Comparative Efficacy of Bio-Pesticide and Synthetic Agrochemicals on Population Control of Aphids, Helicoverpa Armigera, Infestation Control and Yield of Okra: Population Control of Aphids, Helicoverpa Armigera. Pakistan Journal of Scientific & Industrial Research 2020, 63 (3), 207-213. https://doi.org/10.52763/PJSIR.BIOL.SCI.63.3.2020.207.213.