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aphids apothecia appearance areas attack Auckland bacterium big-vein Bordeaux mixture Botrytis brown captan cause chloropicrin CONTROL MEASURES Crop rotation cucumber mosaic virus damage damping damping-off dead tissue decaying develop diseases and pests disinfected Downy mildew dust Endt Fig FACTORS FAVOURING INFECTION ferbam fungi fungus germination ground level H. E. Powell host plants Imperial 615 infected lettuce infected plants INFECTION AND SPREAD Infection on lettuce insect pests J. W. Endt Lactuca large numbers lettuce crops Lettuce mosaic Lettuce mosaic virus lettuce plants Marginal leaf-spot METHOD OF SPREAD mycelium nasturtium outer leaves Pests of Lettuce Photo S. A. Plant Diseases Division plant therapeutants pre-emergence Ring spot Rumsey Fig S. A. Rumsey sclerotia Sclerotinia rot season seed beds seedlings severe infection Soft rot bacteria sources of infection spores spotted wilt spray Spread of infection stem susceptible SYMPTOMS thiram thrips tomato vectors virus diseases weeds wide host range Zealand zineb