Abstract
Apolar adjuvauts that were difficult to evaluate in an aqueous formulation were studied in a technical grade insecticide mixture. The combination was sprayed onto plants and tested as extenders of residual toxicity against 4th-instar Mexican bean beetle, Epilachna varivestis Mulsant, and 3rd-instar southern armyworm, Prodenia cridania (Cramer). Slightly less than half the adjuvants tested improved residual toxidty of the toxicants. Technical mevinphos mixtures with Carboset 525 (acrylic resin), Klucel HA (cellulose ether), and Gantrez AN 119 (polyvinyl ether—maleic anhydride resin) against Mexican bean beetle and Plaskon 9407 (polyester resin), Klucel HA, and Plaskon 9405 (polyester resin) against southern armyworm were effective combinations. Technical dichlorvos mixtures with Plaskon P.E. 258 (polyester resin) and Carboset 525 were the most effective combinations evaluated against Mexican bean beetle. The former along with Plaskon 9407 and 9405 were superior combinations against southern armyworm. Technical malathion mixtures with several adjuvants were difficult to evaluate, probably because of the slow loss of toxicant effectiveness.
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