84 VEGETABLE GAKDENING. 



of spores, which further contaminate the soil. It 

 thrives in an acid soil, and is decreased by an ample 

 supply of lime. 



Treatment. (1) On removing an affected crop, all 

 roots and diseased material should be collected and 

 burned ; (2) avoid, if possible, growing a cruciferous 

 crop on the same ground for a few years ; (3) after 

 digging the ground apply a heavy dressing of freshly- 

 burnt lime, at double the rate recommended for 

 ordinary purposes ; the following year dress heavily 

 with basic slag, and the year after give a normal 

 application of lime. 



