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WARNING

The potato industry must not use commercially any chemical mentioned in this bulletin for table stock potatoes, except sodium arsenite, which must be applied at least 7 days before harvest and dinitro-ortho-secondary butylphenol must be applied at least 10 days before harvest. Do not apply either of these chemicals to exposed tubers. The chemicals that are italicized in this bulletin have not been registered with the Pesticides Regulation Division, U.S. Department of Agriculture, as potato vine killers. At this time, these chemicals should be used for experimental or investigational application only.

Chemicals can be hazardous, not only to humans, but to domestic animals, wildlife, and fish. They should be handled with extreme care. The precautions on the container label should be followed carefully.

When handling or mixing any chemical, avoid spilling it on the skin and keep it out of eyes, nose, and mouth. If any is spilled, wash it off the skin and change clothing immediately. If it goes in the eyes, flush with plenty of water for 15 minutes and get medical attention.

This report contains results of a cooperative study conducted through the 1950's by the Agricultural Research Service and the Agricultural Marketing Service, U.S. Department of Agriculture. The information has earlier been made available in somewhat fragmentary form within the Department of Agriculture, but has not been given general distribution. General publication has been delayed because of unavoidable factors. Although this work was done some time ago, the results are still valid. The equipment and techniques have not changed, and the research results are of current usefulness. This report is a part of a broad program of continuing research aimed at improving efficiency and holding down costs in the marketing of farm products.

T. M. Whiteman (now retired), W. R. Wright, J. M. Lutz, and J. C. Hansen (now with Colorado State University) Agr. Mktg. Serv., and A. J. Dubuque, Agr. Res. Serv., assisted in the study; the Red River Valley Potato Growers Association furnished the potatoes and performed the ordinary cultural operations on the experimental plots; the North Dakota Agr. Exp. Sta. loaned a special potato planter; the Dow Chemical Co., the Pennsylvania Salt Mfg. Co., the American Cyanamid Co., Sharples Cheimcals, Inc., The Naugatuck Chemical Division of the U.S. Rubber Co., Agsco, E. I. DuPont de Nemours & Co., Inc., the B. F. Goodrich Chemical Co., the Monsanto Chemical Co., the Atlas Powder Co., and Standard Agricultural Chemicals, Inc., supplied the chemicals used; the Woolery Machine Co., furnished the Potato Vine Burner; the Silbaugh Mfg. Co., furnished the Humboldt Stalk Cutter; the Myhra Equipment Co., furnished the Brady Stalk Pulverizer; the John Bean Division of Food Machinery & Chemical Corp. furnished the Rotobeater; F. Irons, Agr. Res. Serv., loaned the special self-propelled precision duster and made feed-rate calibrations of the dusts used; and E. J. Koch, Agr. Res. Serv., gave advice on the statistical analysis of the results.

W. L. Smith, Jr., Agr. Mktg. Serv., initiated the work; his unpublished data formed the basis for the studies reported here.

The use of trade names is for identification only and does not imply endorsement by the Department of Agriculture of the machine or product mentioned or disapproval of other machines or products.

Washington, D.C.

July 1964

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