Biology of leaf weevil, Cyrtozemia dispar Pascoe [Coleoptera: curculionidae] infesting groundnut

Abstract

Investigations on biology of groundnut leaf weevil, Cyrtozemia dispar Pascoe were carried out under laboratory condition in Department of Entomology, College of Agriculture, Junagadh Agricultural University, Junagadh during Kharif, 2018. The leaf weevil laid eggs mostly on the tips with average incubation period 5.03 ± 0.77 days. The larval stages were passed through five different instars and found inside the soil. Total grub period and pupal period were 25.40 ± 2.00 and 3.08 ± 0.41 days, respectively. Adult found on foliage and the longevity of adult male and female leaf weevil was 17.70 ± 2.67 and 21.85 ± 3.13 days, respectively. The total life period (from egg to the death of adult leaf weevil) of female was 55.35 ± 4.40. While, in male it was 51.23 ± 3.21 days.