Arizona republican. [volume] (Phoenix, Ariz.) 1890-1930, 1895-04-09
SINUATE PEAR BORER.


views OF frOI. smith, OF the New Jersey
Experiment Station.
In the spring OF 1894 I received COM
plants from some farmers near Irving
ton, Essex county, N. j., of borer
that was injuring pear trees. Personal
investigation showed the presence of
an insect heretofore entirely unknown
to me, and of which had not seen any
notice in American literature. 1t was
beetle larva, and obviously belonged
to member of the genus Agrilus, an
allay of the larva producing gals on
blackberry and raspberry canes; but
no member of the genus was known to
attack fruit trees in the eastern United
States. found that in the entire Irv
ington and Hilton district, several
miles in extent, all the pear trees were
more or less infested and were sickly-
evidently dying off.
The bark on these trees showed
peculiar dark, somewhat depressed
lines, and was sometimes cracked.
Slicing off section down to the sap
wood, | found broad, shallow burrows
or channels, partly in the bark and
v
color, more or less filed with saw
dust and frass. These channels were
very irregular, zigzagging from side to
side, but not evenly; sometimes form
ing long bend to one side and a short
one to the other, or again reversing
this. Not only the trunks, but the
larger branches were attacked, and
1a+at- 7 foJ711 bot away,
or those Just set out. did not escape.
Following the course of the burrow.
the culprit would be found in the shape
of a white, fattened larva, varying
from half an inch to an inch or more in
length, the anterior segment very much
enlarged. the following two decidedly
smaller, and beyond that the joints were
moreover, but always strongly marked
the last ending in pair of little
brown curved points or hooks. Wher
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