An Efficacy of Bio-Rational Pesticides for the Management of <i>Leucinoides Orbonalis </i> Guenee in Rupandehi, Nepal

Abstract

Field experiment was conducted from March to June, 2017 in field conditions at Institute of Agriculture and Animal Science (IAAS), Paklihawa Campus, Rupandehi, Nepal to evaluate the efficacy of botanicals, microbials and chemical insecticide against Leucinodes orbonalis Guenee. Seven treatments including untreated-control were assessed in randomized block design with four replications and two sprays. The treatments were i) Jholmal, 250 ml/l of water ii) Beauveria bassiana (Daman),4 g/l water iii) Abamectin 5% (Biotrine), 0.5 ml/l of water iv) Bacillus thuringiensis var. kurstaki (Mahastra), 4 gm/l of water v) Emamectin benzoate (Cobra) @ 0.5g/l of water vi) Azadirachtin 1500 PPM (Neem Kavach) @ 5 ml/l of water vii) Control (water application) which were evaluated for the management of L. orbonalis. All the treatments applied were superior to the control. The results revealed that, at 14 days after treatment, the lowest percentage of infected fruit i.e. 57.97% and 34.52% were found at 14 days after the first and second spray of Emamectin benzoate treatment respectively as well found to be significant over control in both sprays. The marketable yield of plot treated with Emamectin benzoate in eggplant was found to be the highest i.e.7.19 t/ha and 7.13 t/ha which was followed by Neem Kavach with the yield of 6.69 t/ha and 7.06 t/ha and that of control plots was 2.98 t/ha and 2.56 t/ha. Further, our study concluded both marketable yield and Benefit Cost (BC) ratio of brinjal fruit were the highest under the treatment Emamectin benzoate followed by jholmal and Neem Kavach. From this experiment, we concluded that Emamectin benzoate was the most effective treatment for the management of L. orbonalis while jholmal and Neem Kavach was proved to the best alternative.