IB 



CLUB ROOT OF CABBAGE. 



CLUB ROOT OF CABBAGE. 



Many market gardeners confound the work of the maggot 

 with diseases which affect the root and have no connection 

 whatever with the maggot. This is noticeably true of a form 

 of rot which sometimes affects the roots, causi ig wilting and 

 death of plant. Club Root, also, whicli appears to be on the 

 increase here, has been erroneously supposed by some to be 

 connected with the work of the maggot. On June 23rd Club 

 Root was found to be so bad on a certain field that the owner 

 expected to lose his entire crop of cabbages. Over a large part 

 of his place the plants were wilting, yellowing and dying. 

 The first indication that he had, so he reported, of their being 

 affected, was their wilting during warm days, and not recover- 

 ing at night. He first observed this on his place four years 

 ago. but did not recognize it, and took no measures against 



J"iG. 10.— Club- root of cabbage. (Author's ilkistration.) 



it. This disease of the cabbage, see photo, caused by a slime 

 mould, known as PlasmodropJwra brassicae, Wor., has 

 nothing to do with insects whatever, and is becoming quite 

 common in Minnesota. It also attacks radishes, turnips (par- 

 ticularly rutabagas), shepherd's purse, wild mustard, and 

 probably a number of cruciferous plants. The vitality of the 

 spores is such that manure from cows fed upon clubbed roots, 



