APHIDS INJURIOUS TO ORCHARD FRUITS. 



is particularly true of the fall migrants, which appear upon the trees 

 in the fall. These produce the orange-yellow, wingless, egg-laying 



females. The males are 



winged and similar to the 

 fall migrants. The summer 

 forms occurring upon plan- 

 tain are y.ellowish green, 

 with brown patches at the 

 base of the honey tubes. 



SEASONAL HISTORY. 



The eggs of this species 

 are deposited on the apple in 

 the fall. They are light yel- 

 low when laid and change 

 from green to polished black. 

 They are placed upon the 

 twigs, in the axils of the 

 buds, or in crevices in the 

 bark, but sometimes they 

 are laid upon the larger 

 branches. They begin hatch- 

 ing at about the time the 

 buds are breaking in the 



Fig. 4. — The rosy aphis : Twisted apple twig rc- 

 Spring. suiting from injury by this species. (Original.) 



The young stem-mother immediately begins feeding upon the 

 bursting buds, and as the young leaves develop they curl about her. 



Fig. 5. — The rosy aphis : Condition of the foliage in spring when leaves curled by 

 this insect are first in evidence. (Original.) 



(Fig 5.) Usually in 15 days the stem-mother is mature, whereupon 

 she begins producing young (fig. 2, d) at an average of 6 a day. 

 The stem-mother lives from a month to six wrecks. 

 78569°— Bull. 804—17 2 



