Spraying Apple Trees. 25
md In June, from the 25th to the 30th, numerous larvae have been
OTN collected, a large proportion nearly ready to pupate, but with them
some very young. A lot of forty-nine preserved at this time gives
MW- the following percentages:
iter - About grown, 42.85; two—thirds grown, 12.22; one-half grown,
42.85, one—fourth grown, 2.04.
me Larvae come from the trees in large numbers in early July for
mt A pupation. Some have pupated by July 3, and in 1903, on July
23,\from bands about apple trees, twenty—seven pupae were taken,
thirty-eight larvae, and six empty pupa cases, showing that some
z3_ Q moths had emerged. On August 8, 1903, from the same bands,
’ twenty-three larvae were taken and five pupae, while on August
ber 20, ninety-nine larvae were collected from the bands, with one pupa
and ten empty pupa cases. September 17, fifty-seven larvae were
the taken and one pupa ease. About August 20, therefore, may be re-
garded as the time when the pupal period of the summer brood
ms ceases. The large number of larvae obtained on this date pertain
ESG ' to the winter brood, and later were observed preparing the silken
  cases _iu which they hibernate. ,
pg When thc larvae descend from the trees in mid-summer, they
ths remain without pupating for some time, from six to twelve days in
our experience, and remain in the pupa stage from four to four-
the teen `days, with an average of about seven and a half days. Some
md records made by Mr. E. P. Taylor in 1903, while assistant in the
wv Division, will illustrate the point. The larvae were collected from
  under bands placed about apple trees for the purpose of attract-
mn I ing them :
`CW 1. From band, June 25; pupated, July 7 g adult, J uly 11.
UW 2. From bandj June   pupated, July 7; adult, July 12. _
H] 3. From band, June 26; pupated, July 7; adult, July 13.
bib 1. From band. June 27; pupated, July 7; adult, July 13.
m I 5. From band, July 1; pupated, July 7; adult, July 16.
wt ° 6. From band, July 7; pupated. July 7; adult. July 27.
re- »
lt is just possible that at times three broods develop. ;\t Lex-
iH_ ington. October 28. 1389. l found a half-grown larva in an apple
28_ taken from a tree.