Cornell Vegetable Program Enrollment

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  • Variety Evaluation
  • Market Development
  • Pest Management
  • Cultural Practices

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  • Educational Meetings & Conferences
  • In-Field Educational Opportunities
  • On-Farm Research Trials

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2022 Cornell Onion Fungicide Cheat Sheets for Control of Leaf Diseases

Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

July 5, 2022

This sheet 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.

The 2022 Onion Fungicide Cheat Sheet for Control of Leaf Diseases in New York includes active ingredients, FRAC codes, rating for risk of fungicide resistance, activity on downy mildew, and maximum use rates.

The 2022 Relative Performance of Fungicides Including Tank Mixes for Control of Botrytis Leaf Blight and Stemphylium Leaf Blight Cheat Sheet provides an easy-to-read ranking of the relative efficacy of the treatment options and their FRAC groups.



2022 Onion Fungicide Cheat Sheet for Control of Leaf Diseases in New York (pdf; 302KB)

2022 Performance of Fungicides Including Tank Mixes for Control of BLB and SLB (pdf; 276KB)

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Cucumbers

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Dry Beans

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Eggplant

Eggplant

Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

Mushrooms

Mushrooms

Onions

Onions

Parsnips

Parsnips

Peas

Peas

Peppers

Peppers

Potatoes

Potatoes

Pumpkins / Gourds

Pumpkins / Gourds

Radishes

Radishes

Rhubarb

Rhubarb

Rutabaga

Rutabaga

Snap Beans

Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

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Sweet Corn

Sweet Corn

Sweet Potatoes

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Tomatoes

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Turnips

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more crops
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Upcoming Events

2026 NYS Processing Vegetable Educational Meeting

Event Offers DEC Credits

March 16, 2026
Batavia, NY

Processing vegetable industry members who grow, manage, or support crop production for Farm Fresh First/Nortera Foods, Seneca Foods and/or Love Beets, are encouraged to sign-up for the 2026 NYS Processing Vegetable Industry Meeting! You will:

  • Network at this in-person meeting.
  • Learn the results of industry-funded research.
  • Have a voice in Cornell research and Extension.

DEC recertification credits available: 2.0 in categories 1a, 10, and 23.

2.0 Certified Crop Advisor (CCA) credits available.

View 2026 NYS Processing Vegetable Educational Meeting Details

Virtual Asparagus School

Event Offers DEC Credits

March 17, 2026

Join us to dive deep on growing asparagus! Bringing together experts from the Cornell Vegetable Program, Michigan State University, OMAFA (Ontario Ministry of Agriculture, Food, and Agribusiness), and industry, featuring a panel of growers. 

View Virtual Asparagus School Details

Postharvest Water Management, Sanitation, and Traceability Workshop

Event Offers DEC Credits

March 18, 2026
Albion, NY

Cornell University personnel from the National GAPs Program and the Produce Safety Alliance are presenting a workshop on postharvest water management, sanitation, and traceability. This workshop will include a mix of short talks and hands-on activities to provide attendees with applied experience with sanitation, postharvest water, and traceability topics. 

2.75 NYSDEC CEU's in categories 10, 1a, and 23 available.

View Postharvest Water Management, Sanitation, and Traceability Workshop Details

Announcements

2025 Year in Review

Our 2025 Year in Review and 2026 Preview report highlights some of the many research and educational programs led by our team in 2025. Plus, we provide a sneak peek at some of our plans for 2026!
  • Integrating Laser Weeders into Muck Onion Production
  • Cornell Vegetable Program Advances Cover Crop Research
  • New, Interactive Pesticide Safety Programming Protects Farmer Health
  • Specialty Potato Variety Trial Tests Varieties During a Hot Growing Season
  • Mushroom Enthusiasm Grows
  • Equipping Sweet Corn Growers for an Emerging Disease: Tar Spot
  • Farm Food Safety Educational Outreach
  • Sustainable Pest Management for New York Urban Farmers
  • In 2026...


Cornell Crop and Pest Management Guidelines Paused

From Cornell IPM:

Highlighting its commitment to quality and long-term sustainability, Cornell Integrated Pest Management's Pesticide Safety Education Program has announced a pause in production of the 2026 Cornell Crop and Pest Management Guidelines.

Cornell IPM Director Alejandro Calixto said this temporary measure is the result of a comprehensive reimagining process facilitated by Illume Projects of Ithaca, which included end-user interviews, internal surveys and sales data analytics.

"It became clear to us that we cannot continue producing the guidelines and fully restructure them at the same time," Calixto said. "By pausing production, we can dedicate all available resources and time to rebuilding the production process, ensuring that when we re-launch in 2027, the guidelines will reflect a modernized approach built around the grower and other user experience."

A series of annually updated reference manuals produced by Cornell IPM and the College of Agriculture and Life Sciences (CALS), the Cornell Crop and Pest Management Guidelines are widely used by farmers, agronomists, crop consultants and extension educators in New York and throughout the Northeast. They include information about current IPM recommendations, pesticide options, cultural practices, nutrient management, disease, insect and weed identification and resistance-management strategies.

Calixto and Pesticide Safety Education Program Lead Mike Helms will spearhead efforts to restructure the guideline process over the next 12 months, with a goal of launching a more streamlined, user-friendly version in 2027.

Limited copies of the 2025 guidelines remain available for purchase while supplies last through The Cornell Store. The 2026-2027 Greenhouse Guidelines will be available.

For more information contact Helms at mjh14@cornell.edu.


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