Diseases of Vegetables 



L333 



diseased plants, and the control of striped beetles and other insect 

 enemies are of value. 



Downy Mildew (Plasmopqra cubensis Humphrey), Fig. .">!)0. 

 This is a very destructive disease to both cucumbers and canta- 

 loupes in regions where it commonly occurs, but outside of Long 

 Island it seems to appear only occasionally in this state. The first 



Fig. 3S9. — Cucumber Wilt 



symptom is the appearance of yellowish angular spots in the older 

 leaves, which increase in number and size, spreading to younger 

 leaves and finally killing practically all leaves. 



Thorough spraying with bordeaux, 5-5-50, controls the disease 

 and is very profitable where it is destructive. Begin spraying 

 when the vines begin to run and repeat every week or ten days 

 throughout the season. There is little use to begin spraying after 

 the disease appears. 



Leaf and Fruit Spot Diseases. There are several distinct 

 diseases, resulting from the attacks of several species of fungi, 

 which cause dead spots in leaves and fruits. Wherever suffi- 

 ciently destructive to warrant control measures, all can be pre- 

 vented by spraying as for downy mildew. 



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