1 18 FUNGOUS DISEASES. 



bages, or any allied crop, should not be upon the soil 

 oftener than once in three years. Cabbage, kale, 

 Brussels sprouts, kohl-rabi, turnips or radishes 

 should not follow each other, if club root is preva- 

 lent in the ground. 



It is possible to get relief by the use of some of 

 the commercial fertilizers; but this needs confirma- 

 tion through trial. It is a fact that is being acted 

 upon in some of the large truck regions near New 

 York, that lime is an effective preventive of the club 

 root, and, by its constant use, at the rate of seventy- 

 five bushels or so per acre each year, cabbages have 

 been grown at frequent intervals almost yearly upon 

 the same soil. It is likely that a soil naturally 

 abounding in lime may be the best suited for crucif- 

 erous crops, so far as club root is concerned. Lastly, 

 it has been shown that common cruciferous weeds 

 harbor the fungus enemy, and; while the farmer may 

 be thankful for the loss of his hedge mustard and 

 shepherd's purse, through "clubbing," this is a case 

 where such weeds can be more cheaply destroyed in 

 some other way. 



In a special bulletin of the New Jersey agricul- 

 tural experiment station, Dr. Halsted summarizes 

 the conclusions derived from the latest experiments 

 and investigations as follows: 



Thirty-five to fifty bushels of air-slaked lime, 

 when applied to the surface of the soil, preferably 

 the preceding season, and worked in, is a practical 

 remedy for club root. 



Gas lime, kainit, wood ashes, copper sulphate, 

 corrosive sublimate, salt, sulphur, calcium carbonate 

 and sodium carbonate have all proved unsatisfactory 

 as remedies for club root. 



