BLISTER-MITES AND LEAF-MINERS 



309 



Fig. 471. — Apples deformed by the Pear-leaf Blister-mite. Original. 



Treatment consists in spraying in winter with lime-sulphur solution, 

 so as to kill the hibernating mites. In summer they cannot be reached 

 by any spray material because of their feeding habits. 



The Apple Leaf Trumpet Miner 

 (Tischeria malifoliella Clem.) 



Characteristic, trumpet-shaped 

 mines in the upper surface of 

 apple leaves indicate the presence 

 of this insect. Usually the mines 

 are not more than a half inch 

 long, beginning with a quite nar- 

 row brown or dead area and en- 

 larging rapidly to their maximum 

 width. 



There are from two to four 

 generations annually. The winter 

 is passed by the full-grown larva 

 in its mine in fallen leaves. The 

 tiny adult moths emerge in the spring with the expanding of apple 

 foliage. 



Fig. 472. — Work of the Apple Leaf 

 Trumpet Miner. Original. 



