Pathogenicity of Industrial Formulations of Bacillus thuringiensis Serovar. israelensis to Larvae of Some Culicine Mosquitoes in the Laboratory

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Abstract
At the laboratory, Teknar, a flowable concentrate formulation, and at Bactimos and Vectobac, 2 wettable powder formulations of B. thuringiensis serovar israelensis (Bti) were tested against laboratory maintained late 3rd and early 4th instars of Aedes taeniorhynchus (Wiedemann), Anopheles albimanus Wiedemann, Culex nigripalpus Theobald, C. restuans Theobald, C. salinarius Coquillett, C. quinquefasciatus Say, and Wyeomyia vanduzeei Dyar and Knab. Aedes taeniorhynchus was susceptible (LC90 = 0.114-0.772 ppm) to the test formulations. C. nigripalpus was generally the most susceptible to each formulation, followed by C. salinarius, C. quinquefasciatus and C. restuans. The 3 formulations were relatively ineffective against Anopheles albimanus and W. vanduzeei. Considering the relative potencies of the test formations, Bactimos invariably was the most effective formulation and, Teknar, the least against the species tested under laboratory conditions.

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