1330 Ture VecrerasLe Inpustry 1n New Yor«k State 
results are obtained only where spraying is begun as soon as the 
plants become established in the field and repeated at regular 
intervals throughout the season. Spray every ten days. 
Pink Rot (Sclerotinia libertiana Fuckel), Figs. 387 and 388. 
This fungous rot is sometimes very destructive to celery in 
trenches and rarely in cold storage. Many other rot fungi attack 
stored celery, but none cause such a rapid and complete decay. 
The disease is readily distinguished by the presence on softened 
parts of dense cottony wefts of mold, within which black irregular 
bodies 1/32 to 3/8 inch in diameter are developed. These are the 
resting bodies of the fungus and serve the purpose of seeds. The 
same fungus attacks lettuce, carrots, cabbage and other plants. 
It can always be distinguished by the mold and resting bodies. 
Control methods are uncertain. Probably much can be done to 
reduce the amount of disease on all attacked plants by diligently 
removing and destroying all diseased material bearing the fungus 
resting bodies. Celery trenches should be ventilated as much as 
possible, for heat and 1aoisture favor the growth of the fungus. 
CORN 
Smut (Ustilago zeae Ung.). The familiar smut boils occur 
on corn wherever it is grown and often results in noticeable 
losses. The causal fungus remains in the soil from year to year 
or is brought in with manure where infested corn is fed. The 
fungus is killed in silos. Crop rotation and the use of unin- 
fested manure reduces the disease. Go through the fields several 
times each year and cut out and burn the smut boils before they 
burst open. This continued yearly will result in continued dimi- 
nution of smut. 
CUCUMBER 
Wut (Bacillus tracheiphilus Erw. Smith), Fig. 389. Usually 
whole plants show a rather sudden wilting with no apparent cause. 
The disease results from the clogging of the water vessels of the 
plant by a bacterium, which gains entrance to healthy plants 
largely through the feeding punctures of striped beetles and other 
insects. Cantaloupes, pumpkins and squashes are also subject to 
the disease. Sure methods of control are unknown, but it is 
probable that crop rotation, the early removal and destruction of 
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