442 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 5 



pounds of lead arsenate paste to fifty gallons of water is an efficient 

 and safe spray. 



If Paris green is used one pound per acre applied dry or two pounds 

 to fifty gallons of water with one pound of lime added, is all that can 

 be safely applied. 



Natural Enemies. Insect-eating birds devour the worms in large 

 quantities and are the best friends of the farmer. When the worms 

 are abundant blackbirds will be attracted in flocks of hundreds; cases 

 have been reported where they completely destroyed the worms. The 

 most useful birds are the blackbird, meadow lark, English sparrow and 

 quail, in Europe the English sparrow heads the list. 



This pest is unusually subject to parasitism by several species of 

 Hymenoptera and Diptera. One of the most common is the parasitic 

 fly Agathis (Cremnops) vulgaris. This parasite has often been re- 

 ported as the means of preventing the August brood of moths from 

 becoming destructive. By means of a long ovipositor it inserts an 

 egg in the body of its host, which may be the larva or pupa. The 

 limited number of this parasite is due to a secondary parasite Meso- 

 chorus agilis Cress. 



Much valuable assistance has been given the writer by Prof. C. P. 

 Gillette and Prof. S. Arthur Johnson of the Colorado Experiment 

 Station, Mr. W. L.. Lawson of Sterling, Colorado, and Mr. Oscar 

 Rabbethge of Germany. 



September 10, 1912. 



References 



1892. Riley, C. V. The Sugar-Beet Web Worm. Annua! Report of the Entomolo- 



gist. 



1893. Maxwell, Waltek. Report of Station Work at Schuyler, Nebraska. (Men- 



tion of the outbreak). Bureau of Chemistry, Bulletin No. 36 pp. 51-54. 

 1893. Riley, C. V. The Sugar-Beet Web Worm. Bureau of Chemistry, Bulletin 



No. 36 pp. 68-70. 

 1893. Bruner, Lawrence. The Beet Web Worm. Bureau of Entomology 



Bulletin No. 30. (0. S.) pp. 37-40. 



1893. Howard, L. O. The Sugar-Beet Web Worm. Insect Life, Vol. V. pp. 320- 



322. 



1894. Howard, L. O. Complete Life History of the Sugar-Beet Web Worm. In- 



sect Life, Vol. VI. pp. 369-373. 



1899. Pettit, R. H. Garden Web Worm. Michigan Experiment Station, Bulletin 



No. 80 p. 254. 



1900. Forbes, S. A. The Beet Web Worm. Twenty-First Report of the State 



Entomologist of Illinois. Pp. 109-111. 



1901. Stift, a. The New Beet Pest. Ueber die im Jahre 1901 beobachteten 



Ivrankheiten der Zuckeniibe. 



1902. Stift, A. Exmjcreon stidicalis L. Ueber die im Jahre 1902 beobachteten 



Krankheiten der Zuckeniibe. 



