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10-percent parathion 5-percent TEPP aerosol acre Agriculture Anthracnose aphid bottom rot Cabbage looper caused connection for attachment cover crop of lettuce cubic feet cultivation Diseases of Greenhouse dormant lettuce seed Downy Mildew equipment favor feet of greenhouse field-grown flats foliage forcing crops fungus Garden symphylid germinate Grand Rapids Gray mold greenhouse beds greenhouse lettuce greenhouse space Greenhouse whitefly greenhouse-vegetable ground burned limestone ground limestone growers growing conditions GROWING LETTUCE grown under glass harvest head lettuce inches in diameter infestations insecticide INTERCROPPING large ranges leaf LETTUCE IN GREENHOUSES lettuce plants lettuce varieties lime malathion manure moisture Muck nitrate of soda nitrogen Number organic matter packed parathion aerosol perature plant bed pound of solution production roots rotated sclerotia seedlings snails soil sterilization Sowbugs spray starting the plants strain subirrigation sulfate of ammonia temperatures tipburn tomatoes or cucumbers transplanting Two-spotted spider mite U. S. Dept usually vegetable-forcing crops ventilation