THE SAN JOSE SCALE AND ITS CONTROL. Et 
This list might be materially extended by recording those plants 
upon which the insect has at various times been taken but to which 
it is not especially injurious. The fears earlier expressed that the 
scale would eventually seriously infest our native forest growth have 
not been borne out, and in effect it requires treatment only on fruit 
trees, bush fruits, and ornamental trees and plants. 
NATURAL ENEMIES. 
The San Jose scale is subject to attack by numerous predaceous 
and parasitic enemies, which render important service in its control. 
Practically, however, the combined influence of these several agen- 
Fic. 8.—The pitiful ladybird: a, Beetle; 6, larva; c, pupa; d, blossom end of pear, showing scales with 
larvee of ladybird feeding on them, and pup of ladybird attached within the calyx. All greatly enlarged. 
(From Howard and Marlatt.) 
cies is not sufficient to make up for the enormous reproductive 
capacity of this insect. To preserve the plants from destruction, its 
control must be accomplished by artificial means, such as the use of 
sprays. 
Among the more common predaceous insects which are observed 
feeding on the scale is the so-called pitiful ladybird,’ illustrated in 
figure 8. This very small, convex, black beetle may generally be 
found by any observant person on scale-infested trees. 
Another species that feeds very commonly on this and other scale 
9 
insects is the twice-stabbed ladybird.2. This is a very near relative 
1(Pentilia) Microweisea misella Lec, 2 Chilocorus bivulnerus Muls, 
