Bruchid Resistant Studies Using Stabilized Derivatives (F-7 Families) Of Interspecific Cross Cowpea X Rice Bean

Bruchid (Callosobruchus maculatus F.) is the main constraint in cowpea production. It can be controlled by chemical application but it is hazardous and not eco-friendly, hence attempt has been made to derive bruchid resistant lines by screening 100 stabilized lines from interspecific cross between cowpea and rice bean. In this experiment, screening of 100 F-7 segregants of cross DC615 (susceptible) x Dharwad local (resistant) along with checks (DC15, DCS47-1, RBHP-38 and IC18563) was carried out against bruchid through artificial infestation at the Department of Genetics and plant Breeding, University of Agricultural Sciences, Dharwad. Out of 100 segregants screened, 7 were highly resistant, 52 were moderately resistant, 21 were least susceptible, 12 were moderately susceptible and 8 were highly susceptible. The segregant F-7:78-1-1 registered least values for bruchid infestation, seed damage at 30, 45 and 75 days, loss of vigour and seed viability loss.