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7th British Insecticide acaricides activity Agricultural Aldicarb aldrin aphid apple areas attack bananas barley bean aphid benomyl biological Busan Busan 30 cabbage cabbage root fly carrot fly caused cereal chemical chlorfenvinphos commodities compounds concentration cultivars cyst-nematodes damage degradation diazinon dieldrin economic effects efficiency El-Nawawy evaporation factors farmers fenamiphos field foliar forecast fruit fumigants fungi Fungicide Conference 1973 fungicides fungus Fusarium growers growth important increase industry infected Insecticide and Fungicide insecticides isolated isothiouronium leaf lettuce levels loss lycopersici methods methyl bromide microbial mildew nematicides nematodes onion OOT OOT organic oxysporum pathogens pesticides phorate Phytopathology phytotoxicity Plant Pathology population potato potential problems Proceedings 7th British programme ptre residues resistance roots Rothamsted salts seed treatment seedlings sodium soil soil-borne solani species spray stem sterile storage susceptible Table temperature tomato toxicity translocated uptake wilt yield