[{"key":"dc.contributor.author","value":"Van Sickle, Gordon Allan","language":null},{"key":"dc.date.accessioned","value":"2012-03-28T22:53:23Z","language":null},{"key":"dc.date.available","value":"2012-03-28T22:53:23Z","language":null},{"key":"dc.date.issued","value":"1969","language":null},{"key":"dc.identifier.uri","value":"http:\/\/hdl.handle.net\/2429\/41855","language":null},{"key":"dc.description.abstract","value":"As management of forests and parks intensifies, pruning of\r\nconifers becomes more common. Thus understanding the role of wounds\r\nas possible entry courts for decay fungi is vital. In order to study\r\nsome aspects of this, three natural stands, one in New Brunswick and\r\ntwo in Nova Scotia, which had been pruned 4 to 7 years earlier by\r\nindustrial or displaced workers, were examined. Five pruned and two\r\nunpruned balsam fir (Abies balsamea (L.) Mill.) trees from each stand\r\nwere dissected; cultural isolations were taken from 207 knots where\r\npruning had caused little or no apparent damage to the bole, and from\r\n169 blazes resulting from less careful prunings. All 15 pruned trees,\r\nranging in age from 23 to 42 years, had decay attributable to pruning\r\nwhich averaged 1.7% of the stem volume. This incidence and volume of\r\ndecay exceeds that recorded in unpruned trees 40 to 60 years old in\r\nNew Brunswick.\r\nAxe blazes were the major entry court for decay-causing fungis\r\nbasidiomycetes were associated with 12% of the blazes and with 5% of the\r\nmore carefully pruned knots. Neither stem nor butt decay was found in the\r\nunpruned trees.\r\nIn a further study, 7 branches on each of 30 balsam fir trees\r\nnear Fredericton, N. B. were experimentally axe pruned; some carefully,\r\nsome carelessly; both during tree dormancy and during wet and dry periods of active growth. Thirty additional branches were saw pruned. At periods\r\nof 2 to 3 weeks, 5 to 7 months and 17 to 19 months after pruning, cultures\r\nwere made in the field from 70 of the pruning wounds. Within 2 weeks of\r\nthe latter period, the trees were dissected, measured and further cultures\r\nwere made in the laboratory from the same 70 wounds.\r\nEighteen months after pruning, 28 of 30 trees had decay averaging\r\n3.9% of stem volume and basidiomycetes were isolated from 22 (31%) of\r\n70 wounds. In the controls butt decay only occurred in 4 of 10 trees.\r\nThese studies show: (l) that blazes into sapwood (careless\r\npruning) were more frequently infected than those where little or no\r\nsapwood was exposed; (2) the incidence of infection was least in branches\r\npruned during the dry period and about equal for those pruned in the\r\nwet-active and dormant periods; and (3) the successional pattern\r\nbegan with imperfect fungi and bacteria, and terminated with decay fungi.","language":"en"},{"key":"dc.language.iso","value":"eng","language":"en"},{"key":"dc.publisher","value":"University of British Columbia","language":"en"},{"key":"dc.rights","value":"For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https:\/\/open.library.ubc.ca\/terms_of_use.","language":null},{"key":"dc.title","value":"Decay following pruning of Balsam fir in the Maritime Provinces of Canada","language":"en"},{"key":"dc.type","value":"Text","language":"en"},{"key":"dc.degree.name","value":"Master of Science - MSc","language":"en"},{"key":"dc.degree.discipline","value":"Forestry","language":"en"},{"key":"dc.degree.grantor","value":"University of British Columbia","language":"en"},{"key":"dc.type.text","value":"Thesis\/Dissertation","language":"en"},{"key":"dc.description.affiliation","value":"Forestry, Faculty of","language":null},{"key":"dc.degree.campus","value":"UBCV","language":"en"},{"key":"dc.description.scholarlevel","value":"Graduate","language":"en"}]