Ovicidal Action of Insecticides, Moult Inhibitor and Fungicides on the Eggs of Rice Leaf Folder and Stem Borer

Sprays of Cypermethrin and fenvalerate @ 0.01%, deltamethrin and permethrin @0.00125% resulted 90.0, 90.5, 90.2 per cent mortality of eggs of leaf folder. Phosphomidon 0.045%, quinalphos and monocrotophos 0.05% resulted in 88.9% mortality as against 83.4, 83.3, 80.9, 79.5 and 70.7% mortality respectively in captafol 0.03%, mancozeb 0.15%, edifenphos 0.1%, carbendazim 0.1% and diflubenzuron 200 ppm treatments.

Phosphomidon 0.045%, quinalphos 0.05%, fenthion 0.01%, malathion 0.01% and chlorpyriphos 0.04% recorded 84 to 86.7 per cent mortality of eggs of stem borer. A negative correlation was kDOwn to exist between the age of eggs and per cent mortality of eggs of stem borer due to insecticides and when the age ot eggs increased by one day, their susceptibility decreased by 3.9 per cent.