11 



DURATION OF SPRING BROOD OF MOTHS. 



Of the 12 males kept in breeding cages 2 died on the second day, 3 

 upon the third, 1 on the fourth, 2 on the fifth, 3 on the sixth, and 1 

 on the seventh; an average of a trifle over 4 days. Of 7 females 1 died 

 on the sixth day, 3 on the seventh, 2 on the ninth, and 1 on the thir- 

 teenth ; an average of a little over 8 days. Fully half of the females 

 in breeding cages did not lay eggs at all. 



SPRING BROOD OF EGGS. 



The starting point of the first brood can better be taken at Qgg lay- 

 ing than from the appearance of the moths. The moths that appear 

 very early are compelled to wait for oviposition until apples are ready 

 to receive their eggs. The earliest that eggs have been observed at 

 Fort Collins was June 9, 1900. This year they were not found until 

 June 19. They became increasingly abundant until the\^ reached 

 their maximum about July 3, and by July 21 it was almost impossible 

 to find an unhatched egg. By July 27 a noticeable increase had started 

 again, marking the beginning of the second brood. 



Professor Cockerell records eggs as earh^ as May 1 at Mesilla Park, 

 N. Mex. At Grand Junction, Colo., I found them in small numbers 

 May 25, 1900, and estimated that they might have occurred as early as 

 the 18th of the month. Slingerland records them on May 26 at Ithaca, 

 N. Y., and Card gives June 3 as the earliest date known to him for 

 the appearance of the eggs in Nebraska. One is not liable to discover 

 tlie first eggs laid by the codling moth, so it is likely that any of the 

 above dates may be too late for the earliest eggs, and the dates in 

 a given locality will vary in different seasons with the date of the 

 blooming of the apple trees. This is so imi)ortant a date to have from 

 which to work in studying the life history of the codling moth that I 

 offer the following table, giving the dates at which apple trees bloom 

 in different portions of the country. It is chiefly compiled from 

 answers to letters which I have sent out. 



Table II. — Dates at ivhich apple trees bloom in different localities. 



Locality. 



Reno,Nev 



Cor vallis, Greg - 



Urbana, 111 



Grand Junction, Colo . 

 Southern New Jersey 



Columbia, Mo 



Blacksburg, Va 



Lafayette, Ind 



Lincoln, Nobr -.. 



Rockyf ord, Colo 



College Park,Md. 



Bozeman, Mont 



Morgantown, W. Va . _ . 



Cornell,N.Y . 



Geneva. N.Y 



Fort Collins, Colo 



Wooster, Ohio 



Canon City, Colo.' 



Lansing, Mich 



Ottawa, Canada -. . 



Moscow, Idaho . 



Burlington, Vt 



Madison, Wis . . . 



OroncMe 



Date of bloom. 



Mar.20-Apr.10- 



Mar. 25- Apr. 5 



Apr. 10 



Apr. 15-27... -. 



Apr.20 



Apr.20-May 5 



Apr.20-30. 



Apr.20.... 



Apr.27-May 2 ...^ ..- 



Apr.28 



Apr. 30 .- 



May 1-5 



May 1-10 



May 1-10 - - 



May 4-17 



May5-15 



May8-10 



May 10.. 



May 10-12 



May 10-15- 



May 10-15 



May 15 



May 15 



May 20 



^ Evidently a late season 



Informant. 



R. Lewers. 

 A. B. Cordley. 

 J. C. Blair. 

 C. P. Gillette. 

 J.B.Smith. 

 J. M. Stedman. 

 J.L.Phillips. 

 J. Troop. 



Lawrence Bruner. 

 H.H. Griffin. 

 W.G.Johnson. 

 R.A. Cooley. 

 A. D. Hopkins. 

 M. V. Slingerland. 

 V.H.Lowe. 

 C.P.Gillette. 



F. M. Webster. 

 R.J. Peare. 



L. R. Taft. 

 J.Fletcher. 

 J. M. Aldrich; 



G. H. Perkins. 

 E.S.Goff. 



W. M. Munson. 



