Field evaluation of some insecticides and bio-pesticide against tur pod bug, Clavigralla gibbosa (Spinola) in long duration pigeonpea

Abstract

The study was carried out to evaluate some insecticides against tur pod bug, Clavigralla gibbosa (Spinola) in long duration pigeonpea during kharif 2009-2010 and 2010-2011 at Agriculture Research Farm, Banaras Hindu University, Varanasi. The results revealed that there was a significant difference in percentage population reduction at every observation days. The mean percentage population reduction from spinosad was ranged from 89.85% after first spray (2009-10) to 94.49% after first spray during 2010-2011. The relative performance of various insecticides was found in order of spinosad 45% SC at 73 g a.i./ha > indoxacarb 14.5 SC at 60 g a.i./ha > monocrotophos 36 SL > endosulfan 35 EC > dimethoate 30 EC > NSKE-5%. The highest pod damage by pod bug was recorded in the plot treated with B. bassiana at 1.5 kg/ha (14.23%) which is at par with NSKE-5% (14.21%). Highest incremental benefit: cost ratio of 13.23 was recorded in case of spinosad 45% SC followed by NSKE-5% (9.99:1) and indoxacarb 14.5% SC (9.48:1). The lowest benefit cost ratio (4.74:1) was recorded in Beauveria bassiana treated plot. It was in the range of 5.24 in dimethoate 30 EC to 8.40 in endosulfon 35 EC. Highest incremental benefit: Cost ratio of 13.23 was recorded in case of spinosad 45% SC followed by NSKE-5% (9.99:1) and indoxacarb 14.5% SC (9.48:1). The lowest benefit cost ratio (4.74:1) was recorded in Beauveria bassiana treated plot. Key words: Clavigralla gibbosa, pod damage, Beauveria bassiana and insecticides.