THIRD ANNUAL REPORT OF STATE ENTOMOLOGIST. 201 



orchard but did not find a single case of injury to the rose fruit by 

 this species. Yet, when forced by the absence of suitable food it 

 may still be possible that it would attack the rose. To the writer 

 it appears as very improbable that in Montana even a single gener- 

 ation could come to maturity in this way. The seeds of the rose 

 hip later in the season become very hard and unfit as food for an 

 insect with jaws no stronger than those of the codling moth larvae 

 and if the first generation had matured, the second would in all pro- 

 bability perish. This question has engaged the interest of those 

 occupied in fruit growing in Montana because of its connection with 

 the problem of the control of the spread of the species in our fruit 

 growing regions. 



The debated question of the nut feeding habit of the. moths 

 m other localities is of little practical interest in Montana. 



In this connection we would mention the very interesting ex- 

 periments on the leaf feeding propensity of the larvae conducted by 

 Prof. Cordley and recorded in Mr. Simpson's extended account of 

 the codling moths (Bulletin 41, Division of Entomology, U. S. Dept. 

 of Agr., 1903). Prof. Card in 1897 recorded that young larvae, par- 

 ticularly when confined nibble the leaves of the apple and in his 

 bulletin Mr. Simpson records having seen leaves eaten in cases 

 where he thought the work to be of the codling moth. Prof. Cordley 

 made actual observations which can best be described in his own 

 words. 



"It was found on June 4 that these eggs had hatched and nearly 

 all of the larvae were dead. Two of them, however, had fed upon 

 the leaves, were yet alive and had made some growth, notwith- 

 standing the fact that the leaves had been taken from the tree 

 nearly a month before and were therefore presumably not in the 

 .most palatable condition. Both larvae- were feeding upon the lower 

 parenchyma of the leaf, and one had completely covered itself with 

 a web holding pellets of frass. A recently hatched larva, mounted 

 in balsam, measured 1.35 mm. in length; the larger of these 

 two larvae at this time measured 1.80 mm. in length and was pro- 

 portionately stouter. Both were transferred to fresh leaves, upon 

 which they fed until June 8. when one of them disappeared. The 

 other continued to feed until June ^, when it too disappeared. 

 However, I noticed a slight discoloration of the lidrib of the leaf, 



