THE DAVEY INSTITUTE OF TREE SURGERY 
97. ‘The control, as far as known, is the same as-for the apple 
tree ore é., protecting the trunk and exposed roots from 
ttack. 
¥ 10. POPLAR BORER 
Family CERAMBYCID. Species Saperda calcarata Say 
98. This is the largest of our native Saperdas, measuring from 
one to one and one-fourth inches long. Together with the broad- 
necked Prionus, it makes it next to impossible, in many sections, 
to grow the Lombardy poplar. The larva is nearly two inches long, 
making a half-inch burrow under the bark and through the heart- 
wood. Packard regorts taking eight to ten larve from a section 
of a five-inch trunk ten inches long. 
99. It causes serious injury to Lombardy poplar, cottonwood, 
quaking aspen and willows. It has also been reported from apple. 
The adults can be found on the trees during August and Septem- 
ber in the northern states. 
100. The nature of its work and the lack of a full record of 
the habits and life history of the species make it difficult to know 
the best methods of control. Digging out the larve, the use of 
carbon bisulphide in the burrows and the use of repellents to pre- 
vent egg laying, are the only remedies to be suggested. ‘The de- 
struction of badly infested trees will also help to reduce the injury, 
by reducing the number of beetles. 
11. BROAD-NECKED PRIONUS 
Family CERAMBYCIDZ. Species Prionus laticollis Drury 
101. This is one of the largest of the borers belonging to this 
family. The beetles, one to one and one-half inches long, are broad, 
black, and have three irregular teeth on either side of the thorax. 
The larve are round-headed borers with rudimentary legs, and 
when full grown, are fully three inches long. They burrow in the 
trunk and roots of Lombardy poplar, balm of Gilead, black oak, 
pine, apple and grape vines. Most of their work is underground, 
making them difficult to control. 
12, OAK TWIG PRUNER 
Family CERAMBYCID/. Species Elaphidion villosum Fabr. 
 ] 102. While this species is a typical round-headed borer, it has 
f peculiar habit that throws it into a class by itself, as indicated by 
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