PJB-2020-213
EFFICACY OF DIFFERENT INSECTICIDES AGAINST GRAM POD BORER AND THEIR SAFETY TO THE BENEFICIAL FAUNA
Arzlan Abbas
Abstract
Gram pod borer (Helicoverpa armigera) is a cosmopolitan pest of Chickpea and other crops like cotton, sorghum and pea etc. The pest mostly attacks on young pods by making holes in pods which results in absence of seed. The objective of this field study is to determine the comparative efficacy of eight different insecticides viz; Novaluron 10 EC, Flubendiamide 480 SC, Emmamectin benzoate 1.9 EC, Lufenuron 5% EC, Bifenthrin 10 EC, Bacillus thuringensis (Bt), Spinosad 240 SC and Spinetoram 120 SC against the larval population of Helicoverpa armigera and their safety to the beneficial insects on chickpea in the experimental area of Entomological Research Institute, Faisalabad, Pakistan during Rabi season 2019. The efficacy of the insecticides was determined by comparing treated plots with the control plots. One pre-treatment and three post-treatment observations were taken at the interval of 3, 7 and 14 days. After 3 days interval, insecticidal application of Bifenthrin and Emmamectin benzoate showed highest reduction of the larval population (86.53%, 76.80%), after 7 days’ interval, insecticidal application of Bt., and Lufenuron showed highest mortality percentages (84.97%, 77.33%) and then after 14 days’ interval with the application of Bt and Lufenuron following mortality percentages (76.47%, 68.33%) of the larva were recorded. In the same way, survival percentages of the beneficial fauna were recorded. After 3 days, Lufenuron and Spinetoram gives highest population survival of the beneficial insects as compared to the other insecticides. After 7 days and 14 days Bt and Spinetoram showed the highest survival percentages. All the insecticides resulted in significantly reduced the larval population density of the pest and also have less effect on the survival of their beneficial insects. Considering the results of the experiment Bacillus thuringensis, Bifenthrin and Lufenuron found to be the most effective insecticide while Novaluron and Flubendiamide are least effective insecticides for the control of Helicoverpa armigera. Key Words: Chickpea, H. armigera, Bifenthrin, Efficacy, Mortality, Survival.
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