REPORT OF THE ENTOMOLOGIST. 



United States Department of Agriculture, 



Bureau of Entomology, 

 Washington^ D. (7., Sefteniher 19, 1918. 



S'ir: I submit herewith a report of the work of the Bureau of 

 Entomology for the fiscal year ended June 30, 1918. In accordance 

 with your instructions, I have confined this report to concise state- 

 ments of work performed during the j-ear, with emphasis on the 

 activities having a direct bearing on war j^roblems. 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. D. F. Houston, 



Secretary of Agriculture. 



DECIDUOUS-FRUIT INSECT INVESTIGATIONS. 



Investigations of deciduous-fruit insects have been carried out 

 under the direction of Dr. A. L. Quaintance, as in preceding years. 



APPLE INSECT INVESTIGATIONS. 



Codling moth. — Biological studies of the codling moth have been 

 continued, and a large amount of experimental work has been done 

 in orchards bearing upon various practical points in the control ol 

 this serious pest. Spraying experiments, carried on in cooperation 

 with the Colorado Agricultural Experiment Station, in the Grand 

 Valley of Colorado, have indicated that a schedule of six applica- 

 tions of arsenate of lead at the rate of 4 pounds of the powdered 

 product to 200 gallons of water, with the addition of 4 pounds of 

 fish-oil soap, will make a very effective treatment for the orchards 

 in that valle3^ 



In the RogTie River Valley, Oreg., the codling moth is not only 

 seriously injurious to apples, but causes a large loss by injury to 

 pears. Therefore, in cooperation with the Oregon Agricultural Ex- 

 periment Station, extensive studies were undertaken in the fall of 

 1917 with headquarters at Medford. This work was begun so 

 recently that it is too early to report results. 



At the same time this bureau and the Bureau of Plant Industry es- 

 tablished a joint laboratory at Bentonville, Ark., for the study of 

 apple and other insects and diseases in that region. This work is 

 meeting with the hearty cooperation of the orchardists. Other ex- 

 periments are in progress in southwestern Missouri and in Arkansas, 

 with Bentonville as headquarters. 



Orchard spraying work is also being carried on, in cooperation 

 with the New Mexico Agricultural Experiment Station, in the Pecos 

 Valley, N. Mex. Here the effort is directed toward determining 

 the comparative merits of different numbers of spray applications 



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