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Attempts to naturally regenerate red pine can be threatened by Diplodia shoot blight damage to understory seedlings
Ist Teil von
Phytopathology, 2009-06, Vol.99 (6), p.S95-S95
Erscheinungsjahr
2009
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Changes in red pine (Pinus resinosd) management, due to aesthetic and biodiversity concerns, include creation of harvest units with irregular edges, long borders of mature trees, and retention of some overstory trees within a harvested area. Also, in contrast to traditional even-aged management in which trees of one age class are grown, clearcut at final harvest, and replaced by planted seedlings, there is increasing interest in natural regeneration and developing multi-aged red pine stands. However, crowns of red pines can be sources of abundant inoculum of the shoot blight pathogen Diplodia pinea. To determine if Diplodia shoot blight threatens young, naturally regenerated red pine in the understory, six replicate plots were established in each of four mature plantations in central Wisconsin. The frequency of standing, dead seedlings bearing shoot blight symptoms or signs of the pathogen, and the incidence and severity of shoot blight damage to live seedlings were recorded. Mean seedling mortality ranged from 13-30% and mean incidence of blighted living seedlings ranged from 94-100% at all sites. The mean frequency of live seedlings with their terminal leaders killed in the past was from 55-94%. Mean severity of damage to live seedlings, on a 0-3 scale, was .2.16 at all sites. Results of a PCR assay confirmed pathogen identity. These results support previous research and concern that shoot blight pathogens threaten young red pines in the understory.