36 



THE APPLK BOKER. 



CHAPTER XI. 



INSECTS INJURIOUS TO THE APPLE. 



mmmmm 



THE ROUND-HEADED BORER — FLAT-HEADED BORER — WOOLLY 



LOUSE OYSTER-SHELL BARK LOUSE — TENT CATERPILLAR — 



CANKER WORM — APHIS — CODLIN MOTH — MAGGOT — CURCULIO. 



The Round-headed Apple-borer (Saperda hivittata) (Harris). 

 — This is oue of the most injurious insects to the Apple tree. 

 The perfect insect, Fig. 31, a, is a beetle about three-fourths of 

 an inch long, Avith three light-brown and two creamy-white stripes 



, upon its wing covers. It flies in the night, 



laying its eggs upon the trunk in crevices 

 of the bark, near the ground, in June and 

 i'3 July. The eggs hatch, and the young 

 larvse penetrate the bark, feeding upon the 

 sapwood for nearly two years ; often eating 

 a space from one to two inches in diameter, 

 Hy. :ii,((. jj^jj^ jj^ young trees sometimes nearly gird- 



ling them. Its chips are packed beliin 1 it, except a few during 

 its early stages of working, when, by careful examination of the 



tree, its presence may be discovered. After ^ 



the second year it generally ])enetrates the 



heart-wood, sometimes going through youn' 



trees; or, in larger ones, making a turn and i 



coming near the bark, where it undergoes I 



its changes (Fig. 31, b, shows the chrysalis) 



and comes out the perfect beetle (Fig. 31, 



c,) the third year, leaving a clean hole about j-jg. 31^ 4. 



three-sixteenths of an inch in diameter. 



It may be discovered in the tree by the fine 

 chips it exudes while very young, and by the 

 l)ark over the injured part turning dark- 

 lown, and sometimes cracking. 

 Remedy. — The only sure remedy is to ex- 

 amine the trees carefully once or twice each 

 season, and dig out the borer with a strong, 

 Fif?. ii.c. pointed knife. 



The Flat-headed Apple-borer (Chrysobothris femorata). — 

 This beetle is much smaller than the last, and moves in the day 



