Effect of new cotton insecticide chemistries, tebufenozide, spinosad and chlorfenapyr, on Orius insidious and two Cotesia species
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Three new insecticide chemistries recommended for cotton, tebufenozide (Confirm(TM)), spinosad (Tracer(TM)) and chlorfenapyr (Pirate(TM)), were evaluated for their effects on survival of two key beneficial insects, the predaceous insidious flower bug, Orius insidiosus (Say)(Heteroptera: Anthocoridae), and the parasitic wasp of many lepidopteran pest larvae, Cotesia marginiventris (Cresson) (Hymenoptera: Braconidae). The closely related species Cotesia plutella (Kurdjumov) (Hymenoptera: Braconidae) was also evaluated. The mortalities of insects exposed for 24 or 48 h, respectively, to fresh dried foliar residues of these insecticides were compared in the laboratory. Mortality of O. insidiosus on Confirm(TM) and Tracer(TM) treated leaves was low, ≤18%, and similar to that of the control. Karate(TM) was the most toxic, killing > 87% of adult O. insidiosus after 24h. Pirate(TM) was intermediate in toxicity, killing 21-55% of O. insidiosus. Residues of Confirm(TM) also were nontoxic to adult C. plutella. However, Tracer(TM) and Pirate(TM) residues were toxic to this parasitoid and to C. marginiventris. Pirate(TM) was more toxic than Trace(TM) to these two parasitoids. Therefore, under the conditions of this study, Confirm(TM) and Tracer(TM) were less harmful than Pirate(TM) for all species tested. A simple toxicity rating system for insecticide selectivity to beneficial insects is discussed.
author list (cited authors)
Pietrantonio, P. V., & Benedict, J. H.