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Copper Fungicides for Organic Disease Management in Vegetables

September 16, 2013

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)

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How to Take a Photo for Crop Diagnostics

With the current push to work remotely, using pictures to quickly address production questions has a lot of appeal and utility but the images must be of high quality.

In How to Take a Photo for Crop Diagnostics, readers will learn:
  • What makes a high quality image?
  • Things you should know
  • Different problems need different images
  • Steps for taking a high quality image
  • Pro tips
...Plus there a several side-by-side comparisons of poor quality photos versus high quality images with tips on what changes the photographer made to take the better photo. 

Cornell Commercial Vegetable Guidelines Available

The 2020 Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production are now available!

Written by Cornell University specialists, this publication is designed to offer producers, seed and chemical dealers, and crop consultants practical information on growing and managing vegetable crops in New York State. Topics include general culture, nutrient management, transplant production, postharvest handling, organic production, and managing common vegetable crop pest concerns. A preview of the Vegetable Guidelines can be seen online.

Highlighted changes in the 2020 Vegetable Guidelines include: 
  • Updated pesticide options for economically important vegetable crop pests.
  • Completely revised weed management chapter.
  • Updated online crop and pest management resources.
Cornell Crop and Pest Management Guidelines are available as a print copy ($41), online-only access ($41), or a package combining print and online access ($57.50). Shipping charges will be added to your order. Cornell Guidelines can be obtained through many local Cornell Cooperative Extension offices, or from The Cornell Store at Cornell University or call (844) 688-7620.


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