580 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



The Peach Twig-borer * 



On the Pacific Coast the Peach Twig-borer, often known there 

 as the peach worm, is one of the most serious pests of the peach. 

 In the Eastern States it has been injurious in Delaware, Virginia 

 and Maryland, but only occasionally. Probably the insect occurs 

 throughout the country wherever the peach is grown, as it is 

 an old European insect which was first noticed in the United 

 States in 1860. On the Pacific Coast the over- wintering larvae 

 bore into the tender shoots in early spring and during the summer 



bore into the fruit, particularly 

 the later varieties. Prune, 

 nectarine, apricot, almond, 

 and pear are also injured. 



The adult moth is a dark- 

 gray color, with fore-wings ex- 

 panding about one-half inch 

 and marked with darker spots. 



The full grown larva is about 

 one-half inch long, of a dull 

 reddish-brown color with dark 

 brown or blackish head. 



Life History. "The insect 

 passes the winter as a very 

 small larva in silken-lined cells 

 FIG. 511. The peach twig-borer or burrows in the spongy 

 (Anarsia lineatella) : adult moth with fi ssne o f fV, P hark at tVip 

 wings spread and folded -much T Dark at tne 



enlarged. (After Marlatt, U. S. crotches of the limbs. Their 

 Dept. Agr.) presence is indicated by small 



mounds of comminuted bark, as shown in Fig. 512, at a and b. 

 Early in the spring, as the foliage is putting out, the larvae begin 

 to leave their burrows and attack the tender shoots, boring into 

 and down the pith, the galleries ranging from about one-third inch 

 to 1J inches in length. The shoot thus injured soon wilts and 

 dies, as shown in Fig. 513, at a. Many shoots may be attacked by 

 a single larva, which is thus capable of doing considerable harm. 

 There are two or three generations of larvae during the summer in 



* Anarsia lineatella Zell. Family Gelechiidce. See W. T. Clarke, Bulletin 

 144, Cal. Agr. Exp. Sta.; C. L. Marlatt, Bulletin 10, n. s., Div. Ent., U. S. 

 Dept. Agr.; A. L. Quaintance, Yearbook U. S. Dept. Agr., 1905, p. 344. 



