INSECTS INJURIOUS TO THE APPLE AND PEAR 565 



and become a light brown or dark green color on the upper leaf 

 surface and uniformly brown beneath, looking something like 

 the work of the apple rust. The young fruit is sometimes attacked, 

 on which small green pimples, which later make blister-like spots 

 or pock marks, are made toward the blossom ends, but which 

 do not seem to cause much damage. 



i 



FIG. 501. Old leaf cluster with galls of pear leaf blister-mite on apple fruit 

 and leaves. (After Parrott, Hodgkiss and Schoene.) 



Control. The mites may be controlled by spraying with 

 10 per cent kerosene emulsion, miscible oils, or lime-sulfur wash 

 used the same as for the San Jose scale. Spraying should be 

 done in October or November as soon as possible after a majority 

 of the leaves have fallen, as many of the mites are still in the 

 pubescence of the young wood, where they are more easily de- 



