Diseases of Plants 



289 



R. F. Poole, N. J. Expt. Sta. 

 FIG. 164. Cabbage plants badly infected with the club root disease. 



such crops and of the various means that are employed 

 in combating them. 



CLUBROOT OF CABBAGE 



All the members of the cabbage group, as well as 

 turnips, radishes, rutabagas, and mustards, serve as the 

 hosts of a parasite which causes a disease known as club- 

 root. This disease is especially common in cabbage over 

 most of the United States east of the Mississippi River. 

 Young plants are often attacked in the seed bed. They 

 become stunted and sickly and seldom grow to maturity. 

 They wilt during the heat of the day. The roots soon 

 become greatly swollen and misshapen. This condition 

 leads the gardener to speak of the disease as the club- 



