Summary
Working with the Irish Cobbler, Rural Russet and Green Mountain varieties of potatoes at Pittsford, N. Y., it was found that all these varieties respond to copper treatments in the form of bordeaux mixture to approximately the same extent in final increases in yields. Using a Bordeaux mixture composed of the equivalent of half as much quick lime as copper sulfate, and applying most of the copper early in the season, there appeared to be no advantage in using more than a total of 60 pounds of copper sulfate per acre during the season.
All copper-sprayed plants retained more tubers per plant than unsprayed plants of the same variety.
All varieties showed evidence of a retardation in tuber development due to spraying. The retardation was less pronounced with the Cobblers and most pronounced with the Green Mountains. In the Green Mountains, the unsprayed plants yielded more than the sprayed until after September 21.
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Barrus, F. M. and Crosby, C. R. 1934. Control of diseases and insect pests of potatoes in up-state New York. Cornell Extension Bul. 238: 1–31. 6 figs. Revised.
Blodgett, F. M., Mader, E. O., Burke, O. D., and McCormack, R. B. 1933. New developments in potato spraying. Amer. Potato Jour. 10(5): 79–88. 3 figs.
—, and —. 1935. Three years’ results using bordeaux mixture with reduced amounts of lime as a potato spray. Amer. Potato Jour. 12(7): 171–177.
Mader, E. O. 1934. The effect of varying the concentration and the lime to copper ratio of bordeaux mixture in potato spraying. Amer. Potato Jour. 11(5): 111–117. 2 figs.
-. 1935 Thesis (in preparation) Cornell University.
—, and Blodgett, F. M. 1935. Effects of modifications of the potato spray program. Cornell Agr. Exp. Sta. Bul. 621: 1–34.
—. 1935. Potato spraying and potato scab. Amer. Potato Jour. 12(6): 137–142.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02870998.
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Mader, E.O., Blodgett, F.M. The response of different varieties of potatoes to different amounts of copper in a modified spray program. American Potato Journal 12, 325–334 (1935). https://doi.org/10.1007/BF02879179
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DOI: https://doi.org/10.1007/BF02879179