Abstract

Heterobasidion annosum (Fr.) Bref. s. 1. colonization following thinning was studied in 1246 stumps of Picea abies (L.) Karst. trees from 14 previously unthinned stands in Sweden. Treatments included mechanized and manual application of (1) 35% urea solution, (2) Phlebiopsis gigantea (Fr.) Jul. spores, and (3) 5% solution of disodium octaborate tetrahydrate (DOT), and untreated stumps, cut in the summer and winter. Compared with untreated stumps cut in the summer, all stump treatments and winter cuttings significantly reduced the colonized stump area 6-7 weeks after thinning by 88-99%. Mechanized stump treatment provided as good protection as manual treatment against H. annosum infections. The probability of spore infection (p(ij)) was reduced by 53-83% in mechanized treatment and 79-98% in manual treatment compared with untreated summer thinning. In terms of p(ij), urea had significantly higher control efficacy than P. gigantea and manual treatment performed better than mechanized treatment

Keywords

Biological control; chemical control; disodium octaborate tetrahydrate; Norway spruce; Phlebiopsis gigantea; stump infection; thinning; urea

Published in

Scandinavian Journal of Forest Research
2005, Volume: 20, number: 2, pages: 154-164
Publisher: TAYLOR & FRANCIS AS

SLU Authors

• Stenlid, Jan

  • Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science
Environmental Sciences related to Agriculture and Land-use


Publication identifier

DOI: https://doi.org/10.1080/02827580510008338

Permanent link to this page (URI)

https://res.slu.se/id/publ/6200