6 FARMERS’ BULLETIN 1741. 
only a few inches, but during the warm months the adults crawl 
during the greater part of the day or, in July and August, of the 
night. Although they use up much of their energy in climbing up 
and down plants, and into and out of crevices in the ground, so that it 
is largely wasted so far as progress is concerned, a little of it happens 
to lead to new fields. There is no general movement by crawling, 
any more than by flight, from the fields to the ditch banks, fence 
rows, and similar places, or from such places to the fields, at any time. 
The crawling is most 
important, as has 
been shown, in bring- 
ing weevils into hay 
and so into traffic, 
which probably takes 
them somewhat far- 
ther than they could 
go without help. 
During the 12 years 
that the alfalfa wee- 
vil has been in Amer- 
ica it has spread into 
new territory very 
slowly and has agree- 
ably disappointed 
those who feared that 
it would extend rap- 
idly over all the 
alfalfa-producing re- 
gions of the conti- 
nent. Its progress 
is so slow that there 
is hope of providing 
control methods for 
new climates and 
conditions as fast as 
these are encoun- 
Fig. 4.—The alfalfa weevil: Work of the larvie. (Original. ) tered. Thereis hope 
also that the pest will not prove equally injurious under all cireum- 
stances. It is much less harmful in Europe than in America, owing 
apparently to climatic and industrial conditions, and it multiplies 
more slowly and does less damage in the higher altitudes in Utah 
and Wyoming than in the lower valleys, Nevertheless, it is possible 
that eventually every section of the country will have to consider, 
first, the problem of keeping the insect out of its boundaries, and 
later, the problem of growing alfalfa in spite of the weevil, or finding 
