The field experiments were carried out to determine the bioefficacy of new insecticidal molecules chlorantraniliprole (Coragen 18.5 SC), pyridalyl (Sumipleo 10 EC) and emamectin benzoate (Proclaim 5 SG) against shoot and fruit borer, Earias vittella in okra crop. The experiments were conducted at farmer's field and PAU Regional Research Station, Gurdaspur during 2017–18 and 2018–19, respectively. The significantly lower infested shoots 0.49, 0.54 and 0.59 per plant were recorded ten days after application of chlorantraniliprole, emamectin benzoate and pyridalyl @ 30, 8.75 and 62.5 g ai ha-1, respectively. Maximum (87.1%) reduction in fruit infestation over control was recorded with application of chlorantraniliprole and it was closely followed by emamectin benzoate and pyridalyl @ 8.75 and 62.5 g ai ha-1 with reduction in fruit infestation of 83.2 and 82.6%, respectively. Significantly, more marketable fruit yield (122.40 q ha-1) was obtained from plots treated with of chlorantraniliprole @ 30 g ai ha-1 and it was at par with emamectin benzoate and pyridalyl @ 8.75 and 62.5 g ai ha-1 with an average marketable fruit yield of 121.7 and 120.0 q ha-1, respectively. Maximum cost benefit ratio (1: 36.5) was achieved by spray of emamectin benzoate @ 8.75 g ai ha-1 and it was followed by chlorantraniliprole and pyridalyl @ 30 and 62.5 g ai ha-1 with mean C:B ratio of 1: 21.7 and 1: 21.6, respectively. All new insecticidal molecules under study had neither any significant adverse effect on population of natural enemies of okra insect-pests nor any phytotoxicity to okra crop.
Randhawa et al. (Sun,) studied this question.