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LIST OF PHOTOGRAPHIC ILLUSTRATIONS
LIST OF LINE DRAWINGS
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60 pots acid Ailsa Craig allowed ammonia applied beds boiler Botrytis bottom boxes buds bulbs carnations cent Cheshunt chrysanthemums clean colour commercial compost covered cresylic acid crop cucumber cultivation develop disease early eelworm effect fertilizer flowers foliage formaldehyde fruit gallons glass glasshouse growers growing grown growth gutter heat heavy Hoddesdon horse manure houses important increased infection land later layer Lea Valley leaf mould leaves lettuce light lime loam material method mixture moist necessary night temperature nitrogen nursery packed peat phosphate phosphoric acid pipes placed potash produce propagating red spider mite roots rows sand seedlings seeds side shoots soil sowing sown spray steam stem sterilized straw sufficient suitable sulphate of potash superphosphate supply surface taken tomato tons per acre top dressing treatment truss usually varieties ventilation weather weeks winter wireworms yellow young plants