THE CODLIN MOTH IN IDAHO IN 1900. 



821 



For contrast it might be mentioned that in Mr. Tiner's orchard I found 

 only eight larvae under bands at eighteen trees, while in a neglected orchard 

 on the same date (September 21) I found ninety-four larvae on ten trees. 



In all these cases cited the orchards were sprayed from four to six 

 times. 



The pupae may be killed with the larv* under the bands by crushing. 

 They are so well protected that this is the only practical way to reach 

 them. 



I have previously stated how the adults in a storehouse may be killed. 

 A few fruit-growers have told me that they caught numerous adult codling 

 moths by trap lanterns. All accurate work upon this point has shown 

 that the moth is not attracted to light, the noctuids and sphingids caught 

 being mistaken for codling moths. 



One grower says he catches many of the moths in buckets in which 

 there is some cider or vinegar. This fruit-grower is a man well informed 

 upon the subject, and I tried to experiment with his remedy, but was 

 stopped by cold weather and sickness. 



Summary and Conclusions. 



1. The codling moth is more injurious in Idaho than in the East on account of the 

 number and the overlapping of broods. 



2. There are three broods and probably a part of a fourth, which overlap. 



3. The moth cannot be controlled by natural means. 



4. It has been allowed to get a firm foothold in the State. 



5. By several sprayings with arsenites and by banding the injury may be reduced 

 to from 5 to 20 per cent., depending upon locality. 



6. I firmly believe that, if the recommendations given here be followed by all fruit- 

 growers in a locality for one or two years, the moth would cease to be a serious 

 pest in that locality. 



I recommend that this work be carried on in Idaho and possibly Oregon and 

 Washington another year, as I believe this last summer's work has simply outlined the 

 problem and discovered the points to be worked upon. 



