Copper Fungicides for Organic Disease Management in Vegetables
From Margaret McGrath, Department of Plant Pathology and Plant-Microbe Biology, Cornell:
There are several different copper fungicides approved for use in organically-produced crops. Copper fungicides are important tools for managing diseases that cannot be effectively managed with cultural practices alone. They have broad-spectrum activity, acting on bacteria as well as fungi. Following many years of use, there is a lot more information on efficacy of copper fungicides than the newer biological products. Manufacturers of some biologicals recommend that they be used in a management program with copper fungicides (often in alternation or at low label rate). Thus it appears copper fungicides will continue to be important for managing diseases. Copper fungicides differ in their active ingredient, use rate, re-entry interval, and the amount of copper. Copper is an inorganic compound thus it does not breakdown like organic compounds and consequently copper can accumulate in soil when used intensively. Plants take up some copper from soil because it is a micronutrient. Similarly, humans need a small amount of copper in their diets. Metallic copper equivalent (MCE) is a commonly used measure of the quantity of copper in fungicides.
Click here for a chart on the Highest Label Rate of Organic Copper Fungicides for Some Vegetable Crops.
The specific directions on fungicide labels must be adhered to. They supersede these recommendations (above), if there is a conflict. Check state registration and organic approval before using a product. Any reference to commercial products, trade or brand names is for information only; no endorsement is intended.
Highest Label Rate of Organic Copper Fungicides for Some Vegetable Crops (pdf; 198KB)
Upcoming Events
2025 Finger Lakes Auction Winter Growers Meeting
January 2, 2025
Penn Yan, NY
At this grower-focused meeting, ag industry experts will discuss pest control in vegetables, weed management strategies and best practices, seed germination, an introduction to foliar nutrient uptake in vegetables, and grouping flowers by growth needs. Plus we'll hear from a grower panel from Kutztown Produce Auction, moderated with NYS specific pest control from Judson Reid.
2.25 DEC recertification credits will be offered in categories 10, 1a, 23, and 24.
2025 Ontario Produce Auction Winter Growers Meeting
January 15, 2025
Stanley, NY
This grower-focused meeting will include information about pesticide applicator recertification and record keeping requirements, disease control in cole crops and vine crops, and using biocontrols for insect management in greenhouses. Several seed and ag input companies will be on-hand to share product news.
2.75 DEC recertification credits will be offered in categories 10, 1a, 23 and 24. CORE credits (0.5) offered too!
Intro to Food Safety and GAPs Training
February 19, 2025
via Zoom,
This virtual workshop will serve two purposes:
- For produce farms just interested in learning about farm food safety, this program will introduce principles and best practices.
- For produce farms look for a GAPs (Good Agricultural Practices) training needed to meet buyer demands for audit/certification, this program will provide that as well.