Field evaluation of EC formulations of Metarhizium anisopliae (Meschinikoff) Sorokin and insecticides against groundnut white grub, Holotrichia fissa Brenske

Abstract

A field experiment against groundnut white grubs, Holotrichia fissa was laid out in the Hattarawata village of chikkodi taluka, Belgavi district, Karnataka, India during 2013-2014 cropping season. At 30 DAT chlorpyriphos 20 EC @10 l/ha, rynaxypyr 4G @ 20kg/ha, M. anisopliae (Novozyme) @5×109 (3ml/l) and M. anisopliae (Novozyme) @5×109 (2.5 ml/l) cent per cent reduction whereas, M. anisopliae (T-stanes) @1×109 (3ml/l) and M. anisopliae (T-stanes) @1×109 (2.5ml/l) could also produce similar effects among themselves and registered 98.10 and 96.32 % reduction respectively. But, they were significantly superior over M. anisopliae (T-stanes) @1×109 (5 kg/acre), M. anisopliae (Novozyme) @5×109 (2ml/l) and untreated check. Among EC formulations, M. anisopliae (Novozyme) @5×109 (3ml/l) and M. anisopliae (T-stanes) @1×109 (3ml/l) recorded 18.00 and 17.88q/ha yield respectively next to chlorpyriphos 20EC @ 10ml/ l and rynaxypyr 4G @20 kg/ha with 19.17 and 19.16 q/ha respectively. The average benefit for every rupee invested was highest (2.15) in chlorpyriphos 20EC @ 10ml/ l followed by M. anisopliae (Novozyme) @1×109 (3ml/l) with the earnings of Rs. 2.11.