Results of a thinning study in a black stain (Leptographium wageneri)‐infested Jeffrey/ponderosa pine forest in northern California

Black stain root disease (BSRD) caused by Leptographium wageneri var. ponderosum (Verticicladiella wageneri) is a destructive disease in many Jeffrey pine (Pinus jeffreyi) and ponderosa pine (P. ponderosa) forests of the western United States. Overcrowding is a pervasive problem in these forests, un...

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Bibliographic Details
Published in:Forest pathology = Journal de pathologie forestière = Zeitschrift für Forstpathologie 2019-10, Vol.49 (5), p.n/a
Main Authors: Woodruff, William, Greenberg, David, Cannon, Philip, Roux, Jolanda
Format: Article
Language:English
Subjects:
Black stain
black stain root disease
Coniferous forests
Forests
Incidence
Jeffrey and ponderosa pine
Mortality
Overcrowding
Pine
Pine trees
Pinus jeffreyi
Pinus ponderosa
Thinning
thinning impact
Verticicladiella wageneri
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Summary:Black stain root disease (BSRD) caused by Leptographium wageneri var. ponderosum (Verticicladiella wageneri) is a destructive disease in many Jeffrey pine (Pinus jeffreyi) and ponderosa pine (P. ponderosa) forests of the western United States. Overcrowding is a pervasive problem in these forests, unless alleviated by thinning. In an overcrowded BSRD‐infested second‐growth Jeffrey/ponderosa pine forest in northern California, a large study (16.2 hr; 40 acres) was designed to determine the impact of thinning to four levels—6.9 m2/ha (30 ft2/acre), 13.8 m2/ha (60 ft2/acre), and 20.7 m2/ha (90 ft2/acre) of basal area and a control with no thinning—on the incidence of BSRD‐caused mortality. Ten years after this experiment was initiated, results indicate that thinning to any of these levels lowered the incidence of BSRD‐caused mortality as compared with BSRD‐caused mortality in unthinned control plots.
ISSN:1437-4781
1439-0329
DOI:10.1111/efp.12551