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
Fungi, Forage & Forest
June 12, 2026 : Friday Evening
Buckets, Beds & Totems
Explore mushroom cultivation techniques featuring oyster mushrooms, wine caps, and lion's mane mushrooms.
June 13, 2026 : Saturday Full-Day
Wild Edibles
Learn about edible plants and responsible foraging practices focused on plants only (no wild mushroom foraging).
Agroforestry Talk
Discover how agroforestry systems can support farm diversification and sustainable land management.
Shiitake Inoculation (hands-on workshop at Heartland Organics)
Participate in a hands-on shiitake inoculation workshop and learn the basics of log-grown mushroom production.
2026 Muck Onion Growers Twilight Meeting in Oswego
June 18, 2026
Oswego, NY
Open to all Onion Enthusiasts, the Muck Onion Growers Twilight Meeting will include an onion disease research update from 2025, new fungicide recommendations for 2026, an onion maggot seed treatment update, herbicide demonstration tour, and more. This educational event is immediately followed by a catered dinner; both are FREE thanks to generous sponsors!
2.25 DEC recertification credits available in categories 1a, 10 and 23. CCA credits will be offered too.