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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 18 
and grape, small fruits such as grape and blackberry, orchard fruits 
including apple and sweet cherry, ornamental shrubs, particularly 
althea and rose, flower garden flowers of all kinds, field crops such as 
clover blossoms, soy beans and corn, and shade and timber trees 
including linden, birch, oak, elm and horse chestnut. The beetle does 
not defoliate, but rather skeletonizes the leaves which often turn brown 
and drop off. In this way grape vines are riddled, entire orchards of 
apples appear brown because of the injury, even shade and timber 
trees are similarly browned to the tops. Clover flowers are eaten and 
the silk of cotfn cut off in such a way as to prevent proper fertilization 
and there is every reason to believe that injury to these crops can 
acquire a considerable importance. The insect is not, according to 
Professor S. I. Kuwana, a pest of great importance in Japan, although 
it does occasionally damage grape and soy bean, the latter especially. 
The fact that this beetle is of little importance in its native home only 
indicates that it is there held under reasonable control by natural 
conditions or natural enemies, or both. The data at hand indicate 
that the species has every ability to be a pest of prime importance to 
the agricultural interests of almost any community where it becomes 
established unless held sufficiently in check by natural enemies. 
Difficulties of Control 
The insect is a strong flier, very active, easily carried in vehicles, on 
one’s person and on marketable foodstuffs, flowers, etc., as has been 
repeatedly demonstrated, feeds on a large variety of crops including 
the lowest growing plants to the largest timber trees, spends a greater 
part of its life underground where it is difficult to reach, multiplies with 
remarkable rapidity and lacks its native natural enemies. For these 
reasons and because it has become so firmly established, because the 
conditions in Burlington and Camden Counties, New Jersey, where it 
occurs are so favorable for the insect,—the headlands, fence rows,, 
creeks, and roadsides being grown up and forming a network of favor¬ 
ite food plants and breeding grounds—and finally because the beetle 
is only moderately affected by poison and is strongly repelled by prac¬ 
tically all arsenicals, the species is difficult to control and apparently 
impossible to eradicate without the expenditure of very large amounts 
of money. Prevention of spread is difficult, but not impossible and 
with the plans now under way and a quarantine service, as anticipated, 
we have every reason to believe that spread another season will be 
appreciably minimized. 
Limits of Infestation 
The green Japanese beetle is known to occur in the United States 
only in portions of Burlington and Camden Counties, New Jersey. 
