The seed extract of the saltbrush Atriplex canescens (Forssk.) A. Nutt. was tested for insecticidal and ovicidal activity against the mosquito Culex quinquefasciatus Say. The exposure of early fourth instar mosquito larvae to a series of aliquots of the seed extract revealed a significant larval and adult mortality at 0.1-1000 ppm. Seed extract also demonstrated some ovipositional deterrence and ovicidal activity against C. quinquefasciatus.
Ten of 80 endospore‐forming bacilli, isolated from various habitats of Jordan, were found to be highly toxic to the 4th instar larvae of Culiseta longiareolata (Macquart). The bacilli were identified into the following species and strains : Bacillus sphaericus (H6), B. sphaericus (H9a, 9b), B. cereus Frankland and Frankland, B. brevis Migula and B. megaterium Bary. Bacillus cereus comprised 50% of the isolates. The toxic concentrations of these isolates against C. longiareolata ranged between 1·2 × 107 and 1·1 × 109 viable spores ml−1.
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