22 
THE COLORADO EXPERIMENT STATION 
treated in the same way as the apple plant-louse mentioned above. 
The black peach aphis, which does its chief injury to the roots, 
should be handled in the same manner as the woolly aphis of the 
apple. 
INSECTS INJURIOUS TO THE GRAPE. 
THE ACHEMON SPHINX. (Pholus achemon.) 
Hairless caterpillars devouring the leaves. When small, each 
caterpillar has a long dorsal spine on the last segment of the body. 
When nearly grown, the spine is represented by a shining black 
spot. These larvae resemble the large tomato “worm.” 
Remedies .— Any of the arsenical poisons (3, 4, 5, 6, 7, 8) may be used 
as recommended for apple leaf-rollers. Pyrethrum (24) may also be used 
as powder or spray, but to kill, it must come in contact with the cater¬ 
pillars. Handpicking is the best remedy in a small vineyard. 
This insect is also bad on Virginia creeper. 
THE EIGHT-SPOTTED FORESTER. (Alypia octomaculata.) 
A dark-colored caterpillar, about one and one-half inches long 
when fully grown. A close examination will reveal numerous 
small black and white cross lines and a few red ones to each body 
segment. See Plate 3, Fig. 2. 
Remedies .— The same as for the preceding species. 
This insect also infests the Virginia creeper. 
STEM BORER. 
See apple twig-borer, which also attacks the grape. 
TREE CRICKETS. [CEcanthus sp.] 
The female cricket punctures stems of grape and other plants 
and in each puncture deposits a long cylindrical egg. The punc¬ 
tures are usually in rows lengthwise of the stem and look like 
needle thrusts. 
Remedies. Cut out badly infested stems. Keep the vineyard clean 
ot all weeds. 
COTTONA SCALE. [Pulvinaria innumerabilis .] 
This scale, commonly found infesting soft maple, sometimes 
attacks grapevines. See Plate I., Fig. 2." 
Remedies . —Kerosene emulsion made strong, so as to be one-fifth kero¬ 
sene, thoroughly sprayed during the winter or early spring is very ef¬ 
fectual. TV hen the little lice first hatch from the scales, about the last of 
no? e ’-n h S °^ dina fy sprays of kerosene emulsion (14) or whale-oil soap 
(12) will destroy them. If the spraying is delayed till a heavy scale has 
formed over the lice, stronger applications will be required. 
