56 VEGETABLE GAKDENING. 



danger of the spores being spread over a larger 



area. 



FIG. 7. Potato tuber showing the rough, warty growth. 



When a first attack is discovered, the variety 

 should at once be lifted, and refuse and diseased 



FIG. 8. Potato stem warted above the 

 surface of the soil. 



tubers burnt on the ground to prevent as far as 

 possible the escape of spores into the soil. Appar- 



