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abnormal acidity agric Agricultural Ailsa Craig applied Broadbent carnation caused chemical Cheshunt chloropicrin chrysanthemum compost concentration cucumber culture daylength Department eelworm effect Experimental Horticulture Station experiments expressed sap Flegg flower fruit production fruit quality further G. F. Sheard G. W. Winsor glasshouse Glasshouse Crops Res growers grown growth Hollings Horticulture increased inoculated Institute investigation leaf lesions lettuce levels magnesium manganese manganese toxicity manure metham-sodium method methyl isothiocyanate Moneymaker mottle virus mushroom mycelium N. W. Hussey nitrate nitrogen nutrient nutritional trial obtained peat phosphate Phytopathology plots potash pots programme rate of fruit Red Spider Mite ringspot ripening roots samples seed seedlings showed soil spawn sporophores spraying steamed sterilisation strain sulphate symptoms temperature tion tips tobacco mosaic virus tomato tomato crops tomato fruit tomato mosaic tomato plants transmission treatments truss virus diseases viruses W. H. Read weeks yield