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