IP Nov.. 1909. I rnh Potato Blight and its Treatment. 699' 



2. As the spores of the fungus, which are equivalent, as far as repro- 

 duction is concerned, to the seeds of higher plants, mav sometimes occur 

 on the surface of the tubers, it mav he necessarv to disinfect them. 



POTATO LEAF (UNDER SURFACE) SHOWING EARLY STAGE OF DISEASE. 



3. As the fungus causing the disease is produced from spores, if these 

 spores, falling on the leaves of healthy plants are prevented from ger- 

 minating there, or if the spores falling on the soil are prevented from 

 reaching the tubers, then the disease would be nipped in the bud. 



If the spores have once germinated and infected the potato plant by 

 reaching the interior, then there are no means known of dealing with it. 

 It is prevention, and not cure, which is attempted. 



Disease-proof potatoes are also sometimes placed upon the market, but 

 while some varieties are less susceptible to the disease than others for a 



