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Steward (TM) SC Field Performance Against Heliothines: Speed of Action, Symptmology, and Behavior of Treated Larvae

John T. Andaloro, Richard M. Edmund, Eric P. Castner, C. Steven Williams and Daniel W. Sherrod


 
ABSTRACT

Steward 15% SC is DuPont’s new reduced risk insecticide for cotton. Steward’s common name is Indoxacarb representing the new class of oxadiazine chemistry. Indoxacarb is registered globally in over 20 countries and actively being applied to cotton. EPA registered Indoxacarb in the US in fall, 2000 but Steward SC was available during the summer to most mid-South, Texas, and Oklahoma cotton growers through a Section 18. Steward is a potent lepidopteran insecticide that provided excellent control of heliothine species when applied during egg stage. Insects that have ingested a lethal dose may not show symptoms until after 24 hours and may not die until 3 days after exposure. Intoxicated insects are sluggish with paralyzed rear abdomens. Affected insects quickly cease feeding and thus begin to shrivel and desiccate and often fall off the plant. Insects sometimes appear to undergo difficulty in molting and digging into the soil to pupate if intoxication occurs just prior to these events. Live larvae present in squares during application are protected and do not pick up a lethal dose until they feed on treated material while seeking new squares. These observations indicate the difficulty in placing spray toxin in the location where heliothine larvae are feeding. And for products like Steward that depend on ingestion as a major mode of entry it emphasizes the importance of maximizing spray coverage and optimizing application technology equipment. Steward maintained control of cotton pests, showing excellent rainfastness despite overhead irrigation applied after spraying. . Steward was very effective against Lygus lineolaris and observations were made on suppression of stink bug feeding damage to lint. Steward had little impact on parasitic wasps, minute pirate bug, big-eyed bug, lacewings, spiders and predacious mites. These attributes combine to provide consistently high cotton yields and an effective pest management and resistant management tool for growers





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 925 - 926
©National Cotton Council, Memphis TN

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Document last modified XXXXXX, XXX XX 2001