DiIsEAsES OF VEGETABLES 1333 
diseased plants, and the control of striped beetles and other insect 
enemies are of value. 
Downy Mildew (Plasmopora cubensis Humphrey), Fig. 390. 
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 
Fic. 389.— 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 spraving as for downy mildew. 
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