EFFECT OF SOME PESTICIDES ON ADULT EMERGENCE OF TELENOMUS DIGNUS(GAHAN), AN EGG PARASITOID OF YELLOW STEM BORER, SCIRPOPHAGA INCERTULAS (WALKER)

摘要

Effect of five pesticides, viz. methyl parathion 50 EC (0.125%), monoerotophos 36 SL (0.09%), chlorpyriphos 20 EC (0.1%), quinalphos 20 AF (0.04%) and trieyclazole 75.WP (0.045%), recommended in rice crop for the control of insect pests and diseases,was studied on the adult emergence of Telenomus dignus (Gahan) under laboratory conditions. There was no emergence of T. dignus adults from the egg masses dipped in methyl parathion, chlorpyriphos and quinalphos but on an average 25.4, 15.9 and 30.7 adults per egg mass emerged from the egg masses dipped in monocrotophos, trieyclazole and distilled water (check), respectively. Thus, monocrotophos and trieyclazole may be considered relatively safe to the parasitoid.