Management for the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), in Mississippi has been a challenge for growers in recent years. Research was initiated to evaluate efficacy and yield effects from applications of Diamond® insecticide in cotton. Results from tarnished plant bug (TPB) vial assays indicate 1st instar nymphs were significantly more susceptible to novaluron than 2nd and 5th instars. Laboratory experiments suggested that ingestion of novaluron by adult females significantly reduced the number of eggs laid and the percentage of eggs that hatched. Field trials in this study were used to investigate the value of Diamond insecticide applications during the growing season on both efficacy on TPB nymphs and lint cotton yield. Tank mixed with other insecticides, Diamond significantly improved control of tarnished plant bugs. Also, data suggests that the use of Diamond during the pre- flowering stages of cotton development can improve tarnished plant bug control and significantly increase yields.
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