Control of Pear and Apple Diseases in Israel with Sterol-Inhibiting Fungicides. E. Shabi, Division of Plant Pathology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel. E. Elisha, and Y. Zelig, Division of Plant Pathology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel. Plant Dis. 65:992-994. Accepted for publication 12 March 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-992.

Results obtained from fungicide evaluations in apple and pear orchards in Israel during 1978–1980 indicate the efficacy of sterol-inhibiting fungicides for control of scab and powdery mildew. These fungicides differed in their effective dosage rates and range of disease control. CGA 64251 and fenapanil were effective for the control of apple powdery mildew and apple and pear scab. Bitertanol was effective for the control of apple and pear scab and gave some control of apple powdery mildew. Triadimefon was excellent for the control of apple powdery mildew, being more effective than diclobutrazol or fenarimol. Prochloraz was an effective fungicide against scab but less active against powdery mildew. A captan-triforine combination was effective in pear scab control.

Keyword(s): benomyl, benzimidazole fungicide resistance, carbendazim, Podosphaera leucotricha, Venturia inaequalis, Venturia pirina.