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Field experiment carried out at ARS, Dharwad during 2013-14 to study the effect of seed treating chemical and spray formulations on morpho-physiological traits and their impact on sucking pests incidence in Bt cotton. Seed treatment with Imidacloprid 70WS registered higher seedling vigour index of 1089.00 as compared to 1053.00 in Thiamethoxam 35FS. Further, highest leaf specific weight of 0.043 g/cm2 was registered in Imidacloprid 70WS treated seeds were sown and sprayed with Imidacloprid 17.8SL. Similarly, Imidacloprid 17.80SL was sprayed as subsequent sprays registered higher relative water content of 88.87 per cent. | Effect of seed treatment and sprays formulations on morphophysiological traits of bt cotton and their impact on dynamics of sucking pests