Evaluation of Thryvon Technology for Control of Tarnished Plant Bug in Cotton.

Tarnished plant bug (TPB) is the most important pest in mid-South cotton production, causing square loss, deformed flowers, and damaged bolls, ultimately reducing yield. Tarnished plant bug is difficult to control, with growers averaging 4-6 insecticide applications per year. A field study was conducted in Marianna, Arkansas in 2021 to evaluate Thryvon, a new transgenic trait in cotton that produces the Bt protein Cry51Aa, for TPB control. The trial consisted of Thryvon and non-Thryvon cotton that were either left untreated or sprayed at 1x, 2x, or 3x the currently recommended University of Arkansas System Division of Agriculture threshold. Based on our standard threshold, Thryvon required 2 applications for TPB compared to 5 in non-Thryvon at Marianna. Yields in unsprayed Thryvon were no different than any of the sprayed Thryvon treatments. Results from this study indicate that Thryvon may be a valuable tool in TPB management. [ABSTRACT FROM AUTHOR]

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