65 



the greater amount of effectiveness of arsenical spra3's used against 

 this insect is due to the leaf- feeding habits of the larva?. 



The question of the number of generations was again considered, 

 and all the data secured show that there are two generations at Boise, 

 Idaho, and the possibilit}' of ev^en a partial third generation is very 

 meager. Professor Aldrich states that he has distinguished a partial 

 third generation at Lewiston, Idaho, this past season. I wish to call 

 attention to a misquotation occurring in my 1901 report in regard to 

 Professor Gillette's views as to the possibilit}^ of a third generation, 

 as I find that the definite statement that a third generation could not 

 occur was not made ])y Professor Gillette. 



Mr. Marlatt in 1895 gave a relation between the numbcn- of genera- 

 tions of this insect and Dr. Morriani's life zones, in which he states 

 that there is one generation in the Transition, two in the Upper Aus- 

 tral, and three in the Lower Austral. In general, I find this to be 

 correct, but in view of new data relating to subzones and partial gen- 

 erations some exceptions must be recognized. 1 have an innnense 

 amount of data on all of these points that is not as yet fully worked 

 over. 



In conclusion, I would say that we can congratulate ourselves that 

 the codling moth can be controlled in the Pacific Northwest b}^ quite 

 inexpensive methods. 



At the conclusion of this paper Mr. Simpson showed lantern slides, 

 illustrating the life history and numerous methods of control of this 

 insect. 



Mr. Washburn next presented the following paper: 



A CRITICISM UPON CERTAIN CODLING MOTH OBSERVATIONS. 



By F. L. AVashburn, St. Anthunij Park, Minn. 



It is with a feeling of diffidence that I address you on a topic which 

 is worn so threadbare and has been so well threshed out as that of the 

 codling moth, and I feel that I am probably taking more of the time 

 of the association than is really my due. 



Although educated in the East and living in past years in Minnesota, 

 I have spent the last thirteen years on the Pacific coast, and hence 

 come among you as something of a tenderfoot, though a tenderfoot 

 from the West and not from the East. 



While at the California experiment station last spring I received 

 bulletin No. 69 from the Oregon station in which Mr. Cordley, who is 

 my successor there, criticises my work done upon the life history of 

 the codling moth in 1892. I later noted a criticism much to the same 

 effect from Mr. C. P. Gillette in the Entomological News for June of 



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