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Visalakshmi, V and Ranga Rao, G V and Arjuna Rao, P (2006) Effect of helicoverpa nuclear polyhedrosis virus (HNPV) on different life stages of Helicoverpa armigera (Lepidoptera:Noctuidae). Indian Journal of Plant Protection, 34 (2). pp. 242-244. ISSN 0253-4355