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Efficacy of Fungicides for Control of Entomosporium Leaf and Berry Spot of Saskatoon

October 1998 , Volume 82 , Number  10
Pages  1,137 - 1,141

Ralph M. Lange , Plant Pathologist, Alberta Research Council, Vegreville, AB Canada T9C 1T4 ; Piara S. Bains , Research Scientist, Crop Diversification Centre-North, Alberta Agriculture, Food and Rural Development, Edmonton, AB Canada T5B 4K3 ; and Ronaldo J. Howard , Leader, New Crop Development Unit, Crop Diversification Centre-South, Alberta Agriculture, Food and Rural Development, Brooks, AB Canada T1R 1E6

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Accepted for publication 30 June 1998.

Studies were conducted to identify non-phytotoxic fungicides that would effectively control Entomosporium leaf and berry spot of saskatoon. Of 13 fungicides tested, benomyl, imazalil, myclobutanil, propiconazole, and thiophanate-methyl completely restricted in vitro radial growth of a monoconidial Entomosporium mespili isolate. Chlorothalonil, imazalil, propiconazole, and thiophanate-methyl completely inhibited conidiospore germination in vitro at 1 ppm a.i., the lowest concentration tested. In 1995, chlorothalonil and propiconazole provided the best control of Entomosporium leaf and berry spot at three orchard test sites in Alberta, Canada, while benomyl was also effective at two of these sites. Multiple applications of chlorothalonil (970 g ha--1) and propiconazole (125 g ha--1) effectively reduced disease severity at two of three test sites in 1996.

Additional keywords: Amelanchier alnifolia, Fabraea maculata, serviceberry

© 1998 The American Phytopathological Society