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10-Minute Paper

Plant-Insect Ecosystems

P-IE: IPM - Field Crops 2

Western tarnished plant bug (Lygus hesperus) insecticide trials in California safflower

Sunday, November 5, 2023
10:12 AM – 10:24 AM ET
Location: Gaylord National Resort & Convention Center, National Harbor 7
In-Person

    Presenting Author(s)

  • Benjamin Halleck

    Staff Research Associate
    University of California
    Visalia, California

    • Co-Author(s)

  • NC

    Nick Clark

    University of California
    Hanford, California

Western tarnished plant bug (Lygus hesperus) insecticide trials in California Safflower

Benjamin Halleck and Nicholas Clark

University of California, Agriculture and Natural Resources

Western tarnished plant bug (Lygus hesperus) is a significant economic pest for various row crops in California, including higher-value crops like Pima cotton and processing tomato. Safflower is a host to lygus with relatively few insecticide options and is used as a rotational crop in the southern San Joaquin Valley of California providing soil conditioning benefits that support production of tomatoes and cotton. Timely insecticide applications using IPM decision making and area-wide approaches on safflower can effectively reduce Lygus nymphs before they are able to become winged adults and migrate into nearby higher-value crops, thus providing economic savings by reducing pesticide applications in nearby crops while improving crop quality. Individual trials over four site-years were used to evaluate the effects of the active ingredients, cyclaniliprole (Harvanta 50SL Insecticide), or acetamiprid (Assail 30 SG) as a foliar spray for control of Lygus on safflower. Lygus populations were assessed by counting the number of Lygus per 50 bug net sweeps. In summary our findings indicate cyclaniliprole offers potential to use in controlling Lygus nymphs while being relatively soft on beneficials and is currently awaiting label updates. Acetamiprid offered control against Lygus nymphs and adults for up to one week, provided some control on beet leafhopper, was relatively soft on beneficials, but also likely caused an increase in false chinch bugs and is currently under review for registration in safflower.