White Rot and Black Rot Biology and Management
Mike Basedow, Tree Fruit Specialist
Eastern New York Commercial Horticulture
The white rot fungus, Botryosphaeria dothidea, often referred to as "Bot rot" or Botryosphaeria rot, can be a distinct canker on twigs, limbs, and trunks. The fungus produces two types of fruit rot, but leaf infections do not occur. Drought stress and winter injury have been associated with an increase in infection and canker expansion. This is a relatively weak fungal pathogen, and is only problematic when a tree is stressed, such as due to drought, winter injury, insect damage, or fire blight.
The black rot and frogeye leaf spot fungus, Botryosphaeria obtusa, attacks fruit, leaves, and bark of apple trees and other pomaceous plants.
White Rot and Black Rot Biology and Management (pdf; 287KB)
Upcoming Events
What is my vine trying to tell me?
May 15, 2024 : What is my vine trying to tell me?
Plattsburgh, NY
Are your grapevines showing signs of discoloration or stunted growth? Don't ignore these warning signs! Join us on May 15th at the Clinton County CCE office to learn about the essential nutrients that grapevines require to thrive, identify the symptoms of nutrient deficiencies, and how to fix them. Don't miss out on this opportunity to improve your grapevine cultivation skills! Attendance is free, but registration is required.
How man's best friend can help find Spotted Lanternfly
May 21, 2024
Millbrook, NY
Come and join us at the Dutchess County CCE office on May 21st for a special demonstration by Jennifer Fimbel, the Agriculture and Horticulture Program Leader with Dutchess County CCE. You will get to see her SLF K9 Cole in action as they demonstrate how man's best friend can be used to detect the Spotted Lanternfly. Attendance is free, but registration is required
What is my vine trying to tell me?
May 22, 2024 : What is my vine trying to tell me?
Greenwich, NY
Are your grapevines showing signs of discoloration or stunted growth? Don't ignore these warning signs! Join us on May 22nd at the Washington County Fair Grounds to learn about the essential nutrients that grapevines require to thrive, identify the symptoms of nutrient deficiencies, and how to fix them. Don't miss out on this opportunity to improve your grapevine cultivation skills! Attendance is free, but registration is required.