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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

    2017 Processing Vegetable Crops Advisory Meeting

    Event Offers DEC Credits

    December 13, 2017
    9:30 AM - 2:30 PM
    Batavia, NY

    2018 Empire State Producers EXPO

    Event Offers DEC Credits

    January 16 - January 18, 2018
    1.25 hr sessions throughout each day
    Syracuse, NY

    2018 Western NY Fresh Market Winter Vegetable Meeting

    Event Offers DEC Credits

    January 31, 2018
    8:00 AM registration, 8:30 AM - 3:30 PM program
    Lockport, NY

    2018 Western NY Fresh Market Winter Vegetable Meeting (Eastern location)

    Event Offers DEC Credits

    February 1, 2018
    8:00 AM registration, 8:30 AM - 3:30 PM program
    Irondequoit, NY

    Most Recent Pests Content

    Video: Downy Mildew

    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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    view calendar of events

    Upcoming Events

    NY Veterans in Agriculture Summit

    November 29, 2017
    8:30 AM - 4:30 PM
    Syracuse, NY

    Come gather for a day of education and networking. Learn about resources that are available to farmer veterans in New York and participate in educational sessions on topics including animal health, financial management, high tunnels, and business planning. 
    view details

    Second Annual Cut Flower Conference

    December 1, 2017
    8:00 AM - 4:00 PM
    Rensselaerville, NY

    Cornell Cooperative Extension's Capital Area Agriculture and Horticulture Program, announces their upcoming Second Annual Cut Flower Conference. The initial Cut Flower Conference, held in 2016, was very popular with established and beginning cut flower growers and growers considering adding cut flowers to their diversified farms.
    view details

    2017 Processing Vegetable Crops Advisory Meeting

    Event Offers DEC Credits

    December 13, 2017
    9:30 AM - 2:30 PM
    Batavia, NY

    All processing vegetable growers and industry members are invited to attend. Discuss the 2017 growing season and management concerns. Reports and discussion of the 2017 Projects funded by the New York Vegetable Research Council/Association. Review priorities and the role of the advisory group in applications for state and federal grants. Give your input on the format of future advisory meetings and future educational programs. 
    view details
    view calendar of events

    Announcements

    Available: 2017 Certified Seed Potato Directory

    The 2017 NYS Certified Seed Potato Crop Directory is now available. There is a wealth of information on NYS potato seed certification, as well as on the varieties grown for certification in 2017. The varieties include standards for processing and tablestock, newer varieties and numbered lines, and specialty/heirloom varieties. Brief summaries of the varieties' maturity, appearance, yield potential, and major disease susceptibility are included. Contact info for the growers with seed supplies of each variety is included. There is also a listing of the inspectors from the NYS Department of Agriculture and Markets in Albany and Syracuse.

    Growing for Wholesale Guidelines Available

    Grading and packing guidelines are now available for 16 commonly grown specialty crops in NYS: broccoli crowns, Brussels sprouts, corn, green peppers, cucumbers, green cabbage, red cabbage, savory cabbage, cauliflower, eggplant, green beans, jalapenos, poblanos, Hungarian hot peppers, summer squash, and zucchini.

    Acceptable quality standards and common defects that should be sorted out on the grading line are depicted in these resources, both visually and in outline form. Find all of the grading sheets here.

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