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Pests

PestsNumerous pests affect commercial vegetable production in New York. All stages of plant growth may be susceptible to insects or disease causing pathogens which may result in poor seedling emergence, reduced yields and quality issues. Similarly, weeds compete with vegetable crops for light, nutrients and water often reducing yields. Weeds can also act as a reservoir for insects and diseases. Furthermore, weed seeds and other parts can be a contaminant of certain vegetable crops.

Cornell Vegetable Program Specialists conduct research and educational programs on many important insects, diseases and weeds in New York. While not an exhaustive list, current information on many important vegetable pests can be found below. The most recent pest content is listed below but you can find more pests under the pest categories of Diseases, Insects, and Weeds.

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    Relevant Events

    Muck Donut Hour Every Tuesday

    August 1, 2017
    8:30 - 9:30 AM
    Elba, NY

    2017 Vegetable Pest and Cultural Management Field Meeting - Chautauqua County

    Event Offers DEC Credits

    August 8, 2017
    6:00 PM
    Frewsburg, NY

    Muck Donut Hour Every Tuesday

    August 8, 2017
    8:30 - 9:30 AM
    Elba, NY

    Integrated Pest Management in High Tunnels

    August 10, 2017
    1:00 PM
    Gainesville, NY

    Muck Donut Hour Every Tuesday

    August 15, 2017
    8:30 - 9:30 AM
    Elba, NY

    Most Recent Pests Content

    Video: Downy Mildew

    Angela Parr, Administrative & Communications Lead
    Cornell Vegetable Program

    Last Modified: July 6, 2017
    Video: Downy Mildew

    Downy mildew is a potentially devastating disease to cucurbits. It usually affects cucumbers and cantaloupes first; later in the season it can be found on summer squash and zucchini. During some seasons, downy mildew can spread to winter squash and watermelons. Growers need to be monitoring their fields. This short video shows the different stages of the disease and possible outcomes if it is not controlled.

    2017 Cucurbit Downy Mildew Management Guidelines

    Last Modified: July 5, 2017
    2017 Cucurbit Downy Mildew Management Guidelines

    From Margaret McGrath, Cornell
    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.

    Cornell Onion Fungicide "Cheat Sheet" for Leaf Diseases, 2017

    Christy Hoepting, Extension Vegetable Specialist
    Cornell Vegetable Program

    Last Modified: July 5, 2017
    Cornell Onion Fungicide

    This chart provides information on fungicides available for use in New York in 2017 in onions for control of leaf diseases including Botrytis Leaf Blight (BLB), Purple Blotch (PB), Stemphylium Leaf Blight (SLB), and Downy Mildew (DM). This year, more fungicides and detailed efficacy ratings are provided per BLB, SLB, and DM from Cornell trials. Rotation restrictions and maximum allowable per season are provided. 


    More Pests Content

    Video: Swede Midge
    Video: Flea Beetles
    Help Us Define and Measure IPM Adoption and Practices in NY Vegetables: SURVEY
    2016 Weed Research in Vegetable Crops, Cornell University
    NEW! Pesticide Product Search Online
    White Rot Fact Sheet for Garlic
    Garlic Bloat Nematode Testing Services for 2016
    Northern Corn Leaf Blight in Sweet Corn
    2015 Stemphylium Leaf Blight Fungicide Trial Summary
    The Magnitude and Distribution of Western Bean Cutworm: The Risk to Dry Bean
    Scouting for Onion Thrips
    How to Sign the Waiver for the Indemnified Dual Magnum Label
    2015 Herbicides for Weed Control in Snap and Dry Beans
    Bacterial Blackleg - An Increasing Problem for Potato Growers
    Pesticide Options for Pests of Potato in New York, 2016
    2016 Beet Herbicide Chart
    Leaf Mold in High Tunnel Tomatoes 2015
    » View Complete List of Pests Content
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    Upcoming Events

    Muck Donut Hour Every Tuesday

    August 1, 2017
    8:30 - 9:30 AM
    Elba, NY

    Meet with Cornell Vegetable Program Specialist Christy Hoepting every Tuesday morning to ask questions and share your observations.
    view details

    Fresh Market Minutes - Eden Valley

    August 1, 2017
    9:00 AM - 10:00 AM
    Eden, NY

    Meet with the Cornell Vegetable Program Specialist Darcy Telenko every other Tuesday morning to ask questions and share your observations in fresh market vegetables.
    view details

    2017 Vegetable Pest and Cultural Management Field Meeting - Chautauqua County

    Event Offers DEC Credits

    August 8, 2017
    6:00 PM
    Frewsburg, NY

    This course will demonstrate pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables; primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options such as inter-row cover crops, grafting and where appropriate, spray options will be used to educate growers. CVP Specialists Judson Reid, DarcyTelenko, and Robert Hadad will instruct participants and facilitate peer-based learning. Details on each topic will focus on field observations at the farm. 
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    Announcements

    Late Blight Spreading Across WNY Counties

    7/19/17 - Late blight (LB) was confirmed in Livingston County on potato this week (the genotype is still being determined). The sample from Erie County from last week was determined to be US-23 which is sensitive to metalaxyl. All of Western NY is at risk for Late Blight infection. Severity values continue build at all stations. The frequent and continuing rainfall has been extremely favorable for the development of LB. Scout fields twice a week. All tomato and potato growers, conventional and organic, should be applying a protectant fungicides and monitoring the DSS to determine spray intervals. Remember to rotate fungicide FRAC groups and use contact fungicides in your program to minimize the chances of fungicides resistance.

    If late blight is suspected act immediately! Under favorable environmental conditions late blight develops very rapidly and can spread many miles in a short period. Please take a sample for isolate identification. It is very important to track disease movement. Contact CCE Cornell Vegetable Program Specialists for assistance.

    Cucurbit Downy Mildew Confirmed in WNY

    Cucurbit downy mildew has been confirmed in Erie County. There have also been confirmed reports from OH, PA and Ontario Canada. If you're planning on spraying cucumbers to control downy mildew, now is the time to do it!

    Characteristic disease symptoms are angular, pale green areas bounded by the leaf veins. They will turn yellow and later necrotic. Under high humidity conditions sporulation will occur on the lower leaf surface. Apply targeted fungicides tank-mixed with protectant fungicides weekly and alternated among available modes of action (FRAC code), starting when there is risk for a specific crop based on forecasting program. Refer to the Cornell Vegetable Guidelines for a complete list of products available.

    For more information about the disease, watch our new video Better Know a Pest: Downy Mildew or contact Robert Hadad or Darcy Telenko.

    Better Know a Pest Video Series

    The CCE Cornell Vegetable Program has created 3 new, short videos about common vegetable pests: flea beetlesswede midge, and downy mildew. The videos are part of a series called Better Know a Pest. Watch for more videos as the season progresses.

    2017 Cornell Vegetable Guidelines Available

    The 2017 edition of the Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production is now available. This annual publication provides up-to-date vegetable crop production information for New York State. It is designed as a practical guide for vegetable crop producers, crop consultants, ag chemical dealers, and others who advise vegetable crop producers.

    In addition to the annually revised pesticide and crop production information, highlighted changes in this edition of the
    Vegetable Guidelines include:
    • Addition of Dickeya blackleg on potato as a disease of concern.
    • Updated regulatory considerations for organic vegetable production.
    • Revised European corn borer management strategies for beans and potatoes.
    The Cornell Guidelines are available as a print copy ($41 plus shipping), online-only access ($41), or a package that combines print and online access ($57.50 plus shipping). Cornell Guidelines can be purchased through your local Cornell Cooperative Extension office or from the Cornell Store at Cornell University. To order from the Cornell Store, call (844) 688-7620 or order online.

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