Efficacy of botanical and microbial extracts against Angoumois grain moth Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae) under laboratory conditions

Abstract

Larval mortality, food consumption and percent (%) repellency of S. cerealella was assessed for 10 days against the chemical (Chlorpyrifos @ 5000ppm), microbial (Aspergillus, Penicillium @ 10000ppm) and botanical (Melia azedarach, Polygonum hydropiper @ 10000ppm) extracts. Maximum mean larval contact mortality of 9.78 was observed for Chlorpyrifos with a minimum mean larval contact mortality of 0.03 for control. S. cerealella larvae showed maximum mean consumption of 0.72g for control with a minimum consumption of 0.05g for Chlorpyrifos during the assessment of consumption of the infested food with different treatments. Maximum mean larval oral mortality of 8.78 was observed for Chlorpyrifos whereas minimum mean larval oral mortality of 0.21 was noted for control. Results showed maximum consumption of 0.44g food for control and minimum consumption of 0.01g infested food for Chlorpyrifos during oral toxicity consumption (g). Maximum mean percent repellency for Aspergillus was 93.82%Penicillium with minimum of 50.02% for control.