Toxicity and selection of insectivides to Coccinella septempunctata(L.)and Brevicoryne brassicae(L.) Selective toxicity of three amide pesticides to black cutworm Agrotis ypsilon and earthworm Eisenia foetida Selective toxicity of seven neonicotinoid insecticides to fungus gnat Bradysia odoriphaga and earthworm Eisenia foetida Selective toxicity of insecticides between Aphis citricola and Coccinella septempunctala