Ecology, Environment and Conservation Paper

MANAGEMENT OF BROWN PLANTHOPPER (BPH), NILAPARVATA LUGENS (STåL) AND GUNDHI BUG LEPTOCORISA ACUTA, (THUNBERG) WITH NEWER INSECTICIDES IN RICE

Sandeep Chaudhary, M. Raghuraman and Amit Yadav

Abstract

Field trials were undertaken during Kharif season of 2011 with rice (Oryza sativa variety Naati Mansoori ) to manage the pest population of brown planthopper Nilaparvata lugens and Gundhi bug Leptocorisa acuta and to evaluate the bioefficacy of buprofezin, a chitin synthesis inhibitor buprofezin in combination with acephate at different doses against the brown plant hopper (BPH) and Gundhi bug in rice ecosystem. The treatments were sprayed thrice after transplanting. Results showed that among all the treatments Buprofezin 15% + Acephate 35% WP was most effective against both the sucking pests and conversely protected the crop. When applied at 1500 mL/ha, the mixture significantly suppressed the population of BPH to 3.89 per 5 hills respectively and gundhi bug to 1.66 per five sweeps. It also significantly increases the yield of rice (57%) over untreated control. The maximum yield (5545 kg/ha) was recorded in a combination product comprising of buprofezin (15%) and acephate (35%) WP formulation at 2500 g ai/ha followed by its lower dose, i.e. 1250 kg ai/ha and fipronil (5255 kg/ha). The yield of rice in untreated control was only 3540 kg/ ha. The results suggest that combination product of buprofezin and acephate are good substitutes for conventional insecticides in vogue, which could be used in formulating a successful management strategy of BPH and gundhi bug in rice.