60 



Slimmer. 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. 



The destructive pea aphis {Nectarophora pisl Kalt.) was sent me 

 last fall by Mr. J. H. Empson, of the Empson Packing Company, 

 Longmont, Colo. The lice 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 insect 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 Avith dirt as soon as they find lice upon 

 them. 



ENEMIES TO FARM CROPS. 



The sugar-beet webworm {Loxostege sticti- 

 calis Linn.) has been a very abundant moth at 

 electric lights in northern Colorado for years, 

 but this year was the first that it has done ex- 

 tensive injury to sugar beets. It did some in- 

 jury in a few limited localities in 1903, but not 

 enough to occasion much 

 alarm. This year a mid- 

 summer brood, the "first 

 week in July, did consider- 

 able injury to beets about 

 Hockyford, and a later 

 brood was more destruc- 

 tive about Rockyford, 

 Sugar City, and Lamar 

 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. A\lierever the injuries became severe the larva? 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- 



FiG. 4.— Section of radish, 

 showing injury from 

 maggot of Anthomyia sp. 

 (original). 



Fig. 5.— Cross-section of 

 radisli, showing injury 

 from Anthomyia sp. 

 (original). 



