Abstract
Eleven mosquitocidal Bacillus thuringiensis isolates from Nigerian soils were screened for the degree of toxicity against Aedes aegypti larvae. The six most larvicidal isolates, code-named OBGI, OBG8, BUS4, BAR3, GSC3 and GNA13, were identified as subsp. israelensis (B.t.i). pores of the six isolates of a B. t. i. from a commercial powder (R-153-78, Roger Bellon Laboratory, Belgium) and of IPS 82 (Institut Pasteur (Standards)) were subjected to ultraviolet irradiation (280-350 nm) for up to 75 min. After irradiation, the toxicity of OBG8, OBGI, BUS4, and BAR3 was higher than that of R-153-78 but lower than that of IPS 82.
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