THE APPLE-SUCKER. 



27? 



10-jointed antenna, which end in two short slender bristles. 

 Unlike plant-lice, they have three ocelli, and their legs are 

 formed for leaping in the adults. They live upon the sap, and 

 discharge a fluid in the form of small globules, which are 

 attached by a thread to the tail end of the Psylla. The larvae 

 are often protected by a cottony secretion as well. 



The species infesting the apple is found early in the year 



Fig. 1.57. — Apple-.sucker (Psylla mdli). 

 1 and la, Pupa, nat. size, and inag. ; 2 and 2a, imago, nat. size, and mag. (Whitehead.) 



in the folds of the buds, and there in their immature form they 

 suck the sap and prevent the leaves and blossom from develop- 

 ing. The larvce are flattish creatures which we find in the 

 buds, having crawled thither after their exit from the egg. 

 They also block up the buds with their honey dew. They are 

 dark brown and greenish in colour, with red eyes. A true 

 pupal stage is assumed, bud-like wings appearing, until by the 



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