Vol. 10, Special Issue 11 (2021)

Author(s):
S Omprakash, C Narendra Reddy, P Swarna Sree, T Kiran Babu and M Sreedhar

Abstract:
A field experiment was conducted during summer 2019 and 2020 to study the field efficacy of certain insecticides against A. sesami on sesame. The pooled results revealed that, per cent flower infestation of A. sesami before insecticidal spray varies from 5.90 – 7.05 in different treatments. Five days after insecticidal spray, the lowest mean per cent flower infestation was recorded in spinosad 45% SC @ 0.3 ml lit^-1 treatment (3.08%) followed by profenophos 50% EC @ 2.0 ml lit^-1, chlorantraniliprole 18.5% SC @ 0.3 ml lit^-1 and acephate 75% SP @ 1.0 g lit^-1 with 3.90, 4.08 and 4.38 per cent flower infestation, respectively. Ten days after treatment imposition, significantly lowest mean per cent flower infestation was recorded in spinosad 45% SC @ 0.3 ml lit^-1 (1.40%) followed by profenophos 50% EC @ 2.0 ml lit^-1, acephate 75% SP @ 1.0 g lit^-1 and chlorantraniliprole 18.5% SC @ 0.3 ml lit^-1 with 2.37, 2.57 and 2.60 per cent flower infestation, respectively. Regarding pooled per cent reduction of flower infestation over control, highest was recorded in spinosad 45% SC @ 0.3 ml lit^-1 followed by profenophos 50% EC @ 2.0 ml lit^-1 with 81.12 and 68.04 per cent. Acephate 75% SP @ 1.0 g lit^-1, was the next best treatment with 65.34 per cent reduction flower infestation over control. The treatments viz., Chlorantraniliprole 18.5% SC @ 0.3 ml lit^-1, imidacloprid 17.8% SL @ 0.4 ml lit^-1 and ethofenprox 10% EC @ 2.0 ml lit^-1 and azadirachtin 1500 ppm @ 5.0 ml lit^-1 recorded the 64.93, 52.53, 51.31 and 26.77 per cent flower infestation reduction over control.