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acid Agricultural Ailsa Craig aluminium breeding Broadbent bulbs carnation chemical chrysanthemums commercial compost concentration cucumber cultures daylength decreased diazinon dichlorvos dinocap disease eelworm effect Experimental Horticulture Stations experiments factors fertiliser flowers foliage fruit set fungicides further Fusarium G. F. Sheard gene germination glasshouse Glasshouse Crops Res growers growth Hollings Horticulture increased infected inoculated insecticide Institute investigated isolated larvae leaf lettuce levels of nitrogen lime Littlehampton M.I.Biol manganese method mildew mottle mushroom narcissus nitrate nitrogen nursery nutritional trial obtained Petal Blight phorate Phorids phosphate phosphorus plots pollen potash potassium pots problems produced programme Red Spider Mite Report resistance ringspot ripening samples season seed seedlings showed soil spawns species spores sporophores sprayed stage steam sterilisation Stockbridge House strains symptoms temperature tested tetradifon tomato tomato fruit toxicity treatment truss tulip varieties Verticillium viruses wilt yield zineb