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Rust severity in bioenergy willow plantations treated with additional nutrients

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A 3-year field study was carried out to determine the effect of wastewater irrigation and previous differences in mineral fertilization on the occurrence of willow leaf rust (Melampsora epitea). The experiment was conducted in two energy forest plantations: one designed for wastewater purification and the other as a mineral fertilization experiment. The severity of leaf rust on different clones and sites with different treatments was assessed by counting the number of uredinia per leaf unit area. Generally, plants irrigated with wastewater consistently had more leaf rust, irrespective of the study years or willow clones. Previous mineral fertilization had mixed effects on different clones 2 years after the last application. Three years after the last fertilizer application, however, no impact of the treatment on rust disease development was detected. In general, the rust levels differed from year to year probably due to climate. In this study, no correlation was detected between shoot age and rust severity, whereas climate and treatments strongly influenced leaf rust levels on some willow clones.

Document Type: Research Article


Affiliations: 1: Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1a, 51014 Tartu, Estonia 2: Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden

Publication date: February 1, 2009

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