522 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



part with long wood fibres. The full-grown larva is a light 

 yellowish, cylindrical grub, about three-quarters inch long. The 

 head is small, legs are lacking, and the body tapers gradually 

 from the thorax backward, the segments being quite constricted. 

 The third spring the larvae transform to pupae and about three 

 weeks later the adult beetles emerge through large round holes. 

 This habit is varied, according to Brooks, in some localities 

 the majority of the beetles emerge in two years from the time 



FIG. 451. Young apple tree protected from borers by a wire screen pro- 

 tector. Photo by W. E. Rumsey. 



of hatching in place of in three, as is generally the case in the 

 northern range of the insect. 



Control. The females may be prevented from laying their 

 eggs by wrapping the trunks with wire netting, building paper, 

 or wood veneer. If non-rusting wire netting is used it may be 

 left on and will also protect the trees from mice and rabbits. 

 The paper or wood wrappings should be applied about May 1st, 

 and removed in late summer. They should be tied to the tree 

 tightly just below the crotch and should extend an inch or two 

 into the soil below. The wire netting should be held out from the 



