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
ENY Orchard Soil Health and Beneficial Fungi Meeting
August 15, 2024 : ENY Orchard Soil Health and Beneficial Fungi Meeting
Peru, NY
Join the members of CCE ENYCHP and the Cornell Soil Health Program for a field meeting on the basics of soil health, the potential benefits of mycorrhizal fungi, and an update on the current project status of our SARE grant on orchard mycorrhizal products.
This meeting is intended for farmworkers, young and beginning orchardists, and experienced orchard managers wanting to learn about the basics of soil health and mycorrhizal fungi within the orchard.
North Point Community Farm Twilight Meeting
August 19, 2024 : North Point Community Farm Twilight Meeting
Plattsburgh, NY
North Point Community Farm Twilight Meeting
Monday, August 19th 4-7 pm (rain or shine)
2172 Military Turnpike, Plattsburgh, NY 12901
$10 per farm
Join us for a tour of North Point Community Farm, a diversified vegetable, berry, and flower operation in the North Country. Farmers Marisa and Mike will give us an overview of their decision-making as they expand their business, increasing their high tunnel production, investing in new tillage equipment, and transforming an old dairy barn into an efficient wash-pack shed with food safety in mind. We'll end the evening with local food refreshments and an opportunity to network with growers from NY and VT.
DEC credits: 1.5 credits in categories 1A, 10, 23
Late Summer Orchard Meeting
August 21, 2024
Fonda, NY
Join us for our last get together of the summer before we're in the thick of harvest. At this meeting, we will tour Sand Flats Orchard with manager Mitch Hoffman, and we will then discuss late season pest management tasks with our experts from the HVRL and Cornell AgriTech.
DEC Credits: 1.5 credits in categories 1A, 10, and 22.