106 INJURIOUS INSECTS OF I909 AND IQIO. 
To protect trees not al- 
ready attacked, or not se- 
verely injured, I would 
suggest several applica- 
tions, beginning not later 
than May ist, and repeat- 
ing at intervals during the 
summer, of a compound 
composed of thick white- 
wash to which crude car- 
bolic acid has been added 
at the rate of I quart of 
crude acid for every pailful 
of whitewash, and arsen- 
ate or | leads > about six 
pounds for every fifty gal- 
lons of the wash. This 
wash could be colored with 
lampblack, making it grey 
and inconspicuous. It 
would, of course, brush off 
on the clothes of those 
touching the trees. This 
should be applied with a 
white-wash brush, over the 
trunk and the lower por- 
HONS Ol. thems lyditeore f 
branches. 
The larval borers, found 
in the burrows, are white 
and somewhat flattened. 
The beetles are brown, 
with a red stripe on the 
outer edge of each wing-cover, from which stripe three tooth-like 
projections of the same color project toward the center of the back. 
Fig. 52. A near view of work of Elm 
Tree Borer. Original. 
We find in our notes a record of finding this pest as far back 
as November 6th, 1908, on which date we collected borers from 
the trunks of five trees on the corner of 27th Street and rst Avenue, 
South, Minneapolis. They were most numerous close to the ground. 
In one tree they were numerous enough to have easily killed it. In 
1909 injuries from this pest materially increased, and large numbers 
