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Low-Level Copper Plus Chitosan Applications Provide Protection Against Late Blight of Potato

L. A. Hadwiger and P. O. McBride

April 2006


This report describes a strategy for control of potato late blight using lower levels of copper sulfate pentahydrate in combination with a chitosan sticker and complexing agent. In excised leaf assays, this combination provided moderate control of late blight and protection against copper-related leaf yellowing at copper levels approximately 40 fold lower than those recommended for a commercial fungicide with copper hydroxide as the active ingredient.


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