MONTANA EXPERIMENT STATION. 



177 



and of a greenish color lives within the rolled or crumpled leaves 

 feeding from the inside. When abundant, the larvae not only eat 

 parts of the folia*e but cause the remainder to turn brown. The 

 larvae are very active and when taken into one's hand quickly wrig- 

 gle out and drop to the ground. 



There are two broods, one appearing in June and the other in 

 August. 



The larvae feed on the foliage of strawberry, raspberry, blackber- 

 ry and various other plants. 



Fig. 24. The Strawberry Leaf-roller: a, larva, natural size; b, anterior end 

 of larva, seen from abovei, enlarged; c, moth, enlarged; d, posterior end of 

 larva, seen from above, enlarged. (First Rept. Insects of Mo., Riley, 1869.) 



THE CHERRY FRUIT-FLY. i. 



The plum curculio is responsible for most "wormy" cherries but 

 "cherry fruit-fly" may appear in the market fruits and if in the 

 market is liable to escape to growing cherries. The cherry fruit 

 fly as its name indicates is a fly and it is the larva or maggot that 

 causes the damage. The work of the grub of the plum curculio is 

 usually apparent from the exterior of the cherry, but in the case 

 of this maggot the cherries may from the outside appear to be per- 

 fectlv sound. 



The cherry maggots are very light yellow in color and of the 

 shape and size shown in the small black circle, above, in the accom- 

 panying figure. 



The body of the fly is black and the head and legs are of a light 

 yellow color. . The wings are crossed by four blackish bands and 

 have a blackish spot at the tip. 



This insect is not very well known as a pest of cherries. It has 

 been reported only from the eastern states. It is, however, one of 



I. 



Rhagoletis ciiigulata Loew. 



