THE MONTHLY BULIjETIN. 77 



Life History. — The lice hatch as soon as the buds open in the spring 

 from over-wintering eggs deposited on the branches of the cherry 

 trees and previous fall. Throughout the entire summer only females 

 appear which have the power to reproduce their like — these being the 

 destructive forms. In the fall, however, they give birth to true males 

 and females, which mate, the females depositing the over-wintering 

 eggs. The lice breed very rapidly and occasionally cause considerable 

 trouble. 



Distribution. — Throughout the central and southern parts of the 

 State. 



Food Plants. — The attacks of this pest are practically confined to 

 the cherry, so it may readily be distinguished from all other black lice. 



Control. — On old trees spraying with the emulsions, soap sprays 

 and tobacco decoctions will control the pest. Young shoots which may 

 liecome seriously infested near the tips, especially on nursery stock 

 or small trees, can be dipped into a solution of these sprays. 



Natural Enemies. — Natural enemies practically control the cherry 

 louse. Many species of syrphid and green lacewing tlies feed upon 

 this species, while ladybird beetles share a large part in the work. 

 In the east Praon cerasaphis Fitch is parasitic upon the lice and 

 destroys great numbers. 



THE GREEN PEACH APHID. 



Myzus persicas Sulzer. 

 (Fig. 61.) 



General Appearance. — The color of this species varies from yellow- 

 ish to rich green. The winged forms have dark olive-green head, 

 thorax, and markings on the abdomen, as shown in Fig. 61. The 

 apterous forms have no markings at all. This species is medium in 

 size, varying from 1.5 to 1.9 mm. in length. 



Life History. — The spring forms hatch from eggs deposited the 

 former fall, and bring forth young just M^hen the new foliage begins 

 to appear. All twigs, and especially the tender growths are quickly 

 attacked. Breeding continues throughout the entire spring and sum- 

 mer. In the fall males and females appear, and, copulating, give rise 

 to the wintering eggs and the next year's broods. 



