Pesticide Use

Neonicotinoids

Note: The 2015-2016 New England Greenhouse Floriculture Guide will contain a new section “Protecting Bees and Pollinators from Pesticides”. Contributors to the new section are Dr. Richard Cowles, The Connecticut Agricultural Experiment Station, Dr. Raymond Cloyd, Kansas State University, Dr. Kimberly Stoner, The Connecticut Agricultural Experiment Station, Dr. Lois Berg Stack, University of Maine and me. The new guide will be available November 5&6 at the Northeast Greenhouse Conference.   Tina

Pesticide Phytotoxicity

Pesticide phytotoxicity can often be distinguished from pest problems by the pattern and timing of symptom development. Although the damage may take up to several days or more to occur, pesticide damage symptoms often occur all at once and often have a regular distribution on the crop. Symptoms caused by pathogens usually develop over an extended period of time in random or grouped patterns. Pesticide phytotoxicity can be expressed by a number of different symptoms, including leaf speckling, cupping and twisting and other leaf distortions or even plant death.

Pesticide Use Tips

As you gear up for the growing season, be sure to carefully read pesticide labels before purchasing a new product. Some products with different trade names have the same active ingredients. Some products may have different active ingredients, but have the same mode of action (MOA). Growers will see more generic products on the market as pesticides come off patent, which can make choosing pesticides very confusing. There are now many different products containing imidacloprid, abamectin, bifenthrin, permethrin, chlorothalonil and thiophanate methyl.

Avoiding Pesticide Phytotoxicity on Spring Crops

Pesticide phytotoxicity on plants can often be distinguished from pest problems by the pattern and timing of symptom development. Although the damage may take up to several days or more to occur, pesticide damage symptoms often occur all at once and have a regular distribution on the crop. Symptoms caused by pathogens usually develop over an extended period of time in random or grouped patterns. Pesticide phytotoxicity can be expressed by a number of different symptoms, including leaf speckling, cupping and twisting and other leaf distortions or plant death.

Western Flower Thrips Update

Thrips are active in many greenhouses now. If you use pesticides to manage thrips then plan to treat in the early evening. (Note: If using oil based materials, they ar best applied in the morning to allow time for mixtures to dry before nightfall.) Thrips have two mass flights per day, in the morning and evening, so sprays in the early evening may contact more thrips. Treating before you see a peak in adult numbers on yellow sticky cards is critical. Adult thrips numbers on cards tend to peak every two to three weeks.

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