62 



CIRCULAR 2 70, U. S. DEPARTMENT OF AGRICULTURE 



the fungicides used at that time for the control of brown rot. A third 

 application, when the husks have fallen, may be necessary if the 

 infestation is severe. 



Caterpillars 



The caterpillars of various moths often become injurious to prune 

 trees in western Oregon and Washington. These caterpillars are 

 most likely to be the tent caterpillars, fall web worms, or caterpillars 

 of tussock moths. A discussion of these insects will be found on 

 pages 39 to 41. 



Peach Twig Borer 



Prune trees are attacked by the peach twig borer in much the same 

 manner as are peach trees. The brown worms bore into the tender 

 new growth, causing the leaves to wilt, and later they feed in the fruit. 

 The life history and control of this pest are given on page 64. 



PEACH INSECTS 



Green Peach Aphid 



A serious reduction of the peach crop is sometimes caused by large 



numbers of green peach 

 aphids (Myzus persicae 

 (Sulzer)) > (fig. 70) in 

 the opening blossoms. 

 These sucking insects, 

 by removing the 

 juices from the newly 

 formed fruit, may 

 cause it to drop. 

 They also curl the 

 leaves badly and pre- 

 vent them from 

 developing normally. 

 It is important, there- 

 fore, that control 

 measures be taken 

 early, as little or no 

 injury occurs later on. 

 Figure 70.— Green peach aphids on pear foliage. The green peach aphid 



came from Europe and 

 is common in all of the peach-growing districts of the West. 



LIFE HISTORY 



The glossy black wintering eggs may be found on the twigs, in the 

 axils of the buds, and in the crevices of the bark. They hatch early 

 in the spring, and the pinkish young commence feeding at once on 

 the opening buds, pushing their way into the unfolding blossoms and 

 between the developing leaves. The second and third generations 

 are green, and the latter acquire wings and migrate to summer food 

 plants, which include many of the common vegetables and ornamental 

 plants, such as cabbage, cucumber, lettuce, potato, tomato, turnip, 



