Bioefficacy of Abamectin and Emamectin Benzoate against Spodoptera litura (Fab.)

The LC50 values of abamectin and emamectin benzoate against third and final instar larvae of Spodoptera litura Fab. by leaf disc ingestion method were 13.9 and 65.7 μg mL−1 and 0.5 and 1.1 μg mL−1 compared to 296.8 and 5014.2 μg mL−1, and 19.1 and 359.5 μg mL−1 in topical method, respectively. The LC50 value of these compounds against eggs and pupae of S. litura by dip method were 2.0, 69.5, 0.1 and 5.3 μg mL−1, respectively. Whereas the LD50 values of abamectin and emamectin benzoate against the third instar larvae by topical method were 0.0096, 0.0111, and 0 0003, 0.0008 μg mg−1 larval weight respectively The LT50 values of abamectin against third and final lnstar larvae of S. litura by leaf disc ingestion method ranged between 52.8 and 22.4 h (20 to 150 μg mL−1), whereas in topical method it ranged between 74.0 and 22.5 h (400 to 6500 μg mL−1). The LT50 value of emamectin bbezoate aaainst the third and final instar larvae by leaf disc ingestion method ranged between 79.9 and 23.7 h (0.6 to 2.4 μg mL−1), whereas in topical method, it ranged between 72.4 and 24.3 h (25 to 850 μg mL−1).