PART NINTH: FRUIT PROTECTION. 
CHAPTER XXXVI. 
INJURIOUS INSECTS. 
The California climate, which so favors tree and plant by a 
long, mild growing season, also enables some insects to multi- 
ply much more rapidly than they do in wintry climes, some 
having several distinct broods, others carrying on the work of 
reproduction and destruction of plants nearly the year round. 
If, however, as now seems likely, a good part of the repression 
of injurious insects may be trusted to other. insects, parasitic or 
predatory, the climate will favor the multiplication of friend as 
well as foe, and thus carry its own compensation. This result 
has been promoted by the introduction of beneficial insects 
from other parts of the world. It is also a fact that California 
fruit growers have invented methods and appliances for re- 
pression of injurious insects which have demonstrated notable 
efficiency and value. 
In order to arrange injurious insects in classes in a popular 
way, the grouping will be based upon the character of the work 
they do, an arrangement which has been followed by other 
writers, and which is better than attempting to group the insects 
which prey upon any single tree or plant, because injurious in- 
sects seldom restrict themselves to a single food plant. There- 
fore the grouping will be as follows: (1) Insects destroying foli- 
age; (2) insects upon the bark or upon the surface of leaf and 
fruit; (3) insects boring into the twig, stem, or root; (4) insects 
boring into the pulp of fruits. 
The literature upon the subject of insect pests in California 
is quite extensive, but much of it is beyond the reach of the 
general reader. There are, however, a number of publications 
which should be on the shelves of every fruit grower, and these 
are the bulletins and reports of the experiment stations of the 
University of California, at Berkeley; of the State Board of 
Horticulture, at Sacramento: and of the Division of Entomology, 
of the LU. S. Department of Agriculture, at Washington. The 
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