REPORT Us THE DEPARTMENT OF ENTO- 
MOLOGY. 
ae LOR AR AND WILLOW: BORER 
(Cryptorhynchus lapathi L.) 
W. J. SCHOENE. 
SUMMARY. 
This bulletin deals with the poplar and willow borer, an 1m- 
ported beetle, which is causing extensive injuries to nursetv 
stock and basket willows, and threatens ornamental poplars 
and willows. 
This species has one brood a year. Egg-laying occurs during 
August and September, and from eighteen to twenty days are 
required for the eggs to hatch. The larval stage lasts till the 
following July when pupation occurs. The pupal period occu- 
pies about two weeks and the beetles commence to appear about 
July 15... From this date they may be found until the middle 
of October. | 
To avoid injuries by the beetle, new plantations of poplar and 
willow should not be planted near old blocks. In plantings 
subject to slight attacks, the borer may be controlled by cutting 
out and destroying in June the parts affected with the grubs. 
The numbers of the insect will be reduced by burning all 
branches and trees broken by the wind or otherwise injured and 
rendered unsalable. 
Observations have been made of the feeding habits of the 
beetles which show that they do not discriminate between 
sprayed and unsprayed plants, and that beetles feeding upon 
sprayed plants succumb in three or four days. It is believel 
that nurserymen could avoid important injuries by this insect 
by spraying during July with bordeaux mixture containing an 
arsenical poison. Experiments are now being conducted to 
determine the value of this treatment. 


* A reprint of Bulletin No. 286. 
[197] 
