Widespread but minor because of the use cf resistant varieties. 
Virus diseases, especially mosaic, occur wherever peas are growmm 
and cause appreciable damage. Root-knot injury is most severe 
on light scils in the South and parts of Californie. 
The reot rots are difficult to control, but losses can be reduced 
by crop rotetion and plenting on well-drained scils. The use of 
clean, western-grown seed treated with a fumgicide, plus crop rota- 
tion, is the only means of controlling ascochyta and bacterial 
blights, Fusarium wilt is controlled by use of resistant varieties, 
and varieties resistant to the form known as near=wilt are being 
developed. Virus diseases are not successfully controlled. 
Peppers, Green 
Diseases losses of peppers are due principally tc lesf spots, fruit 
spots and rets, end mosaic virus infections. Bacterial spot causes 
a partially defcliating leaf spot and a spotting of the fruits. 
Cercospora leaf spot causes a drop of severely infected leaves, but 
does not spot the fruit, Anthracnose fruit rot causes less damage 
than the leaf spots, but is of economic importence. Tobacco mosaic 
virus is a major cause of loss. Cucumber mossic virus alse causes 
a stunting and reduction of yield im peppers. Southern blight 
causes minor loss, es do bacter’al wilt end the root-knot nematode, 
Plosson-end ret of the fruit, a nonnaresitic disexzse, also causes 
sone loss. 
Leaf spots and fruit rets occur wherever peppers are grown in 
humid areas, Virus disesses and blessom—-end rot are present in all 
pepper-growing sections. The wilt diseases and root-knot injury 
are most prevaient in the South. 
Seed disinfection and crop retation help to reduce lesses from 
leaf spot diseases, but fungicides applied as sprays have not been 
very effective. Anthracnose and virus diseases have not been 
satisfactorily controlled, although verieties resistant to tobacco 
moseic virus have been developed. Rotation is the only means of 
avoiding losses from wilts and nematode injury. Littie can be. done 
to centrol blossom—end rot, since it is caused by a deficiency of 
soil moisture. 
Potatoes 
Potatoes are severely affected by disease in the field. Late blight 
causes foliage injury and tuber rot, which is a major cause of loss 
in many of the large producing areas in the Central and Atlantic 
States, and also at times in some sections of California. Early 
blight damages foliege and also causes some tuber injury wherever 
potatoes are grown in hunid areas. It appreaches late blight in re- 
Cucticn of the crop. Scab is another major source of loss except on 
highly acid soils. It occurs wherever potatoes are grown and causes 
a pitting and scabby condition cn the surface of the tubers that 
sete 
