Department of Entomology, Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni, Solan-173 230, Himachal Pradesh (India).
Biology of the black bean bug, Chauliops nigrescens Distant, a serious pest of french bean crop in the mid hill regions of Himachal Pradesh was studied under laboratory conditions. The ambient temperature varied between 23 and 28°C and R.H. was 89 per cent. The total duration of five nymphal instars varied between 18 and 23 days, the mean being 19.6 days. In a life span of 25.4 days, a female on an average laid 45 eggs. The mean hatchability of eggs was 90 per cent and the incubation period recorded as 8.7 days. Male lived shorter than the female, the longevity being 20.9 days. The mean pre-oviposition, oviposition and post-oviposition periods were 8.7, 15.5 and 1.2 days, respectively.
