Insects of Shade Trees and Their Control: 65 
Prevention.—In localities where it is still absent, guard against in- 
troduction of the borer in posts or other products having the bark 
on. Regularly each year locate and destroy 
entirely or remove the bark from infested 
trees. Secure cooperation of neighbors in the 
work, so far as possible. Finally, allow all 
the undergrowth possible and keep growing 
trees untrimmed so that they will be well 
shaded when the beetles fly. The beetles, being 
sun loving, will not lay eggs on shaded trees. 
MOTTLED WILLOW 
AND POPLAR BORER.” 
How injurious — 
This is a most serious 
enemy of willow and 
poplar trees, the limbs 
and trunks of which it | 
4 . Fic. 44.—Grub of the mot- 
tunnels until they die ~ tea witlow and poplar 
or break in the wind. Porer. Enlarged. (Chit- 
; 5 5 tenden.) 
It found its way into 
this country a number of years ago and has 
since established itself in practically all the 
Northern States. 
How recognized.—Dead or dying limbs; 
swellings, and dead patches of bark often 
cracked open on limbs or trunk, fading foli- 
age, and “sawdust” and oozing sap at points 
of attack are signs of infestation. Fresh 
punctures made by the beetles while feeding 
on the younger shoots are also in evidence. 
Injured twigs, when split open, disclose bur- 
rows, mostly along the middle, and within 
each is a fleshy, white, footless grub (fig. 44) 
Mig. 45.—Poplar braneh about one-half inch long when full grown. 
showing work of larva and Habs 1 ; Tl “ads ll 
Paticturbsl made: by ‘beetle abit and appearance.—The grub is usually 
of mottled willow and full grown about June or July, pupates, and 
poplar borer (near bottom tur to tl dul Teele isa. rath tock 
at right) ; also beetles, Urns to the adult, which is a rather stocky, 
Natural size. (Chitten- dark colored snout-beetle (fig. 45) about 
den.) tl * : ] ] . BO é 
iree-eighths inch long, with spots and rear 
third of the wing covers pinkish white. For a week or two after 
emerging the beetles feed on the young bark and then the females 
begin to gouge out cavities in the bark of 2 to 4 year old growth and 
ity 
SSS 
% Oryptorhynchus lapathi L. 
5692°—21—_5 
