INSECT PESTS AND PLANT DISEASES 
93 
RED SPIDER. 
An almost microscopic mite which attacks Evergreens 
especially. The trees or plants affected start to decline, 
for no apparent reason, but a close examination will often 
reveal numbers of minute mites on the twigs and leaves. 
There is generally a sort of silvery web over some of the 
twigs. 
Control: Dust with flowers of sulphur. Several ap¬ 
plications are generally required for results. 
SAN JOSE SCALE. 
Attacks fruit trees and certain shrubs, causing scale¬ 
like spots about the size of a pin-head, grayish-brown in 
color, under which the insect lives. The damage is done 
by the insect sucking the sap. 
Control: Spray in Winter or early Spring before the 
buds open, with lime-sulphur solution, mixed according to 
directions accompanying the package. Spraying must be 
thoroughly done as only the insects hit by the spray are 
killed. 
WER WORM (Fall Web Worm). 
The caterpillars make a sort of a web in which hun¬ 
dreds may feed. Attacks Walnut, Sumach, Ailanthus, and 
other trees. Generally two generations a year, one in 
early Summer, and the second in early Fall. Where there 
are only a few webs the webs may be destroyed and the 
caterpillars crushed. Where very numerous spray with 
arsenate of lead as for caterpillars. 
