Oebalus pugnax (Hemiptera: Pentatomidae) resistance to lambda-cyhalothrin in Texas and efficacy of 2 alternative insecticides in grain sorghum

Abstract Along the Coastal Bend of Texas, the rice stink bug, Oebalus pugnax (F.), is a major pest of grain sorghum and rice that is primarily managed by insecticide applications. Reports of rice stink bug resistance to pyrethroids in Texas first surfaced in 2015 and continued to spread. To determin...

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Published in:Journal of economic entomology 2024-10, Vol.117 (5), p.2060-2069
Main Authors: Gray, Danielle D, Biles, Stephen, Bernaola, Lina, Mays, D Tyler, Walker, Wade, Towles, Tyler, Kerns, David, Ludwick, Dalton C
Format: Article
Language:English
Subjects:
Animals
Cyhalothrin
Dimethoate
Field tests
Grain
Heteroptera
Insecticide Resistance
Insecticides
Insecticides - pharmacology
Nitriles - pharmacology
Nymph - drug effects
Nymph - growth & development
Oebalus pugnax
Pentatomidae
Pest resistance
Pyrethrins - pharmacology
Pyrethroids
Rice
Sorghum
Sorghum bicolor bicolor
Texas
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Summary:Abstract Along the Coastal Bend of Texas, the rice stink bug, Oebalus pugnax (F.), is a major pest of grain sorghum and rice that is primarily managed by insecticide applications. Reports of rice stink bug resistance to pyrethroids in Texas first surfaced in 2015 and continued to spread. To determine the status of pyrethroid resistance, rice stink bug populations across Texas and Louisiana were evaluated from 2021 to 2023. Mortality was assessed through glass vial exposures to eight concentrations (0, 0.03, 0.1, 0.3, 1, 3, 10, and 30 μg/vial) of a pyrethroid, lambda-cyhalothrin. The concentration of lambda-cyhalothrin required to kill 50% (LC50) of each population was estimated by probit analysis. Furthermore, the efficacy of insecticides, including lambda-cyhalothrin, dimethoate, and dinotefuran, were evaluated in field experiments conducted in 2021. Our results indicated that 14 of the 21 rice stink bug populations sampled were resistant to lambda-cyhalothrin, with LC50 values ranging from 42 to 1,600 times higher than a susceptible population. In the field trial, lambda-cyhalothrin did not control rice stink bugs. Dinotefuran provided excellent control of nymphs, but dimethoate provided greater control of adult rice stink bugs. To our knowledge, this is the first study to thoroughly evaluate the extent or geographic range of pyrethroid resistance in Texas for rice stink bugs.
ISSN:0022-0493
1938-291X
1938-291X
DOI:10.1093/jee/toae155