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Georgia Journal of Science

Article Title

LABORATORY EVALUATION OF SELECTED INSECTICIDES ON FIELD-COLLECTED POPULATIONS OF BOLLWORM AND TOBACCO BUDWORM LARVAE-2018-UPDATE

Abstract

During 2018, bollworm (CEW) and tobacco budworm (TBW) larvae and adults were collected from a variety of host crops and evaluated for their susceptibilities to MVP II®, cyperemthrin, and spinosad (Tracer®). Results were compared to historical data collected throughout a twenty four-year study period which began in 1995. TBW, in Georgia, have remained susceptible to the effects of Cry1Ac, the Bt protein, found in MVPII®. However, MVPII® LC50s for CEW collected during the past two seasons have been some of the highest recorded. Although cypermethrin remained an effective insecticide to control CEW, the 2017 and 2018 values were among the highest values recorded since 2011. In general, the effectiveness of cypermethrin for the control of TBW larvae has declined. Data obtained from adult vial tests confirmed the larval studies and further indicated that CEW and TBW populations in Georgia were becoming less susceptible to the effects of pyrethroid insecticides. Spinosad (Tracer®) has remained relatively effective against CEW and TBW throughout the study period.

Acknowledgements

UWG Department of Biology, Georgia Cotton Commission, Cotton Incorporated

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