THE DAVEY INSTITUTE OF TREE SURGERY 
light, and can easily be found upon the blossoms of the golden rod 
or upon the sunny side of the trunk of the locust. They feed upon 
the pollen of the golden rod and upon the juices of other plants. 
They will feed freely upon sweetened baits. 
85. The eggs are laid upon the bark during the period when 
the golden rod is in bloom, the first adults appearing about the 
same time as the first golden rod blossoms. ‘The larve on hatch- 
ing burrow into the bark, and pass the winter in a small cell in the 
inner bark. The next spring they go deeper, burrowing through 
the cambium layer and later into the solid wood. The injury is 
so severe that the trees are girdled, or the heart-wood is so weak- 
ened that the tree is easily broken in a storm. The larva requires 
but one season to complete its growth. 
86. Control. A number of remedies have been suggested. 
One suggestion calls for the destruction of all locust trees; another 
the hand picking of the beetles, and a third the destruction of the 
golden rod, upon which the beetles feed. 
87. The more promising control measures include the use of 
repellents from the last part of August to the first part of October 
to prevent egg laying, the use of sweet poisoned baits to kill the 
beetles before they lay their eggs, and the spraying of the 
trunk and larger limbs in the fall with 
strong kerosene emulsion to kill the young 
larvee, which pass the winter in cells just 
under the outer hard bark. 
88. In all control measures, you 
should not overlook the importance of 
reducing the number of beetles by des- 
troying all badly affected or worthless 
trees during the winter or early spring, 
before the larve complete their 
growth. 
89. The trees can be prevented from 
sprouting by peeling the bark from the 
trunk during August. If the wood is 
valuable, the larve can be prevented 
from entering it by removing all the bark 
. . - bs Co rtesy x e of. cs) 
during the fall or winter. This will also ieee oS a 
pill the larve, as they are unable to de- a 
velop in the bark alone. Locust borer (female). 
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