2l6 MAINE AGRICULTURAL EXPERIMENT STATION. I914. 



a supply of seed tubers which show no evidence of sclerotia of 

 the fungus on their surfaces should be secured, if possible. For 

 a seed disinfectant before planting, corrosive sublimate should 

 be used. This has certain disadvantages but it appears to be the 

 most effective agent for destroying the fungus upon the tubers 

 that has yet been found and it is equally as efficient as formalde- 

 hyde for treating potatoes for scab. No doubt the fungus lives 

 over year after year in the soil without the presence of a crop of 

 potatoes for it readily grows as a saprophyte and is a parasite 

 on a wide range of unrelated hosts. However, rotation of 

 crops and allowing as long a time to elapse as possible between 

 successive crops of potatoes is desirable. Planting crops of 

 potatoes on the same land two years or more in succession 

 should not be practiced. 



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