Apple and Thorn Skeletonizer 



Hemerophila pariana Clerck 

 Work on apple leaves. The lower left-hand leaf shows a littk 

 feeding, the upper left-hand one a somewhat characteristic condi- 

 tion on moderately infested trees, the upper right-hand leaf a more 

 advanced stage of injury and the lower right-hand leaf practically 

 completed skeletonizing with a somewhat characteristic rolled 

 margin. (Author's illustration from Cornell University Extension 

 Bulletin 27) 



208 



