Fungicide "Cheat Sheet" for ALS and Head Rot in Broccoli and Other Cole Crops
Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

The 2024 updated Fungicide "Cheat Sheet" provides a list of fungicides (both conventional and organic) that are labeled in broccoli and other common Cole crops, for which Cornell research has shown to be effective for control of Alternaria leaf spot (ALS) and head rot. Many tips on how to build a successful fungicide program for ALS and downy mildew that adheres to best fungicide resistance management are included.
NOTE: Due to known development of ALS developing fungicide resistance to FRAC 7c, Cornell is not longer recommending FRAC 7 fungicides for managing ALS and head rot in brassicas.
==> Due to lack of funding, we were unable to continue our research on Alternaria leaf spot and head rot in broccoli in 2024 or 2025. Thus, our recommendations for control of this disease remain the same.
Fungicide Cheat Sheet for ALS and Head Rot in Broccoli & Other Cole Crops, 2024 (pdf; 348KB)

Upcoming Events
Small Vegetable Workshop
August 13, 2026
Fulton, NY
Identify vegetables that make sense to grow on small acreage, including under high and low tunnel season extension. Bill Ingersoll, owner of Ingersoll Farms, will provide a short tour and discuss other important factors of running a mixed vegetable farm, including a farm stand and selling at farmers' markets.
Chipping Potato and Field Crops Twilight Meeting
August 27, 2026
Dansville, NY
This year, our field meeting is bringing together field crops and chipping potatoes. SWNY Dairy, Livestock, and Field Crops Specialist Katelyn Miller will lead a field crops management discussion. Hear the latest updates in potato disease control and see the Cornell chipping potato variety trial run by Walter De Jong. Dinner follows the educational event.
1.5 DEC credits available in 10, 1a, 21, and 23.
IPM Field Day for Urban Growers
September 10, 2026
Buffalo, NY
Join us for a hands-on field day exploring integrated pest management and season extension tools for urban growing spaces and the opportunity to build community with local growers!
This event will focus on best practices for using row covers and rat mitigation. Check out our CCE demonstration trial using insect exclusion netting to manage swede midge, an invasive fly that causes damage to brassica crops. Explore how to identify rat activity, reduce attractants, and strengthen site management. Hear from local growers on how they manage pests with a focus on organic management and how they extend the season on their farms and gardens.