mosaic is a major cause of loss in many cucumber-growing areas. 
Scab is troublesome chiefly in the northern tier of States from 
Minnesota to Maine, but occurs on fall cucumbers in North Carolina 
and causes minor loss in New Jersey and Maryland. Root—-knot nema- 
tode losses are most heavy in the South. 
Downy mildew, anthracnose, and angular leaf spot can be controlled 
fairly effectively by the application of fungicides. Seed treatment 
and rotation also are valuable in control of anthracnose and angular 
leaf spot. Varieties resistant to scab have been introduced, but 
control of scab on slicing cucumbers is still a difficult problem. 
Bacterial wilt rarely causes severe damage in any one field, and it 
can be controlled only by using insecticides to destroy the cucumber 
beetles that disseminate it. Losses from mosaic can be reduced by 
eradicating perennial weed hosts and use of resistant varieties. 
Rotation is the only means generally used for root-knot nematode 
control. 
Cucumbers for Pickling 
The major losses of cucumbers grown for pickling are caused by 
the cucumber mosaic virus and scab. Downy mildew, anthracnose leaf 
blight and fruit rot, and bacterial wilt cause minor losses. Root-~ 
knot nematodes cause considerable damage in the South. 
About 60 percent of the pickling cucumbers are grown in the North 
Central States, particularly Michigan, Wisconsin, Indiana, Ohio, 
Minnesota, and Tlinois. Another 25 percent are grown in Maryland, 
North and South Carolina, Georgia, Alabama, and Mississippi. Cali- 
fornia, Colorado, and Oregon produce most of the western crop. The 
relative importance of the various diseases is determined by the 
location. Mosaic is particularly prevalent in the North Central 
States. Bacterial wilt also is common there, but is rarely found 
in the South. Scab is very damaging in the northern tier of States 
from Minnesota to Maine, where large acreages of pickling cucumbers 
are grown, but is of little general importance farther South. 
Downy mildew is confined to the Atlantic Seaboard, and root—-knot 
nematodes are most prevalent in the South. 
Losses from mosaic and scab are likely to be reduced by the recent 
introduction of resistant varieties. Downy mildew and anthracnose 
can be fairly well controlled with fungicides. Rotation is still 
the chief means of reducing loss from root-knot nematodes, 
Eggplant 
The most important disease of eggplant is the fruit rot and leaf 
blights wnich occurs wherever the crop is grown, but is most damaging 
in the South. The crop in the South is also damaged by a killing of 
leaves and young branches by sclerotinis fungi, as well as by root- 
See 
