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Evaluation of methoprene, temephos and Bacillus thuringiensis var. israelensis against Coquillettidia perturbans larvae in Minnesota.

Temephos, Bacillus thuringiensis var. israelensis (B.t.i.) and methoprene were tested for larval control of Coquillettidia perturbans. Neither temephos nor B.t.i. treatments at their maximum recommended dosages consistently reduced larval numbers. Larval emergencies were reduced 99% in test plots treated with experimental, controlled release methoprene briquets (Altosid SR-10). Breeding sites of Cq. perturbans in a 5,000 km2 area were treated using methoprene briquets in the 1984 season. Adult populations in a 7,700 km2 area were 2.5 times higher in untreated areas than treated areas. Methoprene can effectively control larval populations of Cq. perturbans.