Insecticidal Effects of Extracts from Polygonum orientale L. and Their Action Ways against Mythimna separate Walker Studies on insecticidal activities of 13 species of Celastraceae Insecticidal Activity of Basidiomycete Scleroderma citrinum Antifeedant Activities and Effects of Tutin and Its Derivatives on Mythimna separate (Lepidoptera: Noctuidae) and Its Physiological Parameters Insecticidal activity of total alkaloid from Tripterygium wilfordii Hook against Mythimna separate