What is wrong with our rhododendron?

davekate davekate at open.org
Sun Mar 26 00:38:10 EST 2000


I just removed one that looked wilted. All the leaves hanging down and the
veins prominent, or the interveins sunken. Symptoms like it had root rot....
It was planted too deeply. Rhodies are pretty sensitive to deep planting. Is
this your problem?
Toni Allardyce <ccrhorse at netcom.ca> wrote in message
news:m4ZC4.16789$Xk2.67112 at tor-nn1.netcom.ca...
> I agree with the writer indicating a pathogen, specifically a vascular
> disease. Verticillium , fusarium, phytophlora, all are similar in that
they
> indicate wilt, as seen in your photos. I notice the discoloring starts at
> the base of the leaves near the stem indicating some type of vascular
wilt.
> Also, are your plant in a container? This would also lead to a problem
with
> drainage. I do not agree with the next writer , who thought it was a
freeze.
> I am in the area of Vancouver, BC and experience many cold periods with
> below zero temps. My rhodos appear wilted for a time, to protect the
leaves
> from the cold and reduced xylem activity decreases water flow to the
leaves.
> Also check the Compendium of Rhododendron and Azalea Diseases, edited by
> D.L. Coyier and M.K. Roane.
> Leslie Kaplan <rushcreek at prodigy.net> wrote in message
> news:8ahi61$36ja$1 at newssvr03-int.news.prodigy.com...
> >
> > I do not see any evidence of black vine weevil damage (notched leaves),
> bugs
> > which cause serious root damage in the larval stage.  I would say that
> your
> > rhodies are suffering from a fungus disease, eg. phytopera (sp?).  In
> heavy
> > soils, like the clay ones around here, the roots tend to deteriorate for
> > lack of good drainage, and often these fungus diseases develop.  They
> futher
> > destroy the roots, and you see blackened stems and dead and drooping
> leaves
> > like the ones in you picture, one branch at a time, usually starting
from
> > the bottom, but sometimes affecting one side of the plant first.  No
cure.
> > Unfortunately, phytopthera does tend to linger in the soil, and it is
> > recommended not to replant rhodies in the same spots.
> >
> >  Amending the soil with organic material (preferably acidic) and ground
> pine
> > bark, sometimes sold as 'Soil Conditioner' will help new plantings
> survive.
> > As far as light, they prefer eastern exposures, but are quite adaptable.
> Do
> > you ever fertilize?  If you do, use a light application formulated
> > specifically for acid-loving plants.  Good luck.  I would remove the
sick
> > plant and hope for the best with the other.  Drought can be another
stress
> > factor.
> >
> > blah <blah at bleh.com> wrote in message
> > news:38cc320b.12853429 at news.mindspring.com...
> > >
> > > Pictures of our sick plant at:
> > >
> > > http://www.mindspring.com/~alanwolf/diagnose/diagnose.htm
> > >
> > > Local plant people mumble about fungus or rot or bugs, or...
> > > In other words, they have no idea.
> > > These are expensive, and we've lost a couple to the same
> > > symptoms.
> > > Any ideas?
> > >
> > > They don't get too much light in our courtyard...
> > >
> > > Thanks.
> > >
> > > Alan Wolf
> > > alanwolf at mindspring.com
> > >
> > >
> >
> >
>
>






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