SB 
818 
ea7 
ENT 
8 
£05) Tie Issued March 7, 1910 
United States Department of Agriculture, 
BUREAU OF ENTOMOLOGY, 
L. O. HOWARD, Entomologist and Chief of Bureau. 
CONTROL OF THE MEDITERRANEAN FLOUR MOTH BY 
HYDROCYANIC-ACID GAS FUMIGATION. 
By F. H. Cuirrenpen, Sc. D., 
In Charge of Truck Crop and Stored Product Insect Investigations. 
INTRODUCTORY. ~ 
Until in somewhat recent years flour mills in the United States 
were little troubled with injurious insects. It is true that weevils 
and other granary pests were brought into the mills with grain, and 
in the course of time many mills have become infested with flour 
beetles.¢ Beginning with the year 1892, however, several Cali- 
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Fic. 1.—Mediterranean flour moth ( Ephestia kuehniella): a, Moth; 6, Fig. 2.—Mediterranean 
same from side, resting; c, larva; d, pupa; e, abdominal segments flour moth: Larva, 
oflarva. a-d, Enlarged; e, moreenlarged. (Author’s illustration.) dorsal view. (Au- 
thor’s illustration.) 
fornia mills became infested by the Mediterranean flour moth 
(Ephestia kuehniella Zell.), which has been aptly called “‘the scourge 
of the flour mill” and the ‘‘ winged gray plague.” At first its progress 
in this country was slow, but in less than a decade it had become 
recognized as a most serious pest in many States, and at the present 
time it is known to occur in practically all of our principal milling 
centers, and in most of our States from the Atlantic to the Pacific 
and from Canada to Mexico. 
a Chiefly species of Tribolium, Czenocorse (Palorus), Gnathocerus, et-a 
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