MICHIGAN ACADEMY OF SCtENCR. 343 



SUMMAUT. 



The extent of certain important Michij^an crop losses due to diseases so 

 far as the records of the department show are here recorded. It is evident 

 from the foregoing brief aocoimt that plant diseases are an extremely important 

 factor in food prodtiotion. 



rittte XV. Kffect of hot wlmlfl upon appir. 



