534 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



Life History The eggs occur on the twigs, as do those of 

 the last species, hatch about the same time, and the first 



two or three generations de- 

 velop on the apple in the 

 same manner. Like the last 

 species, the third generation is 

 mostly winged females which 

 migrate from the apple to some 

 unknown food-plant, on which 

 they pass the summer. The 

 winged females return to the 

 apple foliage in thef all and then 

 give birth to young, which de- 

 velop into the true males and 

 females, which may be found 



FIG. 463.-The rosy apple-aphis, wingless laying their eggs in company 

 viviparious female greatly enlarged. w j th the lagt and other spec i es> 



This species curls the leaves to a greater extent than does the 

 apple aphis, and is likewise accompanied by ants. Dr. Britton 

 states that "the rosy apple aphis . . . seems especially prone 

 to attack the fruit spurs and inner portions of the tree-top rather 



FIG. 464. Apples showing typical aphis injury. (Aphis sorbi.) 



than the terminal twigs and exterior part," and that it "affects 

 seriously the growth of the fruit/' preventing its growth and de- 

 velopment, and causing it to be gnarled and irregular in shape, 

 similar to the damage by the last species sometimes observed. 

 (See accompanying figure). 



