Incidence of Decay Fungi in Stumps of Two Thinned Western Larch Stands in Northeastern Oregon

摘要

Incidence of decay fang was measured in sumps from two thinned western larch (Linfox occidentals Nutt.) stands (9 and 15 years after thinning), one precommercially thinned and one commercially thinned in northeastern Oregon. Ten species of decay fungi were poscivaiy identified form 180 stumps. Two root pathogenic species Heterobasidion animus (Fr.) Brief and Armillary obscure (Pers.) Herink Roll-Hansen, were found at relatively low frequencies. Most of the decay in the stumps was caused by either Fomitopsis pinicola (Swartz ex Fr.) Karts or Trish atom abietinum (Dicks. Ex Fr.) Rye which normally are saprophytic wood decomposes.