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acid Ailsa Craig allow appear applied attack become boxes brown cause cent Cheshunt colour compost cresylic acid crop cucumber cultivation dibber disease Eelworm effect favour fertilizer fillis flowers foliage formaldehyde fruit fumigation fungus glasshouse green growers growing grown growth gutter heated heavy soils henbane herb high temperatures horse manure important inches infection injury layer Leaf Mould leaves light method Mite mixture moist naphthalene necessary nitrogen nurseries obtained overhead damping peat pest picked pipe pollen potash pots prevent produced propagating house purlin Red Spider Mite root development rows season seed seedlings side shoots sowing sown spraying steam stem sterilized straw subsoil sufficient suitable sulphate of potash Superphosphate supply surface Thrips tomato tomato plant tons per acre treatment truss usually variety ventilation vitamin White Fly Wilt winter wires Wireworms Woodlice yellow young plants