Rosa 'KORsteimm'

Summary

UC Davis is located in Davis, California, this site has a silty clay loam soil and plants are irrigated with potable water. More information about the field sites is located in the Nuts & Bolts section.

Lone Star is a yellow-flowered shrub rose that started its second year strong, but had foliar issues throughout the growing season. It tended to throw out long lateral canes from the rootstock that were very different than the rest of the plant, and in general had a habit of being non-uniform in shape and flowering. Some of the plants had issues with powdery mildew, and all were damaged by thrips and aphids. The foliage also became pale and sunburned in appearance by the end of August, causing the foliage ratings to drop below the acceptable level by September (Table 9). While this might be acceptable in regions with short summers, we would expect a rose in California to perform well into the fall. Another disappointing characteristic of this rose was the formation of brown hips in June, rather than self-cleaning for another flush of bloom. This habit often detracted from the overall appearance of the shrub. There were no significant differences in growth or quality between treatments, though marginally better quality was achieved on 40% of ETo.

Growth and Quality Data

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