60 
summer. The maggots commonly enter at the center of the crown of 
the radish and, after burrowing about until full-fed, make their exits 
at the side. The accompanying illustrations (figs. 4 and 5), by Miss 
Miriam Palmer, show the injuries of the maggot to a radish in cross 
and vertical sections. 7 
The destructive pea aphis (Vectarophora pisi Kalt.) was sent me 
last fall by Mr. J. H. Empson, of the Empson Packing Company, 
. Longmont, Colo. The lce were noticed in a 
few fields only, and they seemed to be entirely 
destroyed by their enemies before the season 
closed. It is my. first record of this imsect in 
Colorado. We shall doubtless hear more from 
it later. 
The melon aphis (Aphis gossypii Glover) is 
troublesome every year in the melon-growing 
districts, especially about Rockyford. The 
growers are fighting the louse by covering the 
vines with dirt as soon as they find lice upon 
them. 
ENEMIES TO FARM CROPS. 
The sugar-beet webworm (Lewostege sticti- 
calis Linn.) has been a very abundant moth at 
ae electric hghts in northern Colorado for years, 
\ but this year was the first that it has done ex- 
a tensive injury to sugar beets. It did some in- 
jury in a few limited localities in 1908, but not 
enough to occasion much- 
alarm. This year a mid- 
summer brood, the first 
3 week in July, did consider- 
i able injury to beets about 
J 
Rockyford, and a_ later 
brood was more destruc- 
Fra. 4._Section of radish, tive about Rockyford, 
showing injury from 
maggot of Anthomyia sp. 
(original). from the 10th to the 20th : 
of September. The first brood did no perceptible harm in northern 
Colorado, but the September brood caused thousands of dollars of 
loss in beet fields about Fort Collins, Greeley, and Sterling. Hun- 
dreds of acres of beets during September had all their leaves eaten 
away except the midribs and a little cluster of new leaves at the 
center. Wherever the injuries became severe the larve matured 
rapidly. A farmer might think his beets all right on Monday, and 
by Wednesday be convinced that the worms would take the entire 
crop. Poisons were used to good effect upon the beets, but the great- 
Fic. 5.—Cross-section of 
radish, showing injury 
Sugar City, and Lamar from Anthomyia sp. 
y (original). 
