138 



Insect Pests. 



former. It is also common in Worcestershire, Herefordshire, Devon- 

 shire, and most parts where apples are grown. It occurs earlier than 



[/'. Edenden. 



FIG. lil. Aphis jitchii. NYMl'H, SHOWING 

 EXTRUDING YOUNG. 



(Greatly enlarged.) 



[/'. Edenden. 



FIG. 112.Aphi.<fttcliii (VIVIPAROUS 



FEMALE), SHOWING LARVAL ICHNEUMON 



WITHIN. 



either of the former, the young coming from the eggs in April, and 

 feeding upon the developing buds for some time. Later they attack 

 the blossom and were then noticed to do much harm. In 1907 the 

 eggs commenced to hatch on the 24th of March. Sanderson found in 

 America that the young became full grown in seven to nine days. 

 Those I kept under observation took twelve days before reaching 

 maturity. Migration takes place in the beginning of June and 

 continues to the end of the mouth. From this time until October, 



the apple is free from this pest. 

 From the 12th of September winged 

 forms were observed to come back 

 to the apple and egg-laying con- 

 tinued until the middle of November. 

 These oviparous females deposit a 

 few eggs, mainly in the axils of the 

 buds and on the spurs. Just as was 

 noticed by Walker, winged viviparous 

 and winged oviparous females occur 

 together on the same leaves in the 

 autumn. Attacked blossom becomes 

 browned and dies ; leaves are also attacked, but this species does 

 not seem to curl the leaves in the same way the other two species 



FIG. 113. OVUM OF Aphis tiMii 



BRANCH CREVICE. 



(Greatly enlarged.) 



