LC_(50)AND OVICIDAL EFFECT OF DIFFERENT BIO-PESTICIDE (PLANT OILS) AGAINST KHAPRA BEETLE, Trogoderma granarium EVERTS IN WHEAT, Triticum aestivum L.

摘要

Laboratory experiments were conducted during 2003-04 and 2004-05 with wheat, Triticum aestivum L. to determine the LC_(50) and ovicidal effect of different bio-pesticide (plant oils) against khapra beetle, Trogoderma granarium Everts. Ovicidal effectof different plant products arranged in descending order were karanj > neem > cardamom > linseed > lemongrass > juniper berry > castor > eucalyptus > mustard > groundnut > sesamum > palm > sunflower oils. The egg hatch inhibitions in different plant product (oils) were ranged from 29.83 to 64.49 per cent. Karanj oil was significantly superior in reducing the hatchability (64.49%) of eggs and least effective oils were sunflower (29.83%). The percentage of eggs hatch inhibition in all the treatments increased with the increase in concentration. The LC_(50) value increased than decrease the effectiveness of different plant products were observed. The LC_(50) ranged from 1.1025±0.3918 to 4.2190 ± 0.7560 of different treatments. The minimum LC_(50) values(1.1025±0.3918) in karanj oil and maximum (4.2190±0.7560) in sunflower oil were observed.