Biology of mango leaf cutting weevil, Eugnamptus marginellus Fst. (Coleoptera: Curculionidae).
Rafiquzzaman M. D., Maiti B.
Author Affiliation: Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur - 741 252, Nadia, West Bengal, India.
Horticultural Journal 11 : 33-43
Abstract : The biology of Eugnamptus marginellus [Deporaus marginatus], a pest of mangoes, was investigated under laboratory conditions during its active period. Two to three days after emergence, the weevils mated freely, which lasted for 15-40 min. A female laid between 1 to 21 eggs on the leaf, usually on the dorsal side of the midrib. Larvae developed on fallen cut leaves by passing through three larval instars. The mean egg, larval, prepupal and pupal period were observed to be 46.40 h (1.93 days), 174.24 h (7.26 days), 111.24 h (4.64 days) and 169.48 h (7.06 days), respectively. Pupation took place in an earthen shell at a depth ranging from 3-5 cm. The adults were shiny dark brown with a light brown abdomen. The mean developmental period from egg to adult was completed in 501.36 h (20.89 days).