Effect of total Gossypol Concentration on Spotted Bollworm Earias Spp. in different Gamma Irradiated Cotton Lines

The gossypol content of cotton Gossypium spp. has been of interest to plant breeders because those that have high levels often carry resistance to the spotted bollworm. However, its presence has economic disadvantages to the seed and oil processing industry. The cage experiment was evaluated on no food choices of Earias insulana (Boisd.) and Earias vittella (Fab.) and their relation with gossypol concentration in floral squares, flowers and green bolls during 2009. The result showed that highly susceptible parent line St-7 and B-3 irradiated with 250 Gy and highly resistance St-7 and SP cotton lines treated with 150 Gy to both Earias spp. A correlation showed significant and non-significant negative correlations with gossypol concentration in all parent and their gamma irradiated (150, 200, 250 Gy) cotton lines against both Earias spp. Correlation coefficient results revealed that the maximum gossypol concentration was most important factor to develop resistance against both spotted bollworm species.