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. doi:10.52763/PJSIR.BIOL.SCI.63.3.2020.207.213