58 INSECTS OF KCONO^^IIC niPORTANCE 



Control — Pick and destroy all misshapen in- 

 fested fruits before May 15th; use kainit, one-half 

 ton per acre. 



The pear thrips ^^ {Euthrips pyri) 

 Order — Thysanoptera 



The thrips was first discovered in California, 

 where it has caused much injury; it was first discov- 

 ered in New York in the Hudson River Valley in 

 191 1, although probably had been present there for 

 some years before ; the thrips pass the fall and win- 

 ter in the soil and the adults appear in the spring; 

 they injure the opening buds and lay their eggs in 

 the tissues of the fruit stems and leaves; the 

 nymphs feed mainly on the young leaves; after 

 feeding about two weeks they go into the ground 

 but do not change to pupae until about October. 



Control — Spray swelling, partly open and fully 

 opened buds with nicotine sulphate, ^ pint to 100 

 gallons water and 5 pounds soap; spray on succes- 

 sive days or every few days until probably 2 or 3 

 applications have been made. 



The sinuate pear borer *^ (Agriliis sinuafits) 

 Order — Coleoptera 



First discovered in New Jersey in 1S94; now se- 

 riously injurious in lower Hudson Valley; the fe- 

 male deposits her eggs in crevices of the bark or 

 under the bark scales ; these hatch in early July and 

 the slender whitish grubs make winding burrows in 

 the sapwood; the larva rests during the winter but 

 the next year it makes larger and more winding 

 burrows which frequently cut off the supply of sap 

 and kill the tree ; the larva passes another winter in 

 the tree changing to a pupa in the following spring; 



40 Parrott— N. Y. State Expt. Stat., Bull. 343. 



41 Smith— 15th Ann. Kept. N. J. Agr, Expt. Station. 



