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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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Upcoming Events

Chautauqua Winter Vegetable Meeting

Event Offers DEC Credits

February 10, 2023
Clymer, NY

Meeting will feature growers from Ohio sharing their production know-how and thoughts on food safety. Other topics include weed control, pesticide safety, and the impact of poor crop nutrition. 0.75 DEC credits in 1a, 23 plus 0.5 in CORE, which is good for all categories. Trade show booths available. 

Meeting cost is $20/person, includes snacks and educational materials. Registration required by 4 pm on Friday, February 3. 

Orleans Regional Vegetable Meeting

Event Offers DEC Credits

February 15, 2023
Albion, NY

Offering presentations in pesticide safety, tips for managing diseases in vegetable crops, how to attract beneficial insects to your field, herbicide options for cole crops, and strawberry disease information. Meeting cost is $10 per person, payable at the door via cash or check. Pre-registration requested by 5:00 pm on Monday, February 13.

DEC credits available: 2.25 in 1a and 10; 2.0 in 23; 1.5 in 22; and 0.5 in CORE (used in all categories)!!

NYS Processing Vegetable Industry Roundtable Meeting

Event Offers DEC Credits

March 15, 2023 : Morning Session: Snap Beans, Sweet Corn, and Peas
Batavia, NY

Processing vegetable industry members who grow, manage, or support snap bean, sweet corn, or pea production for Nortera and/or Seneca Foods, should attend this session of the roundtable meeting. You will:

  • Network at this in-person meeting.
  • Learn the results of industry-funded research.
  • Have a voice in Cornell research and extension.
  • Earn 2.0 DEC credits in categories 1a, 10, 23 and CCA recertification credits.

This FREE event is followed by lunch! Pre-registration requested.


March 15, 2023 : Lunch Break and Networking

Lunch is FREE to anyone attending either the Morning Session or the Afternoon Session of the NYS Processing Vegetable Industry Roundtable Meeting. Registration is required.


Event Offers DEC Credits

March 15, 2023 : Afternoon Session: Beets and Carrots
Batavia, NY

Processing vegetable industry members who grow, manage, or support beet or carrot production for Nortera, Seneca Foods and/or Love Beets, should attend this session of the roundtable meeting. You will:

  • Network at this in-person meeting.
  • Learn the results of industry-funded research.
  • Have a voice in Cornell research and extension.
  • Earn 2.0 DEC credits in categories 1a, 10, 23 and CCA recertification credits.

Lunch is provided before this session. It's FREE! Pre-registration requested. 

Announcements

2022 Year in Review Released

Our 2022 Year in Review report highlights some of our 2022 projects and community outreach efforts impacting commercial vegetable, greenhouse, potato, and dry bean producers in 14 counties of western and central New York, and beyond.
  • Education and Technical Assistance Provided to Providence Farm Collective
  • Engineering Improvements in Biodegradable Mulch
  • Perseverance Leads to Solution for Perennial Sowthistle in Onion
  • Potato Programming Spans Farms of All Sizes
  • Improving Winter High Tunnel Soil Nitrogen Management
  • Laser Scarecrows Tested on Local Farms
  • New York Vegetable Industry Support
Cornell Cooperative Extension is Your Trusted Source for Research-Based Knowledge!

Small-Scale Fresh Mkt Potato Variety Trial Results

This year, the Cornell Vegetable Program planted a potato variety trial focused on commercially available fresh market potato varieties, with the small-scale potato grower in mind. This trial allowed us to test different varieties of potatoes that might be of interest to consumers at farm markets and see how well they perform in a western NY climate. 

We've posted a brief overview of our results on the Potato page.

If you would like the full report (PDF with photos and yield data) emailed to you, email Margie Lund.

New Ag Climate Factsheet Released

The intersection of agricultural production and greenhouse gases is gathering increasing attention. This is an opportune time to consider how vegetable production interacts with carbon sequestration and greenhouse gas emissions, and how using cover crops may alter this picture.

The factsheet, Greenhouse Gases and Soil Organic Carbon in Vegetable Production and the Role of Cover Crops, written by Zach Spangler, Ag Climate Resiliency Specialist with CCE Harvest NY, and Elizabeth Buck, Fresh Market Vegetable Specialist, CCE Cornell Vegetable Program, discusses:
  • Sequestration of atmospheric carbon in agricultural soils as soil organic carbon (SOC). Is vegetable production impacting SOC?
  • Net greenhouse gas emissions of carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4) from the soil.
  • Impact of cover crops on soil organic carbon, nitrous oxide emissions, and other GHG emissions.