Item 13199 - Spraying potato fields, ca. 1940

Item 13199 - Spraying potato fields, ca. 1940
Contributed by Caribou Public Library
Item 13199
Spraying potato fields, ca. 1940
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Spraying with soluble copper sulfate (Blue Vitrol) and insecticide helps keep insect pests and plant diseases under control to help produce a marketable potato crop.

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