OVICIDAL ACTION OF NEWER INSECTICIDE MOLECULES AGAINST THE EGGS OF TOBACCO CATERPILLAR, SPODOPTERA LITURA (FABRICIUS)

摘要

Ovicidal action of nine insecticides against Spodopiera litura (Fabricius) was assessed under laboratory conditions. The age of S, litura eggs influenced its susceptibility to all newer insecticide molecules tested. The results in the present investigation revealed that highest egg mortality was recorded in one day old eggs than two or three day’s old eggs. In one day old eggs the maximum mortality of95.32 per cent was recorded in thiodicarb 75 WP @ 1 g/1 followed by emamectin benzoate 5 SG @ 0.25 g/1 (91.30%), flubendiamide 480 SC @ 0.2 ml/1 (83.47%), chlorantraniliprole 18.5 SC @ 0.2 ml/1 (82.62%), cyantraniliprole 10 OD @ 0.2 mI/1 (74.00%), chlorpyriphos 20 EC @ 2 ml/1 (71.90%), spinosad 45 SC @ 0.2 ml/1 (69.23%), chlorfenapyr 10 SC @ 3 mI/1 (65.93%) and indoxacarb 15.8 EC @ 0.3ml/l (54.17%). In two days old eggs the maximum mortality (86.63%) was rec6rded in thiodicarb 75 WP @ 1 g/1, followed by flubendiamide 480 SC @ 0.2 ml/1 (72.04%), chlorpyriphos 20 EC @ 2 ml/1 (66.53%). In three days oldeggs the maximum mortality (83.32%) was recorded in thiodicarb 75 WP @ 1 g/1, followed by indoxacarb 15.8 EC @ 0.3 ml/I (46.33%), chlorantraniliprole 18.5 SC @ 0.2 ml/1 (44.50%). The mean mortality of eggs indicated that, the egg mortalities were highestin thiodicarb 75 WP @ 1 g/1 (88.43%) followed by flubendiamide 480 SC @ 0.2 ml/I (65.95%), emamectin benzoate 5 SG @ 0.25 g/1 (63.98%) and chlorantraniliprole 18.5 SC @ 0.2 ml/1 (63.19%). Thus, thiodicarb 75 WP@ 1 g/1 proved to be an effective ovicide by recording 88.43 per cent e^ mortality.