1034 



THE FRUIT INDUSTRY IN XEW YORK STATE 



FIG. 313. THE GREEN FRUIT WORM: (1) CATERPILLARS EATING YOUNG 

 PEAR; (2) MATURE PEAR SHOWING EFFECTS OF INJURY 



once they have acquired a taste for the young fruits. They are, 

 however, much less destructive in orchards that are well sprayed 

 each year and given careful attention in other respects. Observa- 

 tions indicate that the most satisfactory means of protecting the 

 crop is thorough spraying with arsenicals before blossoming and 

 after petals drop. Cultivation is unquestionably fatal to many 

 of the pupae in the ground. 



INSECTS THAT ATTACK THE FOLIAGE 



The Pear Psylla 



Probably the most troublesome insect attacking the pear is the 

 pear psylla, Psylla pyricola Forster. These tiny insects are simi- 

 lar in many ways to aphides and are sometimes called jumping 

 plant lice. Like plant lice, they are sucking insects, and multiply 

 rapidly, so that unless checked, they make up in numbers what 

 they lack in size and may injure the trees very severely. A number 

 of broods are produced in summer, and the adults that live through 



