EXPERIMENT STATION BULLETINS. 



277 



Fig. 6. — Cabbage Leaf affected with Black Rot, Water Pore infection. 



Yorli Station Bulletin No. 232.) 



(Stewart and Harding. New 



There is no question but that in many cases the plants are taken from the 

 seed bed in a diseased condition and when transplanted into the field spread 

 the germs through the soil rendering it unfit for cabbage growing in the future. 

 When the source of the infection is confined to such a limited space as the seed 

 bed, it is possible to sterilize the soil to depth of five or six inches by covering 

 it with brush and cord wood and burning it, the heat produced penetrating 

 suflBciently deep to kill most of the surface bacteria as well as troublesome weed 

 seeds. This is a very common practice with tobacco growers and has met with 

 great success wherever employed. If this is not practicable, the seed bed should 

 be located in a new place each year and where cabbage has never been grown. 

 It is only reasonable to suppose if your plants are in a good vigorous condition 

 when transplanted into a "healthful" field, their chance of living is vastly greater 

 than if sick from the start. 



