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acid Agric alginate ammonia antibiotic antibiotic substance appeared Appl applied aucuba azobenzene BEWLEY Biol Blotchy Carnation caterpillars cent Cheshunt Chron colour compost concentration containing cotyledons cucumber culture Didymella Disease dried blood ecdysis eelworm effect eggs experiments females fertilisers flies flowers foliage fruit fungi fungus given in Table glasshouse glucose growth heat treatment hoof and horn incubation infection inoculated insecticide instar isolated larva larvæ leaf leaflets leaves lesions males method mites mosaic virus moths nitrate nitrification nitrogen nursery obtained parasites parathion patulum period phosphate plots potash pots powder production puparia red spider red spider mite rhizosphere roots samples seed showed sodium alginate solution species SPEYER spores sprayed stable manure steamed soil stem sterilised sterilized sugar beet pulp sulphate superphosphate surface symptoms temperature tobacco mosaic virus tomato tomato plants tomato seedlings unsteamed urea variety weeks wheat straw yield