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wind to other parts of the^ field, light on the plants, germinate, 

 enter and augment the disease. During the summer, new winter 

 spores are formed within the stems, leaves and tubers, completing 

 the life history. 



REMEDIES. 



The methods of treatment are direct and preventive, from the 

 fact that the parasite is internal and only appears at the surface 

 while producing summer spores. The methods must be largely 

 preventive. 



DIRECT METHODS. 



Any means by wLich the growth of the summer spores can be 

 checked, would prevent the spread of the disease from plant to 

 plant during the season, and prove beneficial. 



The following solutions have been tried in France and in New 

 Jersey with apparently satisfactory results and we would recom- 

 mend them for trial in Maine : 



SOLUTIONS. 



No. 1. — Mix 1 qt. of strong ammonia water (hartshorn) with 

 3 ozs. of carbonate of copper. Stir rapidly until a clear liquid is 

 produced. When ready to use it. dilute to 22 galons with water. 

 Apply with a spraying apparatus or force pump. 



No. 2. — Dissolve 1 lb. sulphate of copper (blue stone) in 2 

 gallons of hot water. When dissolved and cool add 1 1-2 pint- of 

 commercial ammonia water. Dilute to 22 gallons with water. 

 Apply as stated above. 



No. 3. — Dissolve 6 lbs. copper sulphate in 16 gallons water. 

 Shake 4 lbs. of fresh lime into 6 gallons of water. When cool 

 mix the above solutions slowly and thoroughly and apply as 

 stated above. 



NOTE . 



Any spraying apparatus will answ-er. Select the recipe for 

 which the material can be readily obtained. Spray as soon as the 

 disease begins to show as a whitish mildew, or the leaves begin to 

 blacken. We would be pleased to have a report from those who 

 try these mixtures. 



PREVENTIVE METHODS. 



1. Burn the tops and leaves in the fall after the crop is 

 gathered, to destroy the winter spores contained in them. 



2. Gather all the small potatoes, for if allowed to decay in 

 the field the winter spores in them will start the disease the 



