Articles
ROOT ROT FUNGI ON APRICOT IN HUNGARY
Samples originated from dead trees, from dying trees and also from seemingly healthy ones.
Root remains were collected also from soils which had been earlier used for apricot growing.
Fungi isolated from the roots were used for the infection of apricot seedlings in Krasilnikov-pots.
The taxon living in Hungary of the species Armillariella mellea s.l. (Basidiomycetes, Agaricales) grows only on dead wood, mainly in forests, sometimes in orchards.
It could not been identified as the agent of infection, since it did not infect seedlings in pots.
Rosellinia necatrix (Hart.) Berl. (Ascomycetes, Sphaeriales (occurs in all the apricot growing areas in Hungary.
It may cause death of apricot trees planted after vine or tree fruit.
Roesleria hypogaea Thüm. et Pass. (Ascomycetes, Helotiales) is relatively rare, it was found only in a few nurseries, and in orchards planted with maiden trees originating from these infected nurseries.
The infection of the trees results in defective rooting of the young trees: established trees show poor growth and many of them die untimely.
Investigations of the roots on scanning electron microscope showed that on infected fibrous roots, root hairs had not developed or had died untimely, but a great number of root hairs developed on healthy fibrous roots.