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Bio-safety of some microbial insecticides viz., Bacillus thuriengiensis var kurstaki (B.t.k.- 55000 S.U./mg (Halt) and B.t.k.- 32000 I.U. /mg (Biolep), Vertimec (Avermectin-1.8% w/v) and a bassina (Beauvaria bassiana-1 x 107 spore / ml) were studied against Menochilus Micraspis, Harmonia sp., and spiders (Lycosa, Oxeopes and Argeope sp.) under field conditions. The avermectin was highly toxic to spider reducing 42.65% population within three days after application and 41.51% of coccinellids after seven days of spraying. Adverse effect of B.t.k.- 32000 I.U./mg was more pronounced than B.t.k.- 55000 S.U./mg both at 1000 ppm against coccinellid beetles decreasing 40.28 and 36.08% in occurrence on 7 DAS respectively. Whereas, a reverse order of toxicity was found against spiders affecting 33.04 and 29.74% decrement in existence on 3 DAS. Beauvaria bassiana exerted its effect after a certain lag period and reduced the incidence of coccinellid (33.57%) and spider populations (21.01%) on 14 days after spraying.
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