Leslie Holland, Assistant Professor & Extension Specialist in Fruit Crops Pathology, University of Wisconsin-Madison

  • Seminar: Cranberry Pathology in Wisconsin: Old Diseases, New Problems
  • 2021-09-20T15:35:00-04:00
  • 2021-09-20T16:30:00-04:00
  • Leslie Holland, Assistant Professor & Extension Specialist in Fruit Crops Pathology, University of Wisconsin-Madison

When September 20, 2021, 3:35 PM - 4:30 PM

Where Zoom

The large American cranberry (Vaccinium macrocarpon) is native to eastern North American and has been cultivated since the early nineteenth century. Wisconsin is the leading producer of cranberries in the world, contributing over 60% of the global supply. In contrast with other cranberry production states like Massachusetts and New Jersey, general disease pressure in Wisconsin marshes has remained low to moderate for many years. Cranberry fruit rot, a disease complex of 12+ fungi, was one of the most important diseases of cranberry since it’s cultivation, and today still represents a significant challenge for many growers in the eastern production regions of the U.S. and Canada. For decades, cranberry fruit rot incidence in Wisconsin rarely warranted fungicide use if cultural practices such as sanding, trash floods, and water management kept inoculum levels low. However, with increased plantings of newer hybrid varieties, growers are noticing a rise in cranberry fruit rot incidence. While fungicides do provide effective control, there are limited modes of action registered for fruit rot and those currently available are heavily relied upon each season. In more recent years, cranberry false blossom, a disease caused by a leafhopper-vectored phytoplasma has shown up in several Wisconsin marshes resulting in distorted flowers that do not bear fruit. After almost a century since false blossom devastated the industry and then seemingly disappeared with the use of insecticides and resistant varieties, it has re-emerged in Wisconsin. The Holland lab at UW is investigating the biology, dispersal, and management of these pathogens in cranberry production.