khodadadi, F, Acimovic, S, Peter, K, 2021

2021 Disease Update: Apple scab infection event April 24-25
Penn State Fruit Times, Peter, Kari, 2021

2021 Disease Update: Bitter rot management begins
Penn State Fruit Times, Peter, Kari, 2021

2021 Disease Update: First apple scab spore detected
Penn State Fruit Times, Peter, Kari, 2021

2021 Disease Update: Mature apple scab spores peak is near
Penn State Fruit Times, Peter, Kari, 2021

2021 Disease Update: Reapply fungicides after major rain events
Penn State Fruit Times, Peter, Kari, 2021

Investigating the role of viruses, herbicides, and soil fertility in rapid apple decline
Pennsylvania Fruit News, Peter, K, 2021

Managing apple fruit rots and other headaches in the orchard
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2021

New disease for PA fruit growers: Southern blight of apple
Penn State Fruit Times, Peter, Kari, 2021

The Decay and Fungal Succession of Apples with Bitter Rot Across a Vegetation Diversity Gradient
Phytobiomes Journal, Martin, Phillip, King, William, Bell, Terrence, Peter, Kari Anne, 2021

Identification and fungicide resistance profile of pathogens causing postharvest rots on apples in Pennslyvania
Pennsylvania Fruit News, Castro, J, Peter, K, 2021

Persistence of early season bitter rot infections, evaluation of alternative bitter rot control strategies, and determination of spore dispersal of Marssonina (Diplocarpon) coronaria
Pennsylvania Fruit News, Martin, P, Thomas, C, Krawczyk, T, Lehman, B, Peter, K, 2021

Author Correction: Identification and characterization of Colletotrichum species causing apple bitter rot in New York and description of C. noveboracense sp. nov (Scientific Reports, (2020), 10, 1, (11043), 10.1038/s41598-020-66761-9)
Scientific Reports, Khodadadi, Fatemeh, González, Jonathan B., Martin, Phillip L., Giroux, Emily, Bilodeau, Guillaume J., Peter, Kari A., Doyle, Vinson P., Aćimović, Srđan G., 2020

Virulence genetics of an erwinia amylovora putative polysaccharide transporter family member
Journal of Bacteriology, Klee, Sara, Sinn, Judith P., Christian, Elena, Holmes, Aleah, Zhao, Kaixi, Lehman, Brian, Peter, Kari A., Rosa, Cristina, McNellis, Timothy, 2020

First report of strawberry (Fragaria × ananassa) as a host of a 'Candidates phytoplasma americanum'-related strain in the United States
Plant Disease, Nikolaeva, E. V., Knier, R., Molnar, C., Peter, K., Jones, T., Costanzo, S., 2020

Blistering1 modulates penicillium expansum virulence via vesicle-mediated protein secretion
Molecular and Cellular Proteomics, Jurick, Wayne M., Peng, Hui, Beard, Hunter S., Garrett, Wesley M., Lichtner, Franz J., Luciano-Rosario, Dianiris, Macarisin, Otilia, Liu, Yingjian, Peter, Kari A., Gaskins, Verneta L., Yang, Tianbao, Mowery, Joseph, Bauchan, Gary, Keller, Nancy P., Cooper, Bret, 2020

Apple disease control: Bloom through petal fall
Penn State Fruit Times, Peter, Kari, 2020

Disease Update: 2020 Orchard sanitation and disease prevention
Penn State Fruit Times, Peter, Kari, 2020

Investigating the role of viruses and other causes in rapid apple decline
Pennsylvania Fruit News, Peter, K, 2020

Managing apple and peach diseases during an unpredictable season
Penn State Fruit Times, Peter, Kari, 2020

Many important fungicides under review by EPA: Submit comments by January 4, 2021
Penn State Fruit Times, Peter, Kari, 2020

Optimizing fire blight control alternatives: Non-antibiotic blossom protection and full season shoot blight management
Pennsylvania Fruit News, Peter, K, McNellis, T, Lehman, B, Sinn, J, 2020

Thiophanate methyl under review by EPA: Submit comments by August 20
Penn State Fruit Times, Peter, Kari, 2020

Investigating sources for postharvest apple rot fungi in the field and packhouse: conceptual framework and preliminary results
Proceedings of the 95th Annual Cumberland Shenandoah Fruit Workers Conference, Castro, J, Peter, K, 2020

Quantification of Colletotrichum fioriniae in the forest suggests its main ecological role is that of a leaf endophyte
Proceedings of the 95th Annual Cumberland Shenandoah Fruit Workers Conference, Martin, P, Peter, K, 2020

Sensitivity distribution to 11 fungicides in a population of Colletotrichum isolates from apple
Proceedings of the 95th Annual Cumberland Shenandoah Fruit Workers Conference, Pierce, K, Thomas, C, Martin, P, Peter, K, 2020

Completing the picture: Characterizing bitter rot fungal isolates in the lab and field
Pennsylvania Fruit News, Martin, P, Krawczyk, T, Lehman, B, Peter, K, 2020

Investigating and understanding different sources for fruit rot fungi in the packhouse and field to better control postharvest decay of stored apple
Pennsylvania Fruit News, Castro, J, Peter, K, 2020

Baseline sensitivity of penicillium spp. To difenoconazole
Plant Disease, Jurick, Wayne M., Macarisin, Otilia, Gaskins, Verneta L., Janisiewicz, Wojciech J., Peter, Kari A., Cox, Kerik D., 2019

Extragenic suppression of elongation factor P gene mutant phenotypes in erwinia amylovora
Journal of Bacteriology, Klee, Sara, Sinn, Judith P., Holmes, Aleah, Lehman, Brian, Krawczyk, Teresa, Kraczyk, Teresa, Peter, Kari A., McNellis, Timothy W., 2019

Whole-genome comparisons of Penicillium spp. Reveals secondary metabolic gene clusters and candidate genes associated with fungal aggressiveness during apple fruit decay
PeerJ, Wu, Guangxi, Jurick, Wayne M., Lichtner, Franz J., Peng, Hui, Yin, Guohua, Gaskins, Verneta L., Yin, Yanbin, Hua, Sui Sheng, Peter, Kari A., Bennett, Joan W., 2019

Manipulating Wild and Tamed Phytobiomes: Challenges and Opportunities
Phytobiomes Journal, Collins, Alyssa, Bell, Terrence H, Hockett, Kevin, Esker, P, Alcala-Briseno, Ricardo, Gugino, B, Alcalá-Briseño, Ricardo, Barbercheck, Mary, Peter, K, Beattie, Gwyn, Bruns, Mary Ann, Carlson, John, Chung, Taejung, Collins, A, Emmett, Bryan, Esker, Paul, Garrett, Karen, Glenna, Leland, Gugino, Beth K., Del Mar Jiménez-Gasco, María, del Mar Jimenez Gasco, M, Jimenez Gasco, Maria del Mar, Kinkel, Linda, Kovac, Jasna, Kowalski, Kurt, Kowalski, Kurt, Leveau, Johan, Myrick, J, Kuldau, Gretchen, Peter, K, Leveau, Johan, Michalska-Smith, Matthew, Salazar, Maria, Myrick, Jessica, Shade, Ashley, Peter, Kari, Stopnisek, Nejc, Tan, Xiaoqing, Vivanco Salazar, Maria fernanda, Salazar, Maria, Shade, Ashley, Welty, Amy, Stopinsek, Nejc, Stopnisek, Nejc, Wickings, Kyle, Yergeau, Etienne, Tan, Xiaoqing, Welty, Amy, Wickings, Kyle, Wickings, Etienne, Yergeau, Etienne, 2019

Marssonina Blotch of Apple Caused by Marssonina coronaria in New York
Phytopathology, Khodadadi, F, Peter, Kari, Donahue, D, Acimovic, S, 2019

Pennsylvania Orchards for Rapid Apple Decline
Phytopathology, Nikolaeva, E, Peter, Kari, Li, R, Jones, T, Knier, R, Molnar, C, 2019

2018 Pennsylvania update: RAD, new diseases, promising products
Proceedings of the Cumberland-Shenandoah Fruit Workers Conference 94th Annual Meeting, Peter, Kari, 2019

Using post dormant copper applications for fungal disease control
Proceedings of the Cumberland-Shenandoah Fruit Workers Conference 94th Annual Meeting, Lehman, B, Peter, Kari, 2019

Aerial applications of streptomycin and oxytetracycline under review by EPA: Submit comments by May 17
Penn State Fruit Times, Peter, Kari, 2019

Apple scab infection forecasted
Penn State Fruit Times, Peter, Kari, 2019

Apple Trees Beware: Watch Out for Marssonina Blotch on Apple Trees
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2019

Captan under review by EPA: submit grower comments by March 15
Penn State Fruit Times, Peter, Kari, 2019

Disease update: Apple scab issues and tree decline
Penn State Fruit Times, Peter, Kari, 2019

Disease update: Managing tree fruit rots in the 2019 season
Penn State Fruit Times, Peter, Kari, 2019

Disease update: Nectria twig blight or fire blight?
Penn State Fruit Times, Peter, Kari, 2019

Evaluating the efficacy of a new postharvest fungicide and developing tools to monitor fungicide resistance in blue mold populations
Pennsylvania Fruit News, Peter, Kari, 2019

Exploration and development of novel fire blight management strategies: Bacterial antagonists and plant immune stimulation
Pennsylvania Fruit News, Peter, Kari, McNellis, T, Lehman, B, Sinn, J, Klee, S, 2019

Investigating the role of viruses in rapid apple decline
Pennsylvania Fruit News, Peter, Kari, 2019

Managing Tree Fruit Rots This Season
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2019

Spraying by the numbers: Fungicide resistance management
Penn State Fruit Times, Peter, Kari, 2019

Tree fruit disease update: Preventing late season disease issues
Penn State Fruit Times, Peter, Kari, 2019

Understanding why biocontrol fails to protect against fire blight in the eastern U.S.
Pennsylvania Fruit News, Hockett, K, Peter, Kari, May, A, 2019

Be alert: Important apple diseases from bloom through petal fall
Country Focus, Peter, Kari, 2019

Causal Species Distributions and Climatic Correlations in Pennsylvania
Phytopathology, Martin, P, Krawczyk, T, Peter, Kari, 2019

Bitter rot of apple: What we learned in 2018
Proceedings of the Cumberland-Shenandoah Fruit Workers Conference 94th Annual Meeting, Martin, P, Krawczyk, T, Lehman, B, Peter, Kari, 2019

Assessment of resistance to pre- and postharvest site-specific fungicides in populations of fungi that cause bitter rot in Pennsylvania orchards
Pennsylvania Fruit News, Martin, P, Krawczyk, T, Lehman, B, Peter, Kari, 2019

Erwinia amylovora auxotrophic mutant exometabolomics and virulence on apples
Applied and Environmental Microbiology, Klee, Sara, Sara, Klee, Sinn, Judith, Finley, Melissa, Allman, Erik, Smith, Philip B., Aimufua, Osaretin, Sitther, Viji, Lehman, Brian, Kraczyk, Teresa, Krawczyk, Teresa, Peter, Kari A., McNellis, Timothy, 2019

Evaluation of low rates of Apogee for shoot blight control, 2018
Horticulture Technology Newsletter, Peter, Kari, Lehman, Brian, 2018

Disease Update: Cleaning Up the Messy 2018 Season
Penn State Fruit Times Newsletter, Peter, Kari, 2018

End-Of-Season Loose Ends: Weather Station Maintenance
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2018

Late Season Surprise: Marssonina Blotch on Apple Trees
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2018

Looking ahead: Manage tree fruit diseases now for the 2019 season
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, 2018

Disease Update: Marssonina Leaf Blotch
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Random T-DNA mutagenesis reveals gene candidates modulating pat hogen virulence in postharvest Penicillium-apple fruit interactions
Phytopathology, Peng, Hui, Jurick, Wayne, Cox, Kerik, Gaskins, Verneta, Janisiewcz, Wojciech, Peter, Kari, 2018

Evaluation of copper formulations for season-long disease management in apple
Proceedings 93rd Cumberland Shenandoah Fruit Workers Conference, Lehman, Brian, Peter, Kari, 2018

Rapid Apple Decline in Pennsylvania: What we know and where we are going, and investigating the role of viruses in Rapid Apple Decline
Proceedings 93rd Cumberland Shenandoah Fruit Workers Conference, Peter, Kari, Nikolaeva, Ekaterina, Li, Ruhui, Donahue, Daniel, 2018

Wanted: Bitter Rot Of Apple Samples from Pennsylvania Growers
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Managing Fruit Rots This Season
Penn State Fruit Times Newsletter, Peter, Kari, 2018

An Erwinia amylovora yjeK mutant exhibits reduced virulence, increased chemical sensitivity and numerous environmentally dependent proteomic alterations
Molecular Plant Pathology, Klee, Sara M., Mostafa, Islam, Chen, Sixue, Dufresne, Craig, Lehman, brian L., Sinn, Judith P., Peter, Kari A., McNellis, Timothy W., 2018

Mid-Seaseon Tree Fruit Disease Update
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Disase Update: More Advice For Limiting Fire Bight Spread
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Tree Fruit Disease Conditions Were On Steriods In May
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Disease Update: Managing Disease During Wet Weather
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Characterization of a new apple luteovirus identified by high-throughput sequencing
Virology Journal, Liu, Huawei, Wu, Liping, Nikolaeva, Ekaterina, Peter, Kari, Liu, Zongrang, Mollov, Dimitre, Cao, Mengji, Li, Ruhui, 2018

Disease Update: Fire Blight and Scab Risk Conditions Continue This Week
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Discovery and molecular characterization of a new luteovirus identified by high-throughput sequencing associated with rapid apple decline
Virology Journal, Lui, Hua-Wei, Wu, Li-Ping, Nikolaeva, Ekaterina, Peter, Kari, Liu, Zongrang, Mollov, Dimitre, Cao, Meng-Ji, Li, Ruhui, 2018

Mitigating Fire Blight in High Density Orchards
University of Maryland Extension Vegetable and Fruit News, Peter, Kari, Lehman, Brian, 2018

New Fungicide To Control Apple Powdery Mildew: Torino
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Preparing For The Fire Blight Season
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Disease Update: Control For Powdery Mildew and Apple Scab This Week
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Disease Update: Scab Infection Period April 15 - 16, 2018
Penn State Fruit Times Newsletter, Peter, Kari, 2018

State-wide survey of apple orchards experiencing rapid apple decline
Pennsylvania Fruit News, Peter, Kari, 2018

Dormant Copper Sprays And Sanitation For 2018 Disease Management
Penn State Fruit Times Newsletter, Peter, Kari, 2018

Development of phage therapy to mitigate fire blight
Pennsylvania Fruit News, Shariat, Nikki, Peter, Kari, 2018

Exploration and development of novel fire blight management strategies: Bacterial antagonists and plant immune stimulation
Pennsylvania Fruit News, Peter, Kari, McNellis, T, Sinn, Judy, Klee, Sara, 2018

Getting the upper hand on bitter rot of apples: Understanding the fungal culprits, epidemiology, and fungicide resistance, Martin, Phillip, Krawczyk, Teresa, Lehman, Brian, Peter, Kari, 2018

A role for Erwinia amylovora elongation factor P in fire blight disease development
Phytopathology, Klee, Sara, Mostafa, Islam, Chen, Sixue, Dufresne, Craig, Lehman, Brian, Sinn, Judith, Peter, K, McNellis, T, 2017

Botrytis cinerea isolates lacking the Mrr1 R632I mutation are multi-resistant to postharvest fungicides which impacts gray mold management
Phytopathology, Jurick, W, Macarisin, O, Gaskins, V, Vico, I, Yu, J, Peter, Kari, Janisiewicz, W, Cox, K, 2017

Phytoplasma survey in Pennsylvania
Phytopathology, Nikolaeva, E, Peter, Kari, Lesperance, J, Jones, T, Costanzo, S, Davis, R, 2017

End-Of-Season Loose Ends: Weather Station Maintenance
Penn State Fruit Times Newsletter, Peter, Kari, 2017

The final touches on the 2017 season: Disease management considerations
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Fungicides still needed to prevent fruit rot
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Dominant Selectable Markers for Penicillium spp. Transformation and Gene Function Studies
Fungal Genomics and Biology, Jurick II, Wayne, Peng, Hui, Gaskins, Verneta, Vico, Ivana, Yu, Juijiang, Macarisin, Otilia, Janisiewicz, Wojciech, Peter, Kari, 2017

Brown rot management in Pennsylvania: Fungicides and fruit bagging
Proceedings 92nd Cumberland Shenandoah Fruit Workers Conference, Peter, Kari, Lehman, Brian, 2017

Evaluation of Low rates of Kudos and two new prohexadione formulations for suppressing shoot growth and fire blight management
Proceedings 92nd Cumberland Shenandoah Fruit Workers Conference, Lehman, Brian, Winzeler, Edwin, Schupp, J, Peter, Kari, 2017

Managing fire blight in Pennsylvania: What worked and what didn't in 2016
Proceedings 92nd Cumberland Shenandoah Fruit Workers Conference, Peter, Kari, Lehman, Brian, 2017

Keep Apples Free From Fruit Rot This Season: Pre- and Post-harvest
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Managing Fruit Rots This Season
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Getting the Upper Hand on Tree Fruit Diseases in July
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Protecting Cherries From Brown Rot
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Of The Month: Peach Leaf Curl
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Diseases For The Grower Radar For The Month Of June
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Beware Of Fire Blight And Bac Spot Conditions
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Fire Blight, Apple Scab, Rust, Plus Others: Be On Alert
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Blossoms Still Open—Fire blight Risk Continues
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Watch Out For Diseases During Apple Bloom
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Rapid Apple Decline Making you SAD? Complete Our Questionnaire by April 3, 2017
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Scab Infection Period March 27 – April 1
Penn State Fruit Times Newsletter, Peter, Kari, 2017

2017 Season: Disease Management Strategies For The Grower Radar
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Disease Update: Copper sprays and orchard sanitation to manage diseases
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Characterization of postharvest fungicide-resistant botrytis cinerea isolates from commercially stored apple fruit
Phytopathology, Jurick, Wayne M., Macarisin, Otilia, Gaskins, Verneta L., Park, Eunhee, Yu, Jiujiang, Janisiewicz, Wojciech, Peter, Kari A., 2017

First report of apple (Malus domestica) as a host of ‘Candidatus phytoplasma pruni’ in the United States
Plant Disease, Nikolaeva, E. V., Welliver, R., Rosa, C., Jones, T., Peter, K., Costanzo, S., Davis, R. E., 2017

Development of phage therapy to mitigate fire blight
Pennsylvania Fruit News, Shariat, Nikki, Peter, Kari, 2017

Fighting fire blight: Evaluating streptomycin resistance of Erwinia amylovora in PA
Pennsylvania Fruit News, Peter, Kari, Laukaitis, Hanna, 2017

Exploration and development of novel fire blight control strategies, including bacterial antagonists and plant immune stimulation
Pennsylvania Fruit News, Peter, Kari, McNellis, T, Lehman, Brian, Sinn, J, Klee, Sara, 2017

Disease Lesson: Moldy Core Of Apple
Penn State Fruit Times Newsletter, Peter, Kari, 2017

Examining factors in the development of adaptive resistance to oxytetracylcine in Xanthomonas arboricola pv pruni, causal agent of bacterial spot of stone fruit
Pennsylvania Fruit News, Bardsley, S, Peter, K, Jiménez-Gasco, Maria, 2017

Having RAD is Also SAD
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Tree Fruit Disease Management Tips For 2017 Continues: Canker Management
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Mitigating the effects of shoot blight caused by Erwinia amylovora by enhancing plant systemic resistance
Phytopathology, Lehman, Brian, Bower, Carl, Peter, Kari, 2016

Monitoring Pennsylvania orchards for the presence of streptomycin resistant Erwinia amylovora
Phytopathology, Laukaitis, Hanna, Peter, Kari, Lehman, Brian, Baer-Lehman, Marcie, 2016

Wrapping Up The 2016 Season: Disease Management For 2017
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Keeping Apples Clean: Managing Pre- and Postharvest Fruit Rots
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Just Peachy: 'Tis The Season For Brown Rot
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Tree Fruit Disease Update For the Season Mid-Point: What You Need To Know
Penn State Fruit Times Newsletter, Peter, Kari, 2016

MyIPM: New Smartphone Apps For Tree Fruit Disease Management
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Time For Vigilance: Tree Fruit Diseases Becoming More Obvious As Warm Temps Prevail
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Pome Fruit Fungicide Update: New Product Available and One Product Cancelled
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Predicting Infection Periods to Apply Protection
Penn State Fruit Times Newsletter, Peter, Kari, 2016

First Scab Spores Of The 2016 Season Detected--Time For Copper Sprays
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Evaluating fungal plant pathogens causing apple fruit rot pre- and postharvest to determine effective decay management strategies
Pennsylvania Fruit News, Peter, Kari, Lehman, Brian, Jurick, Wayne, 2016

Evaluating alternative fire blight management strategies
Pennsylvania Fruit News, Peter, Kari, McNellis, T, Lehman, Brian, Sinn, J, Klee, Sara, 2016

Fighting Fire Blight During Winter: Canker Management
Penn State Fruit Times Newsletter, Peter, Kari, 2016

Comparing oxytetracycline and copper for managing bacterial spot on peach and nectarine in Pennsylvania, 2014
Plant Disease Management Reports, Peter, Kari, Lehman, Brian, Bower, Carl, 2016

Evaluation of bactericide programs for the management of fire blight on 'Gala' apples in Pennsylvania, 2014
Plant Disease Management Reports, Peter, Kari, Lehman, Brian, Bower, Carl, 2016

Evaluation of conventional and alternative to manage blossom blight on ‘Gala’ appl es in Pennsylvania, 2015
Plant Disease Management Reports, Peter, Kari, Lehman, Brian, Bower, Carl, 2016

Evaluation of copper programs to manage bacterial spot on peach and nectarine in Pennsylvania, 2015
Plant Disease Management Reports, Peter, Kari, Lehman, Brian, Bower, Carl, 2016

Tetracycline resistance genes in epiphytic bacteria collected from Pennsylvania stone fruit orchards, Bardsley, Sarah, Peter, Kari, Ngugi, Henry, Jimenez-Gasco, Maria, 2016

Evaluation of alternative chemicals for bacterial spot management and mitigation of the risk of antibiotic resistance development in Pennsylvania stone fruit orchards
Pennsylvania Fruit News, Bardsley, S, Peter, K, Jiménez-Gasco, Maria, 2016

It’s easy to misdiagnose bacterial spot on peaches
American Fruit Grower, Peter, Kari, 2015

A thief in the blight: what can Erwinia amylovora bacteria steal from their host?
Phytopathology, Ramos, Laura, Sinn, Judy, Pfefufer, Emily, Peter, Kari, McNellis, T, 2015

Cleaning Up the 2015 Season: Disease Management Strategy Review
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Have Rots On Your Radar
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Using long-term research station data to assess and predict disease response to climate change.
IOBC Bulletin, Boudreau, Mark, Peter, Kari, Sutton, Turner, 2015

Apple Harvest Time: Managing Pre- and Postharvest Rot
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Fire blight management strategies
XVIII International Plant Protection Congress, Peter, Kari, Lehman, Brian, 2015

Peach And Nectarine: Discerning The Difference Between Bacterial Spot Disease And Coppery Injury Symptom
Penn State Fruit Times Newsletter, Peter, Kari, 2015

The Disease Season Continues: Brown Rot, Fire Blight, Root Rots
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Rots Wreaking Havoc On Stone Fruit (And So Is Bac Spot)
Penn State Fruit Times Newsletter, Peter, Kari, 2015

No rest for the weary: Keeping up with tree fruit diseases
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Wanted: Fire blight samples from Pennsylvania
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Erwinia amylovora pyrC mutant causes fire blight despite pyrimidine auxotrophy
Letters in Applied Microbiology, Ramos, L. S., Sinn, J. P., Lehman, B. L., Pfeufer, E. E., Peter, K. A., McNellis, T. W., 2015

Disease Update: The Latest About Apple Scab, Managing Diseases After Hail, And Gearing Up To Manage Summer Diseases
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Penn State Fruit Research & Extension Center: Grower Field Day & Barbecue Thursday, July 9, 2015, 1:00-7:30 p.m.
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Alert For Possible Apple Scab Infection This Weekend And The Latest About All Of Those Other Diseases You Should Be Worried About
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update for all PA and MD: Apple scab infection period predicted for April 30 – May 1
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Tree Fruit Diseases To Manage During The Month of May
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Scab infection period today and fire blight threat for areas in bloom in Maryland
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Time to face the music…
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Evaluation of bactericide programs for the management of fire blight on 'Gala' apples and bacterial spot on peach in Pennsylvania, 2014
Proceedings 90th Cumberland Shenandoah Fruit Workers Conference, Peter, Kari, Lehman, Brian, 2015

Preparing for the 2015 season: Learning from the 2014 fire blight epidemic
Penn State Fruit Times Newsletter, Peter, Kari, 2015

It’s That Time: Early Season Tree Fruit Disease Control for 2015
Penn State Fruit Times Newsletter, Peter, Kari, 2015

Disease Update: Growers scratching their heads over appearance of Nectria
Penn State Fruit Times Newsletter, Peter, Kari, 2015

The PSU TreeFruit Doctor is IN: Follow the latest with tree fruit disease information on Twitter @drtreefruit
Penn State Fruit Times Newsletter, Peter, Kari, 2015

First report of brown rot on apple fruit caused by Monilinia fructicola in Pennsylvania
Plant Disease, Peter, K. A., Gaskins, V. L., Lehman, B., Jurick, W. M., 2015

An Erwinia amylovora pyrC mutant is auxotrophic for pyrimidine yet causes fire blight in apple tree shoots and grows in immature pear and apple fruit tissue
Letters in Applied Microbiology, Ramos, Laura, Sinn, Judy, Lehman, Brian, Pfeufer, Emily, Peter, Kari, McNellis, T, 2015

Investigations into a novel gene pair that plays a role in fire blight disease development
Phytopathology, Klee, Sara, Lehman, Brian, Peter, Kari, McNellis, T, 2015

Bacterial diseases of stone fruit: spots and cankers
New England Fruit and Vegetable Fruit Conference Proceedings, Peter, Kari, 2015

Current studies on epidemiology and management of bacterial spot of stone fruit
Proceedings from the 2015 Great Lakes Fruit, Vegetable, and Farm Market Expo and Michigan Greenhouse Grower Expo, 2015

Evaluation of alternative chemicals for bacterial spot management and mitigation of the risk of antibiotic resistance development in Pennsylvania stone fruit orchards
Pennsylvania Fruit News, Bardsley, S, Peter, K, Jiménez-Gasco, Maria, 2015

Getting the upper hand on fire blight
New England Fruit and Vegetable Fruit Conference Proceedings, Peter, Kari, 2015

Host modification of Penicillium solitum during postharvest decay of apple fruit
IOBC-WPRS Bulletin, Peter, Kari, Park, Eunhee, Gaskins, Verneta, Yang, Tianbo, Janisiewicz, Wojciech, Jurick, Wayne, 2015

Evaluating fungal plant pathogens causing apple fruit rot pre- and postharvest to determine effective decay management strategies
Pennsylvania Fruit News, Peter, Kari, Jurick, Wayne, 2015

Exploration of induced tree immunity and copper as alternative fire blight management strategies
Pennsylvania Fruit News, McNellis, T, Peter, Kari, Klee, Sara, 2015

Putting the 2014 season to bed: Disease management continues
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Challenges: How monitoring for disease has changed, Peter, Kari, 2014

Controlling for those pesky fruit rots in time of apple harvest (and postharvest)
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Orchard IPM: Apple Scab Scouting
Penn State Extension website, Peter, Kari, 2014

Necrotic leaf blotch appearing on apples and the home stretch for controlling diseases stone fruit
Penn State Fruit Times Newsletter, Peter, Kari, 2014

2014 Season for Diseases: You Name It, It’s Out There
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Resources available: 1-800 PENN IPM hotline for tree fruit disease and insect updates
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: The latest about apple scab and more info for fire blight management
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: The Fire Blight Saga Continues
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Tips To Identify Bacterial Diseases
American Fruit Grower, Peter, Kari, Capasso, Sarah, 2014

The unrelenting spring weather conditions: party time for plant pathogens
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: Scab, Fire Blight, and Mildew Oh My!
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: Be on alert for fire blight conditions later this week
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: Apple Scab Alert April 29 – May 1, 2014
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: Apple Scab Infection Warning
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Disease Update: Get Your Motor Running…
Penn State Fruit Times Newsletter, Peter, Kari, 2014

A Glimpse Into The World Of Postharvest Disease Research
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Assessment of Cross-Resistance to Site-Specific Fungicides in Populations of Venturia inaequalis (scab fungus
Pennsylvania Fruit News, Peter, Kari, Halbrendt, Noemi, 2014

Development and application of a rapid dye-based method to determine pesticide resistance in pre- and postharvest tree fruit pathogens
Pennsylvania Fruit News, Peter, Kari, del Mar Jimenez Gasco, M, Jurick, Wayne, 2014

Impact of summer disease management on storage rot
Pennsylvania Fruit News, Peter, Kari, Halbrendt, Noemi, Schupp, J, 2014

Updated resource available for those with connections to apples and pears: Compendium of Apple and Pear Diseases and Pests, Second Edition (2014)
Penn State Fruit Times Newsletter, Peter, Kari, 2014

Mutation of the Erwinia amylovora argD gene causes arginine auxotrophy, nonpathogenicity in apples, and reduced virulence in pears
Applied and Environmental Microbiology, Ramos, Laura S., Lehman, Brian L., Peter, Kari A., McNellis, Timothy W., 2014

First report of penicillium crustosum causing blue mold on stored apple fruit in Serbia
Plant Disease, Vico, I., Gaskins, V., Duduk, N., Vasić, Miljan, Yu, J. J., Peter, K. A., Jurick, W. M., 2014

Yeasts associated with plums and their potential for controlling brown rot after harvest
Yeast, Janisiewicz, Wojciech J., Jurick, Wayne M., Peter, Kari A., Kurtzman, Cletus P., Buyer, Jeffrey S., 2014

Evaluation of fungicide programs to control apple diseases in Pennsylvania, 2013
Plant Disease Management Reports, Peter, Kari, Halbrendt, Noemi, Hollabaugh, James, Jarjour, Bashar, 2014