Insects Injurious to the Apple. 



125 



Under certain conditions a second brood may appear, but such 

 seems to be very unusual. 



The larv;e are creamy- white, grub-like creatures, with a dark 



FIG. 100.— SAW OF A FEMALE SAWFLY. 



(Greatly enlarged.) 



brown head and a double black chitinous plate on the upper surface 

 of the anal segment. When mature they reach h inch in length. ( )n 

 the first three segments are six jointed legs, on the fifth to the tenth 

 are pairs of sucker feet, and on the last segment another pair of sucker 

 feet. 



These krvre burrow into the fruitlets and eat out large cavities, 

 often attacking apples when they are no 

 larger than cob nuts. Each of these large 

 irregular chambers communicates with 

 the exterior by a small round hole which 

 is usually noticed on the side or near the 

 eye of the apple. Out of this opening 

 one frequently finds " frass " and much 

 moisture exuding. 



Attacked fruitlets can be seen on a 

 tree long belbre they fall. The larvie 

 may be found of all sizes in June and 

 early July. Possibly two broods over- 

 lap (3). The length of larval life 

 seems to vary, some mature in four 

 weeks, others take five weeks or more. 



If the fruitlet is destroyed before the larva is mature it moves 

 to another. When attack is early, and the fruitlets small, five 

 or more may be damaged by each larva. When mature, the larva? 



(/•■. Kilfiulen. 

 FIG. 101. — THE APl'LE .«A\VFLr. 

 (Natural size and enlai-yed.) 



