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Phosphite is efficient towards late blight in potato under different growing conditions. Potato late blight infection in Sweden (A–C) and in Ethiopia (D). Untreated (A), fungicide Shirlan at recommended dose (B), a combination of potassium phosphite and half dose of Shirlan (C) and untreated to the left and combination of Rodimil and potassium phosphite to the right in the same photo (D). The combination with reduced dose of fungicide had the best effect against late blight.
