The impact of several insecticides against the legume pod borer, Maruca vitrata Fab. (Lepidoptera: Crambidae) on cowpea

Abstract

Among several grain legume crops, cowpea (Vigna unguiculata) belongs to family Fabaceae is also a highly grown legume crop in Nepal. But M. Vitrata (LPB) is found to be one of the major pests hindering and confining the production and productivity of cowpea crops. Therefore, this research was conducted to explores the best insecticides that control this pest up to the highest extent. The research was laid out in RCBD design with seven treatments and three replications in the field of Katari, Morang. The treatments comprise chlorantraniripole 18.5% SC, Emamectin benzoate 5% SG, Spinotoram 11.7% SC, Dimethoate 30% EC, Azadiractin 0.07 % EC and BT+ Saccharopolyspora spinosa and control. The research demonstrated the minimum or least infestation in the plot treated with chlorantraniripole 18.5% SC (1.65%), followed by Emamectin (3.12), benzoate 5% SG and Spinotoram 11.7 % SC (3.22%). The highest or maximum infestation was observed in the controlled plot followed by the plots treated with Neem. The highest yield was recorded by treatments with chlor-(13mt/ha) followed by EB (12.90 Mt/ha), Spin (12.89) and lowest in control (4.70 Mt/ha).