6 
THE COLORADO EXPERIMENT STATION 
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 developes into a second brood that 
comes on late in the summer 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 3, 4, 5, 6, 7, 8. 
The combination of Bordeaux mixture (8) with the arsenites is very 
popular farther east where fungus diseases are prevalent. 
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. Or, if you 
were very thorough in the first treatment and if no blossoms have 
opened since, it will probably be better to follow the plan of Mr. Art. 
Roberts, of Paonia, and make the second application thirty days after 
the first, and then make a third application after another thirty days. 
Whether or not a large number of applications are needed will depend 
upon the number of wormy apples that appear during July and August. 
If heavy showers follow a treatment, it is usually well to repeat the 
application. This is not so necessary if arsenate of lead is used. 
Upon the thoroughness of the first and second applications the suc¬ 
cess will chiefly depend. Just what degree of benefit may be expected 
from later applications has not been thoroughly determined. *Professor 
Cordley, of Oregon, seems to have proven that late spraying is very im¬ 
portant in that state. 
Bandages (36) are also of considerable service if carefully attended 
to, and if the worms are very numerous. Lights to trap the moths are 
valueless. Screen cellar windows and doors where fruit is kept. 
Plate 2, 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. In 
such a case two early sprays are needed. 
HOWARD’S SCALE (Aspidiotus Howardi ). 
This scale is occasionally found upon apples in Colorado. It closely 
resembles the San Jose scale but seldom causes the red blotch where it 
rests upon the fruit. Fig. 6 of Plate I. shows this scale upon pear. 
For remedies see San Jose scale on a following page. 
*Bull. 69; Or. Exp. Station. 
