Potato plants with late blight, caused by Phytophthora infestans.

The most important potato leaf diseases are late blight (Phytophthora infestans), early blight (Alternaria solani) and brown spot (Alternaria alternata). Yield losses for potato blight range from 40 to 100% in unsprayed potato crops with an increase in virulence from these pathogens.

We are currently evaluating quick, reliable screening methods against these diseases for the potato breeding scheme at ARC-VOP. Fungicide resistance of pathogens is a growing problem world-wide.

Part of our research includes screening of Alternaria species for resistance to commonly used fungicides, in order to provide correct advice to farmers.

Contact: Dr Rene Sutherland or Dr Elsie Cruywagen

​ ​Potato plants with leaf spots caused by Alternaria species.



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