il 
DURATION OF SPRING BROOD OF MOTHS. 
Of the 12 males kept in breeding cages 2 died on the second day, 5 
upon the third, 1 on the fourth, 2 on the fifth, 3 on the sixth, and 1 
on the seventh; an average of a trifleover 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 egg 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 they 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 early as May 4 at Mesilla Park, 
N. Mex. At Grand Junetion, 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 
the 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 important 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. 
TasBLeE Il.—Dates at which Pigs trees bloom +n different localities. 
Locality. Date of bloom. Informant. 
Reno, Neve SER eee Mar Z0-Aprsl0mcsasco- Seaeceaeaes echoes chee mess R. Lewers. 
Cor vallis, Ore rarer eee sn aT Op ADI Oso 2e2 onan cs Seeeee eee ele .| A. B. Cordley. 
Mirigraniilen ess ISON Ses Ae eS aE TE ee ee Bee Oablair: 
peau e MOM, COL. sel ADRalo-eis seer c= ete on ee eee oe oe CP. Gillette: 
SOMLUerMeNCwWrdleLsey 25 || ADIe0 ess ns 5 oa een ene oe 2 oeeas sh oeee ee =| di omMith: 
Molim bia Mor 2127522... = ADT ACOSTA Veo ese aoe ea oe eee een es J.M.Stedman. 
Blacksburg, Va---.--.------ UATE eM) ee eet, Be Is a Ro eg ee J.L. Phillips. 
Lafayette, Ind_._..--.--.--. Y NYO) ays ee oP EE ee on J.Troop. 
MincolnyNOprie. 22: 5552.5. ApPri2ioMaAy 2 -- ne sssn eee oe ae =| uawrence Bruner: 
Rockytord, Colo.._2-------- FACIE OR pene ce ete cea tae Seton ee ese H. H. Griffin. 
Cone Core aT Ke Vi Gemeente ATT aoc cme nok ee Coe CE sn ce |W. G. Johnson: 
IS oyaeiaws Te IN Woy hs yeaa te I aad als ee ae eee a ee ee R. A. Cooley. 
Morgantown, W. Va----_---. aya 1 eee ei nn eee ee ALD Hopkins: 
Cornell) NAVs 2-2-2. Wiepy lO Rae etre Sere meer eS Sek een ee M. V.Slingerland. 
GrenevaoNaWwie os coese- = bes IVER VA Nee eee ee ee or eee Te Vebeowe: 
Fort Collins, Colo_—....---- IV Siva y= peepee eer nok oe en ae sek oe yo poe C.P. Gillette. 
NMaOster OniO= e925 G-_ Wee MD We ee See SD ae ee ee F. M. Webster. 
(Orpinvorn (Citing (G7a) Ros SS EN a) 0 AO ee De nee R. J. Peare. 
Mansing. Michi 5-8 ==. 25 Marval (alae ge sec Se ee ee ede nef dae Reacts 
QR Sig (OPA GY = SMES SEES Wik) (00 bi Se ee ee ee ae eee eee J. Fletcher. 
MOSCOW, Lan. sse2-- = oc8 Waal Dee sere eee io nee ee he CS Aldrich: 
Burlington, Witp oo: << 25, IT cave be Sate Bee Se ea a a Se, on G.H. Perkins. 
Madison? Wis -2- 2224-220: AV Syl pees eee ee <5 MS SES EE OS E.S. Goff. 
Orono, Mo co cece: eae May 20 pase =e Nes ae ae ORR oe = oS W. M. Munson. 
1 Evidently a inte season. 
