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Agral appeared applied assimilation rate aucuba aucuba mosaic beds Bewley Biol Botrytis carnation caterpillars caused Cheshunt Chrysanthemum colour Complete Artificials copper crop cryolite cucumber developed dry weight eelworm effect emulsion experimental experiments fertilisers flowers foliage fruit fumigation fungicides fungus germination glasshouse growers grown growth healthy hoof and horn inches increase infected injury inoculated Investigations isolated larvae leaf mould Leafy Gall leaves lesions lettuce lime method mosaic disease mottle naphthalene nitrate nitrogen obtained occurred peat period pest phosphate pipes plots potash pots Red Spider Mite roots rose rose rust salicylanilide samples season seed seedlings shewed shewn soil temperature spores spotted wilt spraying stable manure steam stem sterilized straw Stripe sulphate of potash sulphur symptoms Table tested Thrips tomato houses Tomato Leaf Mould tomato mosaic tomato plants tons per acre truss variety Verticillium virus virus diseases winter yellow yield