Evaluation of Novel Insecticides Against Spotted Pod Borer, Maruca Vitrata (Geyer) in Greengram

Abstract

The present investigation was undertaken to evaluate the novel insecticides against spotted pod borer M. vitrata (Geyer) in greengram conducted in randomized block design with three replications and eight treatments during Kharif, 2019 at Crop Research centre (CRC), Department of Entomology, SVPUA&T, Meerut-250110 (UP). The seasonal incidence of M. vitrata was observed from 36th standard meteorological week (1st week of September) upto 42nd standard meteorological week (3rd week of October). The maximum incidence was observed during 40th standard meteorological week (1st week of October) with 18.67 larvae per ten plants. The correlation of spotted pod borer larval population was found non significant positive with minimum temperature (r = 0.273), evening relative humidity (r = 0.044) and rainfall (r = 0.681) and non significant negative correlation with maximum temperature (r= -0.194) and morning relative humidity (r= -0.111) during Kharif, 2019. Among all the novel insecticides, i.e. Emamectin benzoate 5SG @ 0.4 ml/ lit, Spinosad 45SC @ 0.25 ml/ lit, Chlorantraniliprole 20SC @ 0.025 ml/ lit, Indoxacarb14.5SC @ 1.0ml/ lit, Novaluron10EC @ 1 ml/ lit, Profenophos 50 EC@ 1 ml/ lit and Triazophos 40EC@ 2 ml/ lit, the insecticide Chlorantraniliprole 20SC @ 0.025 ml/ lit was found best in reducing the number of M. vitrata with 1.67, 1.00 and 0.33 larvae per ten plants at 3, 7 and 11 days after second spray and also found effective with minimum pod infestation of 7.33 per cent. The Spinosad 45SC @ 0.25 ml/ lit was second best treatment with 2.00, 1.33, 0.67 larvae per ten plants at 3, 7 and 11 days after second spray and found effective with pod infestation of 10.67 per cent. The treatment Chlorantraniliprole 20SC @ 0.025 ml/ lit was found best with maximum grain yield (8.61q/ ha) and maximum returns (Rs 39249.5/ ha) followed by Emamectin benzoate 5SG @ 0.4 ml/ lit (7.77q/ ha, Rs. 35027.5/ ha) and Spinosad 45SC @ 0.25 ml/ lit (6.94 q/ ha, Rs. 27806/ ha and). The treatment Emamectin benzoate 5SG @ 0.4 ml/ lit was found best with maximum cost benefit ratio 1: 8.54 followed by Chlorantraniliprole 20SC @ 0.025 ml/ lit (1: 6.76) and Spinosad 45SC @ 0.25 ml/ lit (1: 5.08). Among all the treatments, Novaluron10EC @ 1 ml/ lit water was found safest with maximum number of C. septempunctata as 3.67, 3.33 and 3.67 beetles per ten plants after first spray and 2.67, 2.33 and 2.00 beetles per ten plants after second spray at 3, 7 and 11 days, respectively and the second safe treatment was Profenophos 50 EC@ 1 ml/ lit (5.00, 3.00 and 2.67 beetles per ten plants) after first spray and (2.33, 2.00 and 1.67 beetles per ten plants) after second spray at 3, 7 and 11 days, respectively.