Abstract

: Plant extracts/powders have potential to employ as promising and encouraged alternatives to synthetic insecticides in controlling stored grain pest. During present study, trials were carried out with five plants leaves powders [Grewia optiva leaf powder (GOLP), Morus alba leaf powder (MALP), Murraya koenigii leaf powder (MKLP), Ficus carica leaf powder (FCLP) and Ricinus communis leaf powder (RCLP)]. Highest insecticidal efficacy against oviposition and emergence of Callosobruchus maculatus were recorded after treatment with Ricinus communis leaf powder (RCLP). RCLP also offered maximum protection of black gram seeds applied at the dose of 20 g/kg seeds of black gram. Within seven days pest mortality percentile was maximum (86.67 %) as compared to other leaf powders. Whereas in untreated control, zero mortality was recorded. The lowest fecundity (186.6±3.91), pest emergence (95.4±2.89), seed damage (18.00%), and weight loss (5.28%) were noted with RCLP at the dose of 10.0 g/kg. In ovicidal treatment, RCLP inhibited the entire tested population emergence at 10 and 20 g/kg black gram seeds. The complete inhibition was also observed in 1st and 2nd instar larvae. Treatment of 3rd and 4th instar larvae with RCLP showed inhibition.

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