INJURIOUS INSECTS OF I909 AND IQIO. 10g 
Where trees are not too large, spraying 
with arsenate of lead, four or five pounds in 
a hundred gallons of water, should be an 
easy means of controlling this pest. In cases 
of large trees, bamboo extensions handled 
from elevated platforms would enable one to 
place the spray higher than when working 
from the ground; or one could, in an emer- 
gency, climb quite a distance up large trees 
with stout branches, carrying the bamboo 
extension. 
The Box Elder Twig Borer, is perhaps 
not, at this writing, a very serious pest, yet 
onkitgSt, Work of Box ee sm ies aes ae 
eh gives a good idea of the appear 
ance of the different stages of the insect, as 
well as the injury to box elders. The moth was identified for us, 
by W. D. Kearfott, as Proteopteryx willingana, described by him 
as a new species in 1904 (Canadian Ent., Vol. XXXVI, p. 306). 
The collecting and burning of infested twigs 
2 anes S° pues 
in June and July would be a desirable way of 
lessening their numbers. This insect was dis- 
cussed in the Twelfth Annual Report of the 
Minnesota State Entomologist, p. 97. At that 
time we had reared no males; and, from the _ Figs. 57 and 58. Larva 
: : and pupa of Box Elder 
females sent him, Dr. C. H. Fernald regarded it Twis-borer. Original. 
as Proteoteras aesculanum Riley. Specimens of males, however, 
were necessary to establish the exact identity of the insect. 
The Larch Saw Fly, Lygaeonematus 
ericksonu Hart, is an enemy of our tama- 
racks which has caused considerable alarm 
amongst Minnesota lumbermen. We as- 
signed the problem in its general and special 
aspects to Prof. Ruggles, of this division, 
" . who reports upon his 1909 and 1910 observa- 
Elder Twig-boree Original ‘tions as follows: 
