Bioefficacy of insect growth regulators (IGRs) as seed protectant against lesser grain borer, Rhyzopertha dominica (Fab.) on wheat

Abstract

The present was conducted to evaluate Bioefficacy of insect growth regulators (IGRs) as seed protectant against lesser grain borer, Rhyzopertha dominica (Fab.) on wheat at Jobner Jaipur Rajasthan in the year 2016-17. The insect growth regulators, viz. diflubenzuron, novaluron, lufenuron, pyriproxyfen and buprofezin (in four dosage levels, viz. 1,5,10, and 15 ppm) and neem oil (in three dosage levels 0.1,0.5 and 1.0%) and neem seed kernel extract (at three dosage levels 1.0%, 2.5% and 5.0%) were evaluated. A standard check of deltamethrin 2.8 EC @ 2 ppm and an untreated control was maintained for comparison. These treatments were evaluated on the basis of adult emergence, grain damage, weight loss and developmental period at 24 hours, 30, 60, 90, 120, 150 days after storage. Among these treatments, neem oil 1.0% and NSKE 5.0% exhibited nil emergences of adults, grain damage, weight loss and developmental period upto 150 days of storage. These treatments were followed by pyriproxyfen 15 ppm (0.00-2.00 F1 adults, 0.00-3.33 percent grain damage, 0.00-4.00 percent weight loss) and lufenuron (0.00-3.00 F1 adults, 0.00-5.00 percent grain damage, 0.00-4.67 percent weight loss). The developmental period was prolonged in pyriproxyfen 15 ppm (56.33-61.33 days) which was followed by buprofezin 15 ppm (55.33-59.67 days), however, all the treatments proved significantly superior over untreated check.