228 



FRUIT INSECTS 



migrate to new leaves and there start new blisters. Repro- 

 duction is continuous and new galls are formed throughout 

 the growing season. 



Fig. 206. — Pear leaves infested with the pear-leaf blister-mite. 



On pear the blisters at first appear as small greenish pimples 

 which soon take on a reddish color and later turn brownish. 



On apple the first 

 stages are pale yel- 

 lowish and the blisters 

 never become as red 

 as on pear. They are 

 I inch or less in diam- 

 eter, and when abun- 

 dant coalesce, produc- 

 ing large dead areas in 



Fig. 207. — Pear-leaf blister-mite, greatly en- 

 larged. 



the leaves. Badly infested leaves are liable to turn yellow and 

 drop. The loss of foliage weakens the tree, interferes with 

 the maturing of the fruit and the formation of fruit buds. 



