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2017 Cucurbit Downy Mildew Management Guidelines

Last Modified: July 5, 2017

2017 Cucurbit Downy Mildew Management Guidelines
From Margaret McGrath, Plant-Microbe Biology Section, SIPS, Cornell University
Producing a high-quality cucurbit crop necessitates effectively managing downy mildew. This foliar disease is common in the northeast because the pathogen produces a large quantity of asexual spores that are easily dispersed long distances by wind, which enables it to spread widely. There has been no evidence that the pathogen is surviving between growing seasons where winter temperatures kill cucurbit crops (outdoors above the 30th latitude); however, recently both mating types have been found, albeit typically on different cucurbit crop types, thus there is the potential for the pathogen to produce oospores (sexual spores) that could enable the pathogen to survive in northern areas of the USA. The downy mildew forecasting program has documented based on downy mildew occurrence movement of the pathogen throughout the eastern USA each year via its wind-dispersed asexual spores. The pathogen does not affect fruit directly; however, affected leaves die prematurely which results in fewer fruit and/or fruit of low quality (poor flavor, sunscald, poor storability).

The most important component of an effective management program for downy mildew is an effective, properly-timed fungicide program. And the key to that is applying mobile fungicides targeted to the pathogen starting when there is a risk of the pathogen being present. Mobile (or translaminar) fungicides are needed for control on the underside of leaves. Each year there often are changes to the fungicides recommended as the pathogen develops resistance or new products are registered. Because these fungicides have targeted activity, additional fungicides must be added to the program when there is a need to manage other diseases such as powdery mildew. Most targeted fungicides effective for downy mildew are also effective for Phytophthora blight.

The links below contain more information on resistant varieties, developing a diversified fungicide program and timing your sprays, and recommended targeted and protectant fungicides.

Additionally, you will find information for organic management of cucurbit diseases 
through biopesticides and fungicides for vegetable crops and herbs.

Effectively Managing Cucurbit Downy Mildew in NY in 2017 (pdf; 175KB)

Biopesticides for Managing Diseases of Cucurbits Organically (pdf; 214KB)

Efficacy of Organic Fungicides for Vegetable Diseases and Herbs (pdf; 158KB)

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Ethnic Vegetables

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Upcoming Events

2018 Annual Elba Muck Onion Twilight Meeting Featuring Herbicide Trial Tours

Event Offers DEC Credits

June 21, 2018
5:30 PM dinner, 6:00 - 8:30 PM program and tours
Elba, NY

All onion growers are invited to this event which will feature trial tours and demonstrations of pre- and post-emergent weed control in direct seeded onions. 2.0 DEC recertification credits and CCA credits will be available.
view calendar of events

Announcements

2018 NY Produce Auction Locations and Contact Info

Produce auctions in New York State have been formed so that produce growers have a way of marketing their product to quality minded buyers through open competitive bidding. Six of the eight produce auctions in NYS are in WNY! A map of produce auction locations across the state is provided along with auction days, times, and contact information.

Unsure how to purchase at a produce auction? The updated How To guide will give you some quick pointers on the auction terminology and how to make purchases at an auction.

Vegetable Sizing Templates Available

To assist farmers looking to sell into wholesale markets, vegetable sizing templates are now available for bell peppers, broccoli, Brussels sprouts, cauliflower, cucumbers, eggplant, potatoes, tomatoes, zucchini and summer squash. The crop templates are scaled to size (8.5 x 11 paper). They can be printed and used to create sizing templates to be used by workers on the wash and pack lines. Additional grading resources are available too.

Cornell Commercial Vegetable Guidelines Available

The 2018 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 2018 Vegetable Guidelines include:
  • Updated pesticide options for economically important vegetable crop pests.
  • Significantly revised pest management practices.
  • New onion and sweet corn IPM scouting report forms.
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 your local Cornell Cooperative Extension office, or from the Cornell Store at Cornell University or call (844) 688-7620.

Empire State Producers EXPO Proceedings

Proceedings from the Empire State Producers EXPO conference from 2011-2018 are available online.

Cornell Vegetable Program - Cornell Cooperative Extension
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