Efficacy of different oils against pulse beetle, Callosobruchus chinensis in greengram Vigna radiata and their effect on germination

A Laboratory experiment was conducted to evaluate the efficacy of six different oils viz., neem, mehandi, castor, karanj, mustard and olive against Callosobruchus chinensis in greengram. The seed/coating of these oils gave significant protection against Callosobruchus chinensis as compared to untreated control. The oil coating 6-8 hrs. after treatment at doses of 2.5; 5 and 10 ml/kg seeds whereas partial to complete protection was observed at 90, 150 and 210 days after treatment, neem and mehandi oils at the dose of 10 ml/kg seed were effective even beyond 150 days after treatment and rest of the oils were effective even after 280 days of oil treatment. The germination test was also carried out with the oil treated seeds (6 to 8 h, 90, 150 and 210 days after treatment), where, the treated seeds were given 8 h. exposure to sun showed non-significant differences may be treatments as well as untreated control.