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ViewAttendees 2

Student 10-Minute Paper

Plant-Insect Ecosystems

Student Competition

Student

Grad Competition P-IE: Insecticide Resistance

Monitoring the susceptibility of rice stink bug to pyrethroids

Monday, November 6, 2023
11:42 AM – 11:54 AM ET
Location: Gaylord National Resort & Convention Center, Chesapeake 3
In-Person Student Competition

    Presenting Author(s)

  • ML

    Mary Jane Lytle

    Mississippi State University
    Stoneville, Mississippi

    • Co-Author(s)

  • JG

    Jeff Gore

    Mississippi State University
    Stoneville, Mississippi

  • WC

    Whitney Crow

    Mississippi State University
    Cleveland, Mississippi

  • DC

    Donald Cook

    Entomologist
    Mississippi State University
    Stoneville, Mississippi

  • AC

    Angus Catchot

    Mississippi State University
    Starkville, Mississippi

Throughout the Mississippi Delta and Mid-South, rice, Oryza sativa L., producers have been dependent on pyrethroids to control rice stink bug, Oebalus pugnax F., due to the economic benefit pyrethroids deliver. The rice stink bug is a severe late-season pest of rice, feeding on developing grain and causing blanked heads and damaged kernels. Pyrethroid applications that provided inadequate control of rice stink bug have occurred over the last several years, suggesting potential resistance to the chemistry. Laboratory bioassays were conducted in 2021, 2022, and 2023 at the Delta Research and Extension Center in Stoneville, Miss. to determine the effectiveness of pyrethroids on rice stink bug management. The trial consisted of technical grade lambda-cyhalothrin, a commonly used pyrethroid, applied in liquid scintillation vials at multiple concentrations. Rice stink bugs were collected throughout the rice growing area. One rice stink bug was infested per vial and rated for mortality after 24 hours. Historical data from Mississippi in 2012 produced an LC50 value of 0.16 µg/ml. Concentrations tested in 2023, produced LC50 values >50 µg/ml. These results indicate a reduction in pyrethroid efficacy and a need for further evaluation of acceptable insecticides for rice stink bug control in the Mid-South.