Swiss Needle Cast
bengaia at ihug.co.nz
Sun Sep 10 14:15:37 EST 2000
of course the real solution is to avoid monocultures and plant a good mix of species.
truffler1635 at my-deja.com wrote:
> In article <39BB678D.C5D1281C at ihug.co.nz>,
> rewarewa at ihug.co.nz wrote:
> > truffler1635 at my-deja.com wrote:
> > > From The Oregonian, Sept. 8, 2000, p D4
> > >
> > > RESEARCHERS SAY FUNGUS AFFLICTING DOUGLAS FIRS MAY HAVE PEAKED
> > >
> > > The epidemic hit along the northwest Oregon coast, causing many valuable
> > > trees to lose their needles
> > >
> > > By MATT SABO
> > > CORRESPONDENT, THE OREGONIAN
> > >
> > >
> > > Comment by poster: While the article says most of the outbreak is located
> > > along the coast, there is a considerable amount present in the Cascade
> > > Range as well. The Cascade foothills of Clackamas county are well-
> > > involved, and have been for some time. Once again, it is time to assess
> > > the "traditional" re-planting regimen of only Douglas fir after logging.
> > > Plantation rotations are ripe for SNC. Interplantings of other tree
> > > species, including White pine, Whitepark pine, Western hemlock, Red alder
> > > and oak would strongly decrease SNC by spacing out potential host trees
> > > farther apart, and interrupting dispersal of spores. Several studies have
> > > also shown that Red alder mixed with Douglas fir tend to grow both trees
> > > more rapidly than a single-species planting of either species.
> > We've had this disease in New Zealand. We found that pure stands of D fir were
> > improved by regular, light thinnings. The species is reasonably shade tolerant
> > and has a high Mean Annual Increment from about age thirty (here). This had lead
> > us to keep the stands at high stockings, which seem to trigger the disease.
> > Keeping deep crowns seems to work for us.
> > JC
> Thanks for sharing. Your method to control SNC seems logical to me. But
> I'm glad to hear that thinning does work in controlling SNC somewhere.
> Daniel B. Wheeler
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> Before you buy.
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