PART I. 
INSECTS INJURIOUS TO THE APPLE. 
ATTACKING THE FRUIT. 
CODLING MOTH. 
Flesh-colored larvae eating into the fruit and causing wormy 
apples. The first brood of larvae (worms) begin eating into the 
fruit when early apples are about an inch in diameter. This brood 
is not very numerous, but it develops into a second brood about 
seven weeks later which is very much more numerous. The moth 
and its eggs are shown at Plate I., Figs. 3 and 4. 
Remedies .—The arsenical poisons are, by far, the best remedies we have 
for this insect. See remedies 4, 3, 6, 8, 7, 5. 
The combination of Bordeaux mixture (8) with the arsenites is very popu¬ 
lar farther east where fungus diseases are prevalent. The writer believes there 
is no occasion as yet to use Bordeaux mixture upon apple trees in Colorado 
except for the purpose of causing the poison to adhere better to the foliage. 
Make the first application as soon as the blossoms have faded and nearly 
all fallen. Continue the application till every calyx (blossom) is filled with the 
liquid. Repeat the application in one week. If heavy storms follow to wash out 
the poison, make a third application as soon as the storm is over. Upon the 
thoroughness of the first and second applications the success will chiefly depend. 
Just what degree of success may be expected from later applications has not 
been thoroughly determined. *Professor Cordlev, of Oregon, seems to have proven 
that late spraying is very important in that State. 
Bandages (36) are also of considerable service if carefully attended to. 
Lights to trap the moths are valueless. Screen cellar windows and doors where 
fruit is kept. 
Plate II., Fig. 1, shows blossoms from which the petals have 
fallen and also small apples with their blossoms (calyces) tightly 
closed, so that little or no spray could be forced into them, all upon 
a single spur of a Duchess tree at one time. The blossoms at (a) 
are in just the right condition to receive and hold the poison. The 
two apples should have received the spray a full week earlier. 
ATTACKING THE FOLIAGE. 
LEAF-ROLLERS. 
The fruit-tree leaf-roller (Cacoecia argyrospila) is a green larva 
with a black head and measuring about three-fourths of an inch in 
length when fully grown. The larvae begin to hatch with the open¬ 
ing of the buds of the apple trees in the spring. They attack at 
*Bull. 69, Or. Exp. Station. 
