IQ4 ENTOMOLOGICAL NEWS. [June, '02 



more than two broods of the codling moth in many parts of United States, 

 I must say that I am unable to find any records published that tend 

 strongly to prove such an opinion, to say nothing about an indication of 

 even a partial fourth brood. 



In Bulletin 25 of the Oregon Experiment Station, 1893, p. 5, Mr. Wash- 

 burn gives a table and records which he considers to be "convincing 

 proofs that the moth is at least four-brooded in Oregon." 



In Mr. Washburn's table he places the beginning of egg-hatching for 

 the first brood of moths June 2ist, of the second brood Aug. 29th, and 

 of the third Nov. 6th. The fourth he does not give, but figured like the 

 others, it would come Jan. isth, and the larvae would not mature before 

 the first week in Feb. As these dates were to mark the beginnings of 

 the brood the last of each brood would come much later. This, of course, 

 is quite absurd, but I think Mr. Washburn counted the fall bood in the 

 fall and again in the spring and so increased the number of generations 

 that appear during a year by one. This being true, it would cut his num- 

 ber to three broods as he estimated them. But with three broods the 

 hatching of the first eggs for the third brood would come on Nov. 6th. 

 Egg-laying would probably continue for fully six weeks which would carry 

 it to December i8th. To this we should have to add fully three weeks for 

 the development of the larvae, which would take us to Jan. 8th, which 

 surely is very much too late. If so, this would reduce the number of 

 broods to two, unless there existed a partial brood, which I think it is best 

 to doubt for almost any insect with an abundant food-supply until its 

 presence is thoroughly proven. 



Mr. A. B. Cordley, of the Oregon Experiment Station, has recently 

 written me that during four years' work with the codling moth in that 

 State he has never been able to rear a moth later than Sept. isth. This 

 corresponds almost exactly with our records for northern Colorado, and 

 it means that the larvae of the codling moth began to hibernate in Oregon 

 as early as the first week in August, and almost certainly cuts the number 

 of broods to two, as they occur in Colorado. 



In Bulletin 21 of the Idaho Experiment Station, 1900, p. lor, Mr. Aid- 

 rich announces three broods and a partial fourth for that State in the 

 vicinity of Boise, but gives no data to support such a conclusion. If 

 records proving this number of broods are in existence, they should be 

 published in full for the benefit of entomological workers and fruit 

 growers. 



Another published record given to prove three broods in Idaho 

 appears in Bulletin 30, New Series, U. S. Dep. of Agr., Division of Ento- 

 mology, p. 56. The record is by Mr. C. B. Simpson, agent of the divis- 

 ion. An orchard of 140 trees was banded and the bands removed at 

 intervals of a few days and the larvae taken. A complete record of the 

 captures was taken and is given to show the rise and fall in numbers cor- 

 responding to the rise and fall of the different broods. If we take the 

 number given for each date in Mr. Simpson's record and divide it by the 



