Bio-efficacy of new insecticides against paddy earhead bug, Leptocorisa oratorius (Fabricius)


Karibasappa G*, Vijay Kumar L, Basavaraju BS, Chandrappa and Kirankumar N

College of Agriculture, V. C. Farm, Mandya -571405

University of Agricultural Sciences, Bangalore, Karnataka.

*Corresponding author:

Volume 14(2), 2021  ;                           Click here  for Pdf

Received: 21st November 2021; Accepted : 23rd December 2021


The study was conducted to evaluate new insecticide molecules for the management of paddy earhead bug in field condition at College of Agriculture, V. C. Farm, Mandya, University of Agricultural Sciences Bangalore during kharif 2020. Nine different insecticides and one untreated control were evaluated. Number of earhead bugs per hill at day before spray (DBS), 1st, 3rd, 5th and 10th day after spray (DAS) were recorded. The data revealed that among different treatments fipronil 5 SC @ 2.00 mL L-1 was most effective with significantly lower population (0.10 bugs/hill) compared to rest of the treatments at 10 DAS. The grain and fodder yield were also significantly higher in fipronil 5 SC @ 2.00 mL L-1 treated plot followed by thiamethoxam 25 WG @ 0.30 g L-1. The results of the cost economics for the management of earhead bug revealed that fipronil 5 SC @ 2.00 mL L-1 recorded highest net returns with maximum benefit cost ratio (3.02: 1).rd