Vol. 8, Issue 1 (2020)

The results revealed that all the insecticide treatments were significantly effective in reduction of fruit borers infestation on number basis as well as weight basis after first and second sprays on okra. Among the test insecticides, chlorantraniliprole 18.5% SC (2.99 and 3.30%) recorded minimum mean per cent fruit infestation on number basis as well as weight basis, respectively and it was at par with spinetoram 11.7% SC (3.28 and 3.81%) and spinosad 45% SC (4.02 and 4.33%). Whereas, lambda cyhalothrin 4.9% CS was least effective against fruit borer on number basis (7.26%) and weight basis (7.82%) with mean fruit infestation on first and second sprays, respectively.

The highest marketable fruit yield of 90.20 q/ha was recorded in the treatment chlorantraniliprole 18.5% SC followed by spinotoram 11.7% SC (89.35 q/ha). The highest net returns of Rs. 35375/ha was also achieved through chlorantraniliprole 18.5% SC. The highest incremental cost benefit ratio (ICBR) of 1:18.70 was achieved with emamectin benzoate followed by lambda cyhalothrin (1:17.51). Whereas, the lowest ICRB (1:02.89) was found in plot treated with spinetoram 11.7% SC, it may the expensive cost of insecticide.