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Phytosphora in potato. Phytophthora infestans Photo by Scott Bauer from ars usda gov htm btnG Go ie asq imagenumber output xmlnodtd client usda referrer Fwww Ears Eusda Egov Fis Fgraphics Fphotos Fsearch Ehtm assitesearch www ars usda gov Fis Fgraphics Fphotos blight btnG SearchNow PDUSGov Phytophthora infestans