Adult plant resistance to stripe rust (Puccinia striiformis) in some New Zealand wheat cultivars

Abstract The resistance to stripe rust on each mainstem leaf of seven New Zealand wheat cultivars was assessed in three autumn-sown field trials which were exposed to natural inoculum in 1987, 1988, and 1989. Stripe rust was assessed weekly and disease progress curves, maximum severities, and areas under disease progress curves each showed that all cultivars lacked seedling resistance, but four possessed adult plant resistance. Adult plant resistance developed progressively, usually on Leaves 3, 4, and 5, and developed later in ‘Weka’ than in ‘Otane’, ‘Kotare’, and ‘Ruapuna’. Cultivars also differed in degree of adult plant resistance. Glasshouse experiments showed that although there were significant differences among cultivars in uredinium density and latent period on seedling leaves, the differences were small compared to those on flag leaves. Latent period on flag leaves varied from 12.2 to 16.5 days, infection type from 5 to 8, uredinium density from 0.6 to 3.5/mm2, and uredinium length from 249 to 5...

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