79 



Dwarfing Effect of Attacks of Mites of the Genus 

 Eriophyes Upon Norway Maples. 



Howard E. Enders, Purdue University. 



The peculiar dwarfed and somewhat blighted condition of a portion 

 of the branches of Norway maple trees in and about the town of Her- 

 shey, Pennsylvania, attracted my attention during August of 1917, and 

 an effort was made to determine the cause of this condition. The gen- 



Fig. 1. Norway maple infested with mites (Eriophyes) for a period of at least 

 three years. Its stunted growth is suggestive of excessive trimming. 



