Abstract

We evaluated spray programs for control of cherry leaf spot (caused by Blumeriella jaapii) during 1989-1991 in a sour cherry (Prunus cerasus) orchard in northern Michigan. Tebuconazole was as effective as chlorothalonil. Myclobutanil in combination with an adjuvant was next in effectiveness, followed by fenarimol and iprodione. Trees sprayed with the sterol demethylation inhibitor (DMI) fungicides fenarimol, myclobutanil, and tebuconazole also had a lower incidence of powdery mildew on the foliage than those sprayed with chlorothalonil or iprodione

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