216 



DISEASES OF ECONOMIC PLANTS 



the diseased spots are angular, limited by the veins, pale 

 yellow, and the tissue is somewhat shrunken. 



The disease is common to cabbage, coUards, cauliflowers. 



turnips, radish, and many other 



numbers of the cress 

 family. It has been re- 

 ported in several states, 

 notably Ohio, New Jer- 

 sey, New York, Dela- 

 ware, Maryland, South 

 Carolina, North Caro- 

 lina, West Virginia. 

 Though it is seldom of 

 importance in the field, 

 it occasionally does 

 damage in the seed bed. 

 Spraying the seed bed 

 with Bordeaux mixture 

 will hold the disease in 

 check. Diseased plants 

 should be destroyed by 

 fire as soon as the bed 

 has been used. 



Powdery mildew. 

 See turnip. 



Soft rot. See cauli- 

 flower. 

 White rust (Albugo Candida (Pers.) Ktz.). — This 

 white rust is similar in appearance to that described 

 upon the beet. It has not often been reported as a pest. 

 Wilt, fusariose (Fusarium sp.). — This wilt of cabbage, 

 commonly known in the South as yellow sides, is very 



98. — Seedling cabbage plant spotted with 

 downy mildew. Original. 



