4. Evaluation of the host preference and life history of Callosobruchus maculatus (F.) (Cowpea weevil) (Coleoptera: Chrysomelidae) on stored pulses

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Nosheen Jehajo and Nasreen Memon Din


Callosobruchus maculatus (F.) is a major store grain pest of economically important pulses in tropical and sub-tropical countries of the World. Successful survival of different geographical strains of cowpea weevil may variable on different host pulses. In present investigation, life stages of Hyderabad strain of Callosobruchus maculatus were observed on four types of stored pulses namely green gram, cowpea, chickpea and black gram at different laboratory conditions for the assessment of host preference and better management of storage. The result indicated that the Callosobruchus maculatus (F.) prefers cowpea for its oviposition, because the highest number of eggs was found on cowpea followed by green gram & chickpea and the lowest number of eggs was observed on black gram. The highest population was recorded on cowpea followed by green gram, black gram & chickpea. The short developmental period of cowpea weevil was observed on cowpea, green gram & chickpea while longest was on the black gram. The longevity of C. maculatus was longer on black gram while shortest longevity was observed on cowpea and green gram. From this study it was concluded that the cowpea and green gram was most preferable host pulses for C. maculatus, they were also susceptible and vulnerable among all four studied stored seeds while chickpea and black gram were less preferable host and have moderate susceptibility to the Hyderabad strain of Callosobruchus maculatus (F.).

Keywords: Adaptation; Biological parameters; Damage; Infestation; Pulse beetle; Stored products protection


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