Abstract
The efficacy and longevity of various formulations of 10 insect growth regulators were investigated in the laboratory and field. Culex Pipiens quinquefasciatus Say larvae were utilized in the laboratory; C. tarsalis Coquillett, C. peus Speiser and Culiseta inornata Williston were studied in the field. The most effective compounds evaluated in the field were Dimilin® or TH 6040, HE-24108 and Altosid (methoprene). Dimilin [1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl)-urea] was evaluated as granules at the rate of 0.05 lb/acre against C. tarsalis , utilizing 4 different carriers. All formulations were equally effective, inhibiting adult emergence for ca. 15–18 days. HE-24108 [3-Butyn-2-yl-N-( p -chlorophenyl) carbamate] as EC and WP was applied at 0.5 and 1.0 lb/acre against C. inomata . Similar results were obtained with both formulations at the higher rate (1.0 lb/acre). yielding inhibition of emergence for 11 days. Methoprene (isopropyl 11-methoxy-3.7, ll-trimethyldodeca-2.4-dienoate) was tested as microencapsulated formulation SR10 with and without charcoal at 0.1 and 0.25 lb/acre against C. tarsalis, C. peus and C. inornata; both formulations were effective, yielding similar results.
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