Vol. 12, Issue 5 (2023)

Author(s):
Hemlata, Dr. YK Yadu, Aalok Kumar and Ashithosh Mohanan

Abstract:
In present studies efficacy of different insecticides against defoliators of soybean are evaluated, six insecticides are applied in plots of size 20m² under Randomized Block Design having 7 treatments and 3 replications. After 1^st spray the lowest population of tobacco caterpillar was found in Alphacypermethrin (0.09) followed by Teflubenzuron (0.10), Chlorantraniliprole (0.10), Profenophos (0.36) and Indoxacarb (0.97). Lowest population was found in the control plot (0.05) however, in the 2^nd spray the lowest population of tobacco caterpillar seen in Chlorantraniliprole (0.08) followed by Teflubenzuron (0.11), Alphacypermethrin (0.14), Profenophos (1.25) and Indoxacarb (1.41). Highest population of tobacco caterpillar was found in untreated plot (0.20). The effect of different insecticides are evaluated to check the mean population of defoliators in which Alphacypermethrin @ 300 ml/ha was most effective for tobacco caterpillar, whereas Teflubenzuron @ 200 ml/ha was moderately effective for green semilooper and whitefly, and Chlorantraniliprole @ 150 ml/ha was effective against thrips and jassids. The insecticides Indoxacarb @ 333 ml/ha and Profenophos @ 1000 ml/ha was moderately effective on these insect pest of soybean whereas Triazophos @ 1000 ml/ha was least effective.