2026 Onion Fungicide Cheat Sheet for Control of Leaf Diseases
Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program
The 2026 Cornell Onion (Dry Bulb) Fungicide "Cheat Sheet" for Control of Leaf Diseases in New York provides relative performance rankings for Botrytis leaf blight and Stemphylium leaf blight of the main fungicide options that may be used in New York to control these diseases, based on recent on-farm fungicide trial results, which reflect reduced efficacy of SLB due to development of fungicide resistance. It includes active ingredients, FRAC codes, rating for risk of fungicide resistance, activity on downy mildew, maximum use rates, and photos.
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Upcoming Events
Champlain Valley Orchard Storage Meeting
August 26, 2026
Chazy, NY
Join various experts from Cornell and Cooperative Extension at an orchard storage meeting for the Champlain Valley in Chazy from 1 to 4PM on August 26th. Free to attend, however we do ask that you register ahead so we know how many people to expect.