Bio-efficacy of various bio-rationals against aphid, Aphis gossypii Gloverinfesting isabgul

Abstract

An investigation was carried out during rabi, 2017-18 to evaluate the various bio-rationals against aphid, Aphis gossypii Glover in isabgul crop under field condition at S. D. A. U., Sardarkrushinagar, Dantiwada. The result of the field study revealed that, among the bio-rationals two sprays of Lecanicillium lecanii (1 × 109 cfu/gm) (40 g/10 lit.) found most effective treatment and it was closely followed by treatments L. lecanii (40 g/10 lit.) followed by Azadirachtin 10000 ppm (30 ml/10 lit.) as well as L. lecanii (40 g/10 lit.) followed by Azadirachtin 1500 ppm (40 ml/10 lit.) was effective against aphid. The highest seed yield of isabgul (895 kg/ha) was recorded in the treatment of L. lecanii(1 × 109 cfu/gm) (40 g/10 lit.) followed by L. lecanii (40 g/10 lit.).Thus, from the overall results it can be concluded that Lecanicilliumlecanii (1 × 109 cfu/gm) (40 g/10 lit.) followed by Lecanicillium lecanii(1 × 109 cfu/gm) (40 g/10 lit.) Proved most effective for the management of aphid, A. gossypii in isabgul crop.The treatment of L.lecanii (1×109cfu/gm) (40g/10lit.) Followed by L. lecanii (40g/10lit.) had obtained the highest seed yield of isabgul (895 kgha-1).