104 INJURIOUS INSECTS OF IQ0Q AND IQIO. 
The year 1910 has been an exceptionally bad one as regards 
borers and other pests on shade trees. Some of the finest elms in 
the Twin Cities have either died from the attacks of the Elm Borer, 
or have had their certain death anticipated by a free use of the axe 
in order to save other trees not yet attacked. The Elm Borer per- 
forates the bark, loosening it from the underlying wood, and bores 
on the surface of the wood under the bark. This pest can easily 
Fig. 51. Work of Elm Tree Borer. Tree in fore-ground killed. Original. 
