Abstract
The ergosterol-biosynthesis inhibitor (EBI) fungicides myclobutanil, tebuconazole, diniconazole, and flusilazole were compared with chlorothalonil and triforine for the control of Entomosporium leaf spot on photinia. Applied weekly, myclobutanil (0.15 g a.i./L) was equal to or better than chlorothalonil (1.35 g a.i./L) for control of leaf spot, and these two fungicides were superior to triforine. Tebuconazole and diniconazole provided good disease control but reduced growth of plants. Application of myclobutanil at 2-wk intervals was efficacious in controlling disease. All of the fungicides tested controlled Entomosporium leaf spot, but only myclobutanil caused no phytotoxicity to photinia
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