216 VEGETABLE FOES AND DISEASES 



ventive of clubbing on infected land, thus enabling the 

 cultivators to grow Brassicas at frequent intervals 

 almost yearly upon the same soil, as the applica- 

 tions of gas lime, and also of quick lime, destroy the 

 germs of the disease in the soil. 



From the nature of the disease it is simply solicit- 

 ing attack to sow or plant Cabbages, Turnips, etc., in 

 affected soil, hence it is imperative to disinfect such 

 soil, either with lime or gas lime, before the land is 

 again cropped with Brassicas. 



As the slime-fungus requires an acid medium for 

 proper development, manures soaked with sulphuric 

 acid, such as superphosphate and dissolved bones, should 

 not be used, for the acidity, especially that of sulphur, 

 favours the spread of the disease. 



Clean culture is also important. Never tolerate 

 such weeds as Charlock, Garlic, Mustard, Shepherd's 

 Purse, and other crucifers where cultivated plants of 

 the Order Cruciferas are grown, for they may render 

 the land foul, even when under other crops, and when 

 Cabbages, Turnips, etc., are sown or planted these 

 become infected. 



All diseased plants should be collected and burned, 

 not throwing them on the manure heap to start the 

 disease anew, or even in a new locality where the 

 manure is applied. Too much care cannot be exer- 

 cised with regard to infection by introducing soil on 

 cart or barrow wheels, tools, etc., from an infected field 

 or garden to a new locality, as this is sufficient to start 

 the disease. 



