FUNGOUS DISEASES AND SPRAYING 63 



CHERRY 



For diseases of cherry and their treatment see Plum. 



CORN 



Corn Smut. Grayish white swellings on almost any part of 

 the plant which develop into black powdery spore masses. 



Treatment. No practical method of prevention has been 

 demonstrated. The recommendations are to plant the least 

 susceptible varieties, and to gather and destroy the spore 

 masses. 



CUCUMBER 



Downy Mildew. Attacks leaves, which show yellow spots 

 with mold-like growth on the under side ; spots turn brown and 

 the leaf soon dies. 



Treatment. Spray with Bordeaux mixture about the middle 

 of July and repeat every ten days. 



During the past two seasons this disease has been very 

 serious. The cucumbers in the Experiment Station garden in 

 1902 were sprayed five times and remained healthy until killed 

 by frost. Unsprayed vines died two to three weeks earlier. 

 The disease made its appearance considerably later than the 

 previous year ; not until after the middle of August. 



GRAPE 



Downy Mildew and Brown Rot. This disease receives the 

 former name when attacking the leaves, the latter when at- 

 tacking the fruit. On leaves, yellowish spots covered on the 

 under side with whitish downy mold-like growth ; leaves soon 

 die and drop off. On fruit, later turning gray from develop- 

 ment of spores. 



Treatment. Spray with Bordeaux mixture just before leaf 

 buds open, again just before flower buds open, a third time 

 as soon as the fruit has set, a fourth time two weeks later, 

 using copper carbonate solution instead of Bordeaux ; it may be 

 advisable to spray again with copper carbonate when the fruit 

 is beginning to color. 



Black Rot. Reddish brown spots on leaves. Grapes turn 

 brown, finallv black ; becomes dry and shriveled with sharp 



