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Agral amount appeared applied assimilation rate aucuba mosaic bacterium beds Biol caterpillars caused Cheshunt chrysanthemum CM CM colour Complete Artificials copper cryolite cucumber developed dried blood effect experimental experiments fertilisers flowers foliage formaldehyde fruit fumigation fungicides fungus germination glasshouse growers grown growth heating inches increase injury inoculated Investigations isolated leaf mould Leafy Gall leaves lettuce light intensity lime manure Manurial Treatment mosaic disease mottle naphthalene nitrate nitrogen normal O. B. Orchard obtained parasite period pest phosphates pipes plots potash pots Red Spider Mite roots Rose salicylanilide samples season seed seedlings shewed shewn soil temperature spores spotted wilt spraying stable manure steaming stem sterilised sterilized straw streak Stripe sulphur symptoms Table tested Thrips tissue tobacco tomato crop tomato houses Tomato Leaf Mould tomato mosaic tomato plants tons per acre variety virus virus diseases water-content winter yellow yield