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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

    Pickle Variety Twilight Meeting

    September 26, 2017
    5:30 PM - 7:30 PM
    Ransomville, NY

    2018 Empire State Producers EXPO

    Event Offers DEC Credits

    January 16 - January 18, 2018
    Morning, Mid-day, and Afternoon Sessions
    Syracuse, 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

    CANCELLED: Good Agricultural Practices (GAPs) / Harmonized GAPs Farm Food Safety Training

    September 26 - September 27, 2017
    9:30 AM - 4:00 PM
    Salamanca, NY

    This event has been cancelled due to low registration numbers. Farm food safety is common-sense practices organized to assist farmers to improve their skill set to continue to grow safe and healthy food.

    Day One of this training will be an educational training on farm food safety principles and practices to provide the background and information for farmers to understand how to minimize the risk of food born disease contamination. Day Two will be for those who want help with writing a farm food safety plan.
    view details

    Pickle Variety Twilight Meeting

    September 26, 2017
    5:30 PM - 7:30 PM
    Ransomville, NY

    Vegetable growers are invited to tour an on-farm plot of early generation Cornell downy mildew resistant pickle breeding lines. Dr. Michael Mazourek, Professor of Plant Breeding, and lab members, will be on site to walk growers through the plot and review plant selections. All growers that attend will be an integral part of helping make selections for the next generation of pickle varieties released!
    view details

    Season Extension - Stretching Tomato Season and Winter Greens

    October 4, 2017
    4:00 PM - 7:00 PM
    Allegany, NY

    What do you need to do to stretch out your high tunnel tomato season or establish a profitable crop of winter greens? Meeting the full season's nutritional demands of tomatoes under organic management is challenging. Juggling diverse succession crops and keeping the tunnel profitable year round adds an extra level of difficulty. 
    view details
    view calendar of events

    Announcements

    Produce Donations for Hurricane Relief

    The ENY Commercial Horticulture Program is leading an effort to collect pallets of produce to send down to TX and FL for hurricane relief. Feeding American is handling the transportation. "Hard" crops accepted:
    • apples
    • onions
    • cabbage
    • potatoes
    • winter squash
    • any other crop that withstand no refrigeration for a week
    Farms donating product will receive a record of donation. Dates and locations of drop off locations in our region and across the state are provided. 

    You must be prepared to contact them in advance with details on what crop you are donating, how many pallets, which location you will be dropping your donation off at, and when they can anticipate your products. For more information on this effort and updates on locations, visit the ENY Commercial Horticulture's event details.


    Empire State Producers EXPO Proceedings Available

    Proceedings from the Empire State Producers EXPO conference from 2011-2017 are available online.

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