214 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



and policies, and to that extent should promote a sane solution of the 

 problem of dusting for the control and suppression of crop pests. The 

 task is admittedly not a simple one. It is the usual experience, however, 

 that difficulties lessen as we approach them with open minds, show a 

 disposition to be fair, and a determination t ) reach the result which the 

 facts rather than our predilections require. The collection and tabula- 

 tion of existing experimental data will form the foundation upon which 

 subsequent progress will be built. We may hope, therefore, that the 

 future will bring order out of the chaos of conflicting opinions which 

 exist with respect to a large field of significant data. The program may 

 seem ambitious, but responsibility for action largely rests with the scien- 

 tific workers in the two branches of effort. Ours is the task to create a 

 stimulus and arouse an interest which shall bear fruit in practical 

 endeavor. 



PRESiDENT W. A. Orton: Mr. T. J. Headlee will now discuss his 

 experiences with Dusting to control Sucking and Biting Insects, with 

 special reference to the plum curculio and the codling moth. 



DUSTING AS A MEANS OF CONTROLLING INJURIOUS 



INSECTS' 



By Thomas J. Headlee, Ph.D., New Brtmstdck, N. J. 



Late in the year 1912 the writer reached the conclusion that the 

 development of powdered arsenate of lead and of finely divided sulfur 

 had reached a point where further experim.ents on the relative value of 

 dusts and sprays for control of insects injurious to apple and peach 

 should be undertaken. In cooperation with Mr. F. H. Pough of the 

 Union Sulfur Company and Mr. CD. Vreeland of the Vreeland Chemi- 

 cal Company, a plan for attacking this problem was worked out and at 

 the Cleveland Meetings of this society this plan was gone over and 

 modified by Mr. F. M. Blodgett, Dr. Reddick and Dr. Whetzel of the 

 Cornell Agricultural Experiment Station. This plan involved similar 

 tests in certain of the Experiment Stations of the United States east of 

 the Rocky Mountains, selected from, the standpoint of the fruit growing 

 industry. This plan included a test of a dust composed of finely divided 

 sulfur and powdered arsenate of lead as compared with the sam_e m-ateri- 

 als delivered in suspension in water and as compared with the standard 

 comjmercial liquid treatments for the crop in question. The idea of 



'Paper 18 of the Technical Series, N. J. Agricultural Experiment Stations, Depart- 

 ment of Entomology. 



