Fertilisation as a control measure to Sirococcus shoot blight in secondary Norway spruce stands : Forest Ecosystem Restoration. Ecological and Economical Impacts of Restoration Processes in Secondary Coniferous Forests

2000

S. 29-34

5 Tab, 14 Lit. Ang.

Unselbständiges Werk

200072765

In this study the impact of fertilisation upon severity of Sirococcus shoot blight was evaluated at four sites at the research areas Kobernaußerwald and Sauwald. Investigations were carried out in uniform, even aged mature Norway spruce stands severely affected with Sirococcus conigenus. Four years after fertilisation severity of shoot dieback was different between sites and treatments. The use of magnesite derived ferilisers in combination with an organic slow release fertiliser ("Biomag M7" + "Primafert") or amended with organic compounds respectively ("Biomag M3B") decreased severity of Sirococcus shoot blight at all four sites. Except one site at the Kobernaußerwald area, a single application of an organic feriliser ("Primafert") did not achieve similar effects. These results and the data obtained from needle analyses indicated that Sirococcus shoot blight is closely related to disturbances in tree nutrition, especially lack of magnesium and calcium corresponding with too high N/Mg and N/Ca ratios. Application of the magnesite derived fertilisers (Biomag treatments) harmonised tree nutrition and may mitigate the severity of Sirococcus shoot blight.