Insects and Insecticides 
33 
the ground where it hibernates. There is only one generation a year. 
See Figs. 23, 24 and 25. 
Remedies .—No practical method of control has been found. Col¬ 
lecting and destroying the infested berries will help, but is impractical, 
except on a small scale. Thorough cultivation to destroy the hibernat¬ 
ing form will help. Chickens running among the bushes will destroy 
many. 
Foliage 
Native Saw Fly .—A light green worm with a blackish head that 
feeds upon the leaves of currant and gooseberry bushes. The first 
brood appears in June and the second in August. The adult insect is 
a black four-winged fly about the size of the house fly that appears in 
the spring while the leaves are small ,and inserts the whitish eggs in 
the edge of the leaf between the two outer layers. The eggs form a 
blister-like elevation on the leaf. 
Remedies .—Four pounds ansienate of lead (4) or i pound Paris 
green (2) in 100 gallons of water will be found effective. These 
should not be used before the fruit is picked. The following may be 
safely used on the fruit, and are quite effective: White hellebore, i 
ounce to 3 gallons of water, or in the evening, thoroughly dust the 
leaves with the hellebore, or with pyrethrum. 
Imported or European Sazv Fly .—This pest has only recently been 
reported in Colorado. It is very similar to the preceding species, but 
is much more destructive. The larva can be distinguished from the 
native species by its dark head and numerous black specks on the body. 
The adult is somewhat larger than our native species. The small white 
eggs are placed in rows along the veins on the under side of the leaves. 
Remedies .—Same as for the preceding species. 
Currant Plant Louse .—The eggs are small shining black objects, 
and rather long in shape. They hatch, about as the buds be¬ 
gin to open, into a yellowish-green louse that feeds upon the opening 
buds and later upon the under side of the leaves. The numerous food 
punctures cause the leaves to curl and turn red and yellow in color. 
The lice remain on the currants all the season. Their favorite plant 
is the red currant, but they also attack the black currant and goose¬ 
berry. 
Remedies .—Same as recommended for green apple aphis. The 
leaves curl so tightly, spraying must be done before they begin to curl, 
for best results. 
Brown Mite and Red Spider .—These mites are often very abund¬ 
ant on currant and gooseberry. It is not uncommon to see bushes 
largely defoliated by them as early as July. See under Peach Foliage. 
