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Q&A ViewAttendees 1

Plant-Insect Ecosystems

10-Minute Paper

P-IE: IPM - Field Crops

Determining residual activity of commonly used insecticides in mid-southern soybean production systems

Tuesday, November 2, 2021
4:18 PM – 4:30 PM MT
Location: Colorado Convention Center, Meeting Room 102-106
In-Person

    Presenting Author(s)

  • JS

    Jacob Smith

    Graduate Research Assistant
    Mississippi State University
    Indianola, Mississippi

    • Co-Author(s)

  • WC

    Whitney Crow

    Mississippi State University
    Cleveland, Mississippi

  • AC

    Angus Catchot

    Mississippi State University
    Mississippi State, Mississippi

  • JG

    Jeff Gore

    Mississippi State University Delta Research and Extension Center
    Stoneville, Mississippi

  • DC

    Don Cook

    Mississippi State University
    Stoneville, Mississippi

Several insect pests cause economic loss in midsouth-grown soybeans every year. Chemical control is a critical tool in integrated pest management. In 2020, Mississippi growers averaged 2.3 foliar applications of insecticides in soybean (Musser et al. 2020). Residual efficacy of foliar insecticides can be highly variable and difficult to quantify due to several factors such as application method, coverage, pest pressure, degradation and rain fastness.
In 2020 and 2021, at the Delta Research and Extension Center in Stoneville, MS, foliar insecticide residual activity trials were conducted. Five commonly used insecticides were applied to soybean via a tractor-mounted sprayer. Leaves, flowerets, and pods were removed from the field up to 28 days after the initial application. Samples were bagged and analyzed for concentrations of active ingredient in the differing plant structures by the Mississippi State University (MSU) Chemical Laboratory. Concentrations received from the MSU Chemical Lab were used for insecticide diet-incorporated and soybean leaf bioassays to determine efficacy of the diamide insecticide chlorantraniliprole.