Department of Entomology, Assam Agricultural University, Jorhat-785 013, Assam, India
* Present mailing address: Plant Protection Department, Tocklai Experimental Station, Jorhat-785 008, Assam, India
Online published on 3 November, 2011.
Effects of methoprene were assayed on the developmental stages of rice hispa, Dicladispa armigera (Olivier) (Coleoptera, Chrysomelidae) by applying its aqueous suspension on larvae and pupae. Methoprene produced morphogenetic effects on larvae and pupae, The respective LC50 values against larvae and pupae being 1.26 and 1.13 ppm. Formation of intermediates with varying degree of deformities was dose dependent. It produced malformation on elytron, hind wing, pronotal ‘four-proned spine’, antenna, aedeagus and ovipositor in the resultant adultoid when it was applied to pupae.
Rice hispa, methoprene, post embryonic development, Dicladispa armigera
