Needle nutrient status of Sirococcus shoot blight-diseased and healthy Norway spruces
In this study the needle nutrient status of Sirococcus shoot blight-diseased and healthy Norway spruces (Picea abies) was investigated. Element contents were determined in the current year and 3-year-old needles collected in December 2000 from 72 mature trees randomly distributed in the investigated stand. Half of the trees were severely affected by Sirococcus conigenus and had a reduced crown whereas the other trees were unaffected and vigorous. Compared with the uninfected trees, contents of Mg, Ca, P and Mn were significantly lower in the current year and 3-year-old needles of diseased trees. Furthermore, analyses of the nutrient contents of needles from severely affected trees revealed insufficient Mg and Ca supply and enhanced N/Mg and N/Ca ratios, when compared with threshold values. The results of this study suggest that imbalanced tree nutrition either has a significant impact on the expression of Sirococcus disease symptoms or fungal infection itself is affecting needle nutrient contents.
Document Type: Research Article
Affiliations: 1: Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, Billrothstraße 53/1/4, A-1190 Vienna, Austria; ;, Email: firstname.lastname@example.org 2: Institute of Forest Ecology, University of Agricultural Sciences, Peter-Jordanstraße 82, A-1190 Vienna, Austria;
Publication date: February 1, 2003