The influence of fertilizers on the occurrence of Armillaria mellea in Scots pine plantations

The spread of Armillaria mellea inside fertilized (with NPKCaMg) and non-fertilized roots of pine was evaluated by: growth of mycelium on extracts from roots with bark, de-barked roots and from bark with bast, hygroscopic property, water saturation, weight loss and microscopical observations. Negative as well as positive influences of fertilizers were observed. The problems of the multi-aspect influence of fertilizers on the development of disease are discussed.