GEOGRAPHICAL-DISTRIBUTION OF THE ARMILLARIA SPECIES IN THE NETHERLANDS IN RELATION TO SOIL TYPE AND HOSTS

The geographical distribution of the annulate Armillaria species was s tudied in The Netherlands during the period 1983-1992. Armillaria gall ica (incl. A. cepistipes), A. mellea and A. ostoyae appear to be wides pread, the first two species being rather common on broad-leaved hosts growing on clay and loess soils, and the third species common on both broad-leaved and coniferous hosts on acid sandy soils. The distributi on of the Armillaria species encountered was primarily determined by s oil type From a silvicultural point of view, A. ostoyae is the most im portant species, being pathogenic and occuring most frequently on sand y soils, the soil type predominantly used for forestry in The Netherla nds.