STUDIES ON THE BIOLOGY OF THRIPS (STENCHAETOTHRIPS BIFORMIS) OF MEGHALAYA

*Dr. S. Choudhury and Dr. M. Kharbangar

ABSTRACT

Study on biology of Stenchaetothrips biformis (Bagnall) on rice Oryza sativa (Linn.) showed that the thrips laid singly minute, kidney shape and translucent white in colour egg inside the leaf tissues with its pointed ovipositor. The average incubation period varied from 2.92 ± 0.18 days. The Larvae passed through two instars. The average first larval period varied from 3.38 ± 0.19 days and second larval period varied from 1.5 ± 0 days while both pre-pupal and pupal period were 1.38 ± 0.19 days, respectively. The average pre oviposition, oviposition and post- oviposition period were 2.63 ± 0.19, 3.29 ± 0.14 and 3.63 ± 0.49 days, respectively. The average fecundity of female was 22.25 ± 0.7 eggs during entire life span. The average longevity of adult was 21.79 ± 0.58 days. Total life cycle lasted for 25.75 to 36.17 days with an average of 30.96 ± 0.61 days.

Keywords: Stenchaetothrips biformis (Bagnall); Oryza sativa (Linn); Biology (Egg, Larvae, Pre-pupa, Pupa and Adult).