Biology of Pulse Beetle, Callosobruchus chinensis L. (Coleoptera: Chrysomelidae) on Pigeonpea, Cajanus cajan L. Seeds

Author: Udagi, B.S., Manja Naik, C.*, Siddaraju, R. and Doddabasappa, B.

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Abstract

ABSTRACT: Biological attributes of pulse beetle, Callosobruchus chinensis L. was carried out on pigeonpea seeds in laboratory during 2020-21. The bruchid C. chinessis deposited their eggs singly on pigeonpea seeds. Incubation period varied from 4.95 ± 0.76, 5.23 ± 0.63 and 5.25 ± 0.67 days during September to December. Grub moulted three times and thus had four larval instars wherein, the durations of instars were 19.35 ± 1.43, 18.95 ± 1.33 and 20.00 ± 1.14 days during September to October, October to November and November to December, respectively. The mean pupal period of C. chinensis from September to December was 4.40 to 4.57 days. Mean adult longevity was 8.00 to 8.77 days during September to December. Sex ratio (Female: Male) was 1:1.33. As certain the pulse beetle biology which helps to understand the week stage of the menace and to develop the effective management strategies against this insect to protect the pigeonpea seed during storage.

Keywords

Keywords: Callosobruchus chinensis, biology, Cajanus cajan, seeds.