Abstract

Pine stumps are not being treated against Heterobasidion spp. in Sweden. To determine whether they should be, the frequency of stump infections and the species of Heterobasidion involved were investigated in nine newly thinned pure Scots pine (Pinus sylvestris L.) stands in southern Sweden. The incidence of Heterobasidion was measured in roots of standing Scots pine in another 15 stands. Infections by both H. annosum (Fr.) Bref. s.s. and H. parviporum Niemela & Korhonen were numerous in stumps six months after a summer thinning. The pathogen, mostly H. annosum, was found in 44 of 60 sampled root systems, from 14 of the 15 stands. Twenty of the infected pines were assessed as healthy on the basis of crown symptoms while 24 trees had defoliated crowns. Infected root systems were most frequent among trees with thin crowns in stands on former agricultural land, where previous thinnings had been carried out during the growing season when airborne spores are plentiful. The study suggests that stump treatment may be a profitable way to reduce disease development in Scots pine monocultures on sandy soils as well as in mixtures with Norway spruce [ Picea abies ( L.) Karst.] on any soil

Published in

Scandinavian Journal of Forest Research
2006, Volume: 21, number: 5, pages: 405-413
Publisher: TAYLOR & FRANCIS AS

SLU Authors

• Rönnberg, Jonas

  • Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science


Publication identifier

DOI: https://doi.org/10.1080/02827580600917379

Permanent link to this page (URI)

https://res.slu.se/id/publ/10789