INJURIOUS INSECTS. 19 



Remedies. — Arsenites applied when the buds begin to 

 open, and again ten days later. Burn infested leaves in 

 June. 

 Canker- Worm {Paleacrita vernata, Peck). — Larva; "a 

 measuring worm," an inch long, dark and variously striped, 

 feeding upon the leaves. 



Preventive. — Bands smeared with tar or printer's ink, or 

 similar devices, placed about the trunk of the tree to pre- 

 vent the wingless females from climbing. Tedious. 



Remedies. — Arsenites, thoroughly applied in spray, are 

 very effective. Jar the worms into straw, and burn the 

 straw. 

 CoDtiN-MoTH (Carpocapsa pomonella, Linn.). — Larva (off- 

 spring of a small grayish moth), three-fourths inch long, 

 pinkish, feeding in fruit ; generally two broods. 



Remedies. — Arsenites applied just after the blossoms 

 fall and again ten days or two weeks later. A third appli- 

 cation is rarely necessary. The arsenites may be applied 

 with Bordeaux mixture when spraying for the apple-scab. 

 (See Chap. IV.) Swine in the orchard. Cloth band about 

 the trunk of the tree, which is examined at intervals of 

 seven to nine days for larvae and chrysalids. 

 Fall Web- Worm (Hyphantria cunea, Drury). — Hairy 

 larva, about an inch long, varying from gray to pale yellow 

 or bluish black, feeding upon the leaves of many trees, in 

 tents or webs. 



Remedies. — Destroy by burning the webs, or removing 

 them and crushing the larvse. Spray with arsenites. 

 Flat-headed Borer (Chrysobothris femorata, Fabr.). — 

 Larva about an inch long, flesh-colored, the second segment 

 ("head") greatly enlarged; boring under the bark and 

 sometimes into the wood. They are readily located in late 

 summer or fall by the dead and sunken patches of bark. 



Preventive. — Soap and carbolic acid washes applied early 

 in June and July. Keep trees vigorous. 



Remedies. — Dig out the borers in early summer and fall. 

 Encourage woodpeckers. 



