| Pak. J. Bot., 34(1): 55-57, 2002 | Back to Contents | ||||
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Updated: 24-05-12 | ||||
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Evaluation of apple cultivars to powdery
mildew M. Afzal Akhtar, Ehsan-ul-Haque and M. Akram Nasir Abstract: Apple powdery mildew caused by the fungus Podosphaera leucotricha is widely spread both in fruiting orchards and in tree nurseries in Pakistan. The disease is serious in orchards grown at Murree. Powdery mildew can affect trees directly by killing fruiting spurs and causing russet on fruits. Twenty-six apple cultivars from USA (6), UK (5), Germany (7), Lebanon (6), Korea (1) and Pakistan (1) were evaluated for their reaction to powdery mildew disease according to 0-5 scales at Hill Fruit Research Station, Sunny Bank, Murree during 2001. Out of 6 USA cultivars 3 showed range of mean disease severity 0.3-1.5, out of 5 cultivars from UK 3 showed 1.2-1.4, out of 7 cultivars from Germany 5 showed 0.5-1.3, out of 6 cultivars from Lebanon 5 showed 0.4-1.3 and one cultivars from Korea showed 1.4 mean disease severity indicating cultivar resistance. |
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