Inheritance study on jassid (Amrasca biguttula biguttula) tolerance in F2 population of upland cotton (Gossypium hirsutum L.)

India is one of the largest producers cotton in world, but productivity comparatively low. One major factors limiting pest infestation. Earlier production was inhibited by boll worms which now coped up with Bt sucking infestation still a prime concern. This study conducted F2 population four upland crosses- TVH002 x RAHC1039, TCH1894 NDLH32, CO17 KC2 and KC3, were evaluated for inheritance pattern jassid tolerance. Three crosses segregated 3:1ratio (Resistant, susceptible) fourth cross 13:3 ratio susceptible), showing digenic interaction. Further molecular investigation essential to confirm this progress work direction.