63 



Dr. Ustick, of Boise, used lime arsenite and banding. I estimated 

 his loss to be about 10 per cent. I visited these last three orchards 

 September 24, and searching- diligently under the bands for larvae, 

 found but 3 under 30 or 40 bands. Mr. C. Hinze, of Payette, 

 used Paris green with either kerosene or coal tar. He writes me that 

 his total loss from all causes amounted to only 0.05 per cent. 



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

 found only 8 larvee under bands at 18 trees, while in a neglected 

 orchard on the same date (September 21) I found 94 larvae on 10 trees. 



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

 times. 



The pupae may be killed with the larvae under the bands by crush- 

 ing. They are so well protected that this is the only practicable 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 can not 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 that 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. 



INSECTS AND THE WEATHER DURING THE SEASON OF 1900. 



By F. H. Chittenden. 



Investigations begun during the season of 1899 upon the effects of 

 atmospheric and other conditions, in causing an increase or decrease 

 of injurious insects during that year, were continued during the sea- 

 son of 1900 with some interesting results. 



The studies of this subject that have been made have not been as 

 complete as could be desired, but as a result of observations conducted 



