| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
