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acid Agric appears appl applied attack beds Bewley Biol blooms Botrytis Botrytis cinerea Carnation caused Cheshunt Cheshunt Early Giant chlorate chrysanthemums colour Complete Artificials compost containing cucumber Cucumber virus cuttings derris dust eelworm effect emulsion Experimental experiments flowers foliage fumigation fungi fungicidal fungus Fusarium Gdnrs germination Glasshouse Glasshouse Crops growers grown growth hort inches infected injury inoculated insecticides investigation isolated large number larvae Leaf Mould leaves lettuce manure mixture mosaic mushrooms mycelium naphthalene nitrogen nurseries obtained oil emulsion P. H. Williams peat pest petals plots potash pots Pyrethrum red spider mite relation to Glasshouse Research Station rose Sciarid season seed seedlings shewed shewn sodium sodium fluoride Speyer spores spotted wilt spray stem sterilized strains streak sulphate of potash symptoms temperature tested Thrips Tomato Leaf Mould tomato plants tons per acre truss variety Verticillium Virus Diseases yield