The Canon City record with which is consolidated the Canon City cannon., 1914-01-08
GREAT INTEREST WAS SHOWN in THE FRUIT GROWERS INSTITUTE


Fort Collins district Of northern Colo
rado." said Prof. Gillette. I'm 1905 it
rapidly decreased in numbers In the
section named apparently from the at
tacks Of several paracitic enemies and
q fungus disease. Since that time the
insect has not infested the district
in appreciable numbers.
Box Elder Leaf Roller.
Accompanying the outbreak Just
mentioned. the box elder leaf roller
appeared in about equal numbers and
completely defoliated many of the box
elder frees in the sections where it
was the most numerous. But this spe-
cies has not accompanied the out
break of the fruit tree leaf roller in
the Canon City section during the past
two or three years.
Life Habits Of Leaf Roller.
The female moth deposits her eggs
in compact oval clusters OF about
twenty-five TO more than one hundred
anywhere upon the bark Of the fruit
trees that serve as its food supply.
The eggs are distributed anywhere
from the bases of the trunks OF the
trees to the tips OF the wigs. or at
least to the limit of the previous years
growth
These clusters commonly vary
little from one-eiehth OF an inch IN
width to three or three and one-hait
, sixteenths OF an inch in their greater
diameter. and the clusters are more Or
less oval in outline.
~As soon as the egg mass has been
deposited the female moth smears the
eggs over with an impervious mate
zial which is thrown out from the
extremity of the abdomen and which
protect the eggs from the lnciemen-
eies of the weather and the attacks
cf pedaceous insects for nearly ten
months. or until the buds begin to
open the following year. SO there is
hut one brood OF the worms each sum
mer.
Eggs are Greeuish Yellow.
when freshly deposited the egg
patches are greenish yellow In color.
but soon become much darker on ex-
posure to the sunlight, until they imi-
tate very closely the color of the bark
upon which they rest. Before spring
many OF the patches become bleaehed
to light gray color. while others re-
main quite dark. The moths bred
from the light and dark patches do
not show any differences ip their
markings OF coioration-
| The eggs are stuck SO closely TO
the bark when they are deposited that
they often remain for several years.
The old egg patches are readily rec
ognized by the numerous small pune
lures from which the larvae or worms
escaped
The Larvae or Worms.
The larvae do not all hatch at
once. those In the warmer situations
hcing the first To emerge. and those
coming from n single egg patch usr-
ally vary several days in their date
OF emerEcnce.
| The date OF Matching Is by no
means constant. but is determined by
the eariine.s or iateness of the sea-
con. exactly as il the time for the
opening OF the buds. The earliest II
the larvae emerge with the first
bursting Of tho buds Of the apple
trees. and when the blossom buds OF
the apple begin TO show their pink
color the larvae Of the leaf roller
have mostly hatched- The active
Matching season Is usually distributed
ever about one week to ten days. the
time varying with the temperature
II the days and nights are cool the
period lasts longer than II Matching
takes place at time when tn edays
and pfxht~ sr, warm