A Practical Evaluation of TH6040 as a Mosquito Control Agent in California1

Abstract
TH6040 (1-[4 chlorophenyl]-3-[2, 6 difluorobenzoyl]-urea) successfully controlled mixed species populations of Aedes nigromaculis (Ludlow) and A. melanimon Dyar when 0.025 lb AI/acre was applied by aircraft. This dosage was operationally effective against organophosphorus-resistant strains of these species in both the Sacramento and San Joaquin Valleys. TH6040 also provides a means of controlling organophosphorus-resistant strains of Culex tarsalis Coquillett, a vector of St. Louis and Western equine encephalitis in California.

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