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.