Studies on biology of yellow mite, Polyphagotarsonemus latus (Banks, 1904) (Acari: Tarsonemidae) on Bt cotton in laboratory condition

Abstract

Biology of yellow mite, Polyphagotarsonemus latus (Banks, 1904) (Acari: Tarsonemidae) on Bt cotton was studied under laboratory conditions during kharif-2017 and 2018 at the College of Agriculture, Dharwad. The results indicated that duration of incubation period, larval period and quiscent larval period was 2.05 ± 0.08, 1.61 ± 0.07 and 1.47 ± 0.02 days respectively. So total development period was 5.13 ± 0.20 days whereas pre-oviposition, oviposition, post-oviposition period was 1.28 ± 0.05, 7.95 ± 0.34 and 1.22 ± 0.08 days respectively. Adult longevity for male was 14.56 ± 0.39 days whereas the adult female lived for 15.59 ± 0.31days. Mated female lays eggs singly on upper surface of leaf with an average of 35.50 eggs per female. The length and breadth of egg was 108.34 ± 5.87 μm and 71.59 ± 3.13 μm respectively. The length and breadth of larva was 228.09 ± 6.51 μm and 122.22 ± 3.64 μm respectively. The length and breadth of quiescent larva was 294.1 ± 16.04 μm and 137.95 ± 13.64 μm respectively. The length of female and male was 194.54 ± 14.59 μm and 194.25 ± 19.80 μm whereas breadth was 120.47 ± 9.70 μm and 109.92 ± 10.07 μm respectively.