1330 The Vegetable Industry i.\ New York 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 moisture favor the growth of the fungus. 



CORN 



Smut (Ustilago zeae Fng.). 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 



Wilt (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 



