Effect of Vertimec®, a microbial insecticide on the pink bollworm, Pectinophora Gossypiella (Saunders) [electronic resource]: B-Biological studies and life table parameters.

Includes reference

ABSTRACT: The toxicity and biological effects of sub-lethal concentrations of the microbial insecticide vertimec (product of Streptomyces avermitilis-Avermectin-1.8% w/v) on pink bollworm (PBW), Pectinophora gossypiella larvae were evaluated under laboratory conditions. The effects of vertimec on some biological activities of PBW larvae were recorded The tested compound prolonged the larval period (21.97 days) than the control (17.49 days). Also, the larval weight of the 2nd instar larvae was affected, where the average weight was 2. 78 mg in control, while it was significantly decreased to 0.47 mg in larvae treated with vertimec. In contrast, weight of the 4th larval stage was significantly increased in vertimec treatment (28. 86 mg) . The pupal duration, pupal weight and pupal mortality were not significantly affected, whereas the pupation percentage was inhibited due to the latval treatment. Obviously, the earlier treatment of newly hatched larvae of PBW with vertimec was extended to the produced moths. Vertimec gave 87.06% moth emergence compared with the control (98.36%). Sex ratio was directed to the male side (66.41 %).

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