15 
The total number of larve taken under the one burlap band upon 
the above tree growing in closely cut grass ground was 1,481. We 
did not take so large a proportion of the larvee from any tree growing 
upon well cultivated ground. 
WHEN THE LARVA COME DOWN, 
To determine what proportion of the larvee leave the fruit during 
the bright daylight and what proportion at night to go in search of a 
place to spin up, I bandaged a tree that I passed each morning and 
evening and removed the larve at about 7.30 a. m. and 6 p. m. from 
August 15 to 26. There were 414 larve taken, 353, or 85 per cent, of 
which came to the band during the night, and 61, or 15 per cent, 
during the day, between the hours mentioned. 
DURATION OF LARVAL PERIOD. 
Dr. Riley! gave this period as 25 to 30 days outside the cocoon, 
Washburn? as about 4 weeks, Card* as apparently 10 to 14 days, and 
Slingerland? estimated the time at 20 to 30 days. In our records the 
time has varied between 12 and 24 days, with an average of 19, at 
Fort Collins._ 
WHERE THE LARVA ENTERS THE APPLE. 
Unsprayed trees should be chosen to determine this point. There 
is also danger of error if the examination of the apple is superficial, 
as I have found that the larva often enters at the calyx, leaving no 
castings in sight, and then burrows out at the side some distance away, 
the latter burrow being kept open, but not the former. An examina- 
tion of 526 apples wormy by the first brood gave the following results: 
Two hundred and sixty-seven apples were wormy at the blossom only, 
18 at the stem only, 84 at the side only, and 157 had wormholes at the 
blossom and also at some other place. Adding this last number to the 
first, we have 424 out of 526 apples, or 80 per cent, with wormholes at 
the blossom end. The apples counted were of three varieties of crabs. 
DURATION OF COCOON STAGE OF FIRST SUMMER BROOD. 
The period elapsing from the time the larva leaves the apple or 
appears under a band to the time the moth emerges I have designated 
as the cocoon stage. The time elapsing before changing to the chrys- 
alis Riley® found to be 3days. During the present summer (1901) Mr. 
Taylor has carried through observations for me upon 76 larvee which 
transformed to moths, for the purpose of determining the average time 
Fourth Mo. Rep., p. 22. 
*Bul, 25, Or. Exp. Sta., p. 5. 
3 Bul. 51, Nebr. Exp. Sta., p. 22. 
4Bul. 142, Cornell Exp. Sta., p. 23, 
'Fourth Mo. Rep., p. 22. 
