Fire Blight Sampling
It is only possible to isolate the bacteria (Erwinia amylovora) from fresh, active lesions, where healthy tissue meets the diseased tissue - the lesion margin.
It is impossible to isolate fire blight bacteria from dead, dried out tissue.
The Lesion Margin
Collect samples that include about 3 inches of healthy tissue beyond the infected tissue, and include about 3 inches of infected tissue. Do not submit all the dead branch of the strike, this is often too long and can be cut back, as described, to 3 inches of infected tissue above 3 inches of healthy tissue.
If possible, refrigerate infected trees and strikes.
Protect samples from drying out prior to submitting them.
Do not collect entire branches or trees unless symptoms are unusual.
Please see the attached form for more information.
Fire Blight Sample Form (pdf; 226KB)
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Upcoming Events
2026 Champlain Valley Summer Orchard Field Tour
July 15, 2026 : 2026 Champlain Valley Summer Orchard Field Tour
Keeseville, NY
Join the ENYCHP and Cornell scientists on July 15 for our annual Champlain Valley Summer Orchard Meeting! This year we will be meeting at Hart Apple Farm to learn about the varieties they are growing in one of their newer plantings, hear updates from faculty and extension agents on their current research projects, and view a few of Mike's local thinning projects firsthand.
DEC credits in categories 22, 1A, and 10 will be available. Refreshments will be provided.
Free to attend, however we do ask that you register ahead so we know how many people to expect. Rain date is July 16.