54 INSECTS OF ECONOMIC IMPORTANCE 



pit and feed on kernel ; chang-e to pupce in pits and 

 beetles emerge in August and September ; principal 

 injury caused by punctures made by beetles in feed- 

 ing and egg-laying. 



Control — Probably thorough spraying with ar- 

 senate of lead will be effective. The first appli- 

 cation should be made just before the blossoms 

 open. 



OTHER INSECTS INJURIOUS TO THE PLUM 



Plum leaf-miner (Nepticula sUngerlandeUa). 



American plum-borer {Eiii^ophera seniifuner- 

 ralis). 



Plum web-splnni-ng sawfly {Neiirofoma incon- 

 s pic It a). 



Plum plant-louse {MyBus mahaleh). 



Rusty brown plum aphid {Aphis scfan'cu). 



Mealy plum louse (Hyalopferus arundinis). 



European fruit-tree scale (As pi di of us ostrccc- 

 for mis). 



PEAR PESTS 



The pear-leaf blister-mite ^^ (EriopJiyes pyri) 

 Order — Acarina 



This is an European pest originally confined to 

 the pear but now an important pest on apple in New 

 York; it is a small, light-colored, four-legged ani- 

 mal about 1-125 of an inch in length; it hibernates 

 in the buds beneath the bud-scales ; in the spring the 

 mites become active and go to the unfolding leaves 

 into which they burrow and make small brown, 

 almost black, galls or blisters on them; the mites 

 live inside the galls in the tissues of the leaves and 

 lay their eggs there ; the young are produced in the 



?* Parrott— N. Y. State Expt. Stat., Bull. 306. 



