Efficacy of newer insecticides against sucking pests of hybrid cotton in the western undulating zone of Odisha

Abstract

The field experiment was conducted during Kharif, 2014-15 and 2015-16 in the research field of the All India Coordinated Research Project on Cotton at the Regional Research and Technology Transfer Station (OUAT), Bhawanipatna situated in the Western Undulating Agro-climatic Zone of Odisha to study the field efficacy of newer insecticides against sucking pests of hybrid cotton. The trial was laid out in randomized block design with three replications taking DCH 32 as the test hybrid with eight treatments viz.T1: Buprofezin 25%SC @ 250 g a.i/ha, T2: Flonicamid 50% WG @ 75 g a.i/ha, T3: Flonicamid 50% WG @ 100 g a.i/ha, T4: NSKE 5% @ 5 ml/lt, T5: Diafenthiuron 50% WP @ 300 g a.i/ha, T6: V. lacanii @ 10 g/lt, T7: M. anisopliae @ 10 g/lt and T8: Control (untreated). After three sprays the lowest mean population of jassids (1.19/3 leaves) was recorded in Flonicamid 50% WG @ 100 g a.i/ha and it was at par with Flonicamid 50% WG @ 75 g a.i/ha with (1.83/3 leaves) and second lowest mean jassids population was recorded in Diafenthiuron 50% WP @ 300 g a.i/ha) with (2.28/3 leaves) as compared to the control (17.42/3 leaves). Similar trend was observed in case of aphids and thrips. After three sprays the lowest mean population of aphid and thrips were recorded in Flonicamid 50% WG @ 100 g a.i/ha with 2.17 and 0.61/ 3 leaves which was at par Flonicamid 50% WG @ 75 g a.i/ha (2.47 and 0.94/3 leaves) and Diafenthiuron 50% WP @ 300 g a.i/ha (2.61 and 0.94/3 leaves) as compared to the untreated control with 24.75 aphids and 10.03 thrips/3 leaves. Maximum population of natural enemies was recorded in NSKE 5% @ 5 ml/lt. Maximum mean seed cotton yield (24.73 q/ha) was recorded in Flonicamid 50% WG @ 100 g a.i/ha, which was statistically at par with Flonicamid 50% WG @ 75 g a.i/ha with 23.79 q/ha, Diafenthiuron 50% WP @ 300 g a.i/ha with 23.33 q/ha and Buprofezin 25%SC @ 250 g a.i/ha with 21.73 q/ha. The increase in seed cotton yield in Flonicamid 50% WG @ 100 g a.i/ha was 51.25% over the control. The maximum net return (Rs. 62,077/ha) and B:C ratio (2.52) was obtained with Flonicamid 50% WG @ 100 g a.i/ha followed by Flonicamid 50% WG @ 75 g a.i/ha (Rs. 59,216/ha and 2.49).