206 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



duction to the plant pathologists, who are familiar with his many scien- 

 tific achievements. Some of the members of the American Association 

 of Economic Entomologists, however, may not be so fortunate as to 

 know Dr. Or ton personally, and to them I take pleasure in introducing 

 Dr. W. A. Orton, President of the American Phytopathological Society 

 who will preside this morning. 



President W. A. Orton : As retiring president of the Phytopatholog- 

 ical Society, I wish to express our appreciation of the invitation from 

 the Entomologists which has brought us together today and to express 

 our convictions that such meetings ought to come more frequently. 

 Perhaps they should have come earlier. It has even been suggested 

 that we in this countrv^ have made a mistake in developing two branches 

 of plant pest study and control separately and independently of each 

 other. At any rate, each passing year reveals new points of contact. 



We shall discuss today only one phase of the problem of control 

 wherein similar methods are used to combat both insects and diseases. 

 "A Symposium on Dusting as a Means of Controlling Injurious Insects 

 and Plant Diseases" is to be presented. 



The first paper will be given by Mr. P. J. Parrott, Geneva, N. Y. 



CONTROL OF SUCKING INSECTS WITH DUST MIXTURES^ 



By P. J. Parrott, Geneva, N. Y. 



The efficient protection of bush and tree fruits involves several factors 

 — the prevention and control of plant diseases, the repression of leaf- 

 and fruit-eating insects, and the destruction of certain haustellate 

 species which are commonly classified as scales, aphids, capsids, etc. 

 It is self-evident that no system aiming to afford protection to fruit 

 plantings satisfactorily meets practical necessities which does not secure 

 adequate control of all three categories of parasites. In considering 

 the merits of dusting as related to orchard management in New York, 

 there has been a great lack of experimental data regarding the value of 

 dusting in combating such insects as San Jose scale, blister mite, green 

 apple aphis, rosy aphis, leafhoppers and redbugs. Although apple scab 

 and codling moth usually levy the largest tribute, the shrinkage in 

 yields due to attacks of sucking insects is by no means insignificant 

 and during some seasons the acctimulative losses reach impressive 

 proportions. Certainly, no grower in this state is properly conducting 



'Condensed from a paper presented to the joint meeting of the Association and 

 the American Phytopathological Society at Chicago, Dec. 31, 1920. Typical tests 

 have been selected to illustrate the nature of the investigation and the average re- 

 sults secured. 



