S.O.S. for magnolia

David Deutsch dd at gondwana.org
Mon Sep 20 09:41:17 EST 1999


Hi Mike!

Andrea Giordano (<giordano at inrete.it)
posted a general message seeking
help regarding a mature magnolia tree
that was suffering from a non-descript,
seemingly fungal condition.

I responded as follows (note the
emphasis I add):

> > I have a suggestion which might
help... might ...!
            ^^^^^^^

> >
> > There is a product called Phyton 27
> >  that appears to have some effect
> > against Verticillium Wilt
                      ^^^^^^^^^^^^^^^^
> > Another product, called Clearys
> > 3336, might have SOME effect, esp.
> > if  fusarium's the culprit.
       ^^^^^^^^^^^^^^
       ^^

I added in that post that without specific
information regarding symptoms and
perhaps location and environment, its
difficult to say what the problem is and
that is why I emphasize my use of the
work "might."

You, "Mike the Tree Doctor" <
mlamana at bestweb.net> responded:

> David:
> I've worked w/Phyton 27 (copper sulphate) and Cleary's 3336f (thiophanante
> methyl)...what makes you think that these materials might have an effect
> against an extant infection in xylem? have you read anything to tat effect?
> I'd very interested!

Phyton 27 is approved for use in
Verticillium Wilt of Japanese Maples. I
have found it to be exceptionally effective
for that purpose on all Maples, and a
close acquaintance has used the
product on Magnolias with Verticillium
Wilt (as a soil drench) with surprising
results. But again, I must be cautious,
and hence yet another reason to use to
work "might."

By the way, you should contact the
Phyton-27 manufacturer, as they inform
me that  Phyton-27 is not just "copper
sulphate" but is in some proprietary
chemical suspension or buffer that
purports to avoid the perils of ordinary
copper sulphate (provided it is not
mixed with other chemicals that
eliminate that buffer and undo the
protection (Alliette is reputed to be a
particular threat in thgis regard, and
should be delayed by at least 10 days
either side of Phyton application).

You may wish to read the label
regarding my comments, if you feel my
statements are inaccurate.



As for Clearys, my understanding is that
is is a fairly benign chemical (I'm open
to corrections on this) compared to
other stuff, like, say, Metalaxyl, and it has
proven remarkably effective against
Fusarium, and indeed it completely
pulled hebes in a friend's garden out of
a Fusarium induced dive. I like this
product a great deal and am happy to
recommend it for Fusarium, and indeed
for everything the label indicates it is
useful for.

Unfortunately,  Phyton doesn't help with
Fusarium and Clearys doesn't help with
Verticillium.

So, in conclusion, to the extent Andrea's
tree's disease(s) *might* be verticillium
or fusarium (both of which could be the
culprit, although the latter is less likely in
a mature tree), and to the extent that the
above products *might* help, I therefore
recommended them. Lacking absolute
certainty, I was careful to make it clear
that these were ideas . . . not
guarantees.

Lastly, since the above diseases affect,
for the most part, the xylem as well as
portions of the cambium layer, I feel
justified to arrive at the following
syllogism:

If these products mentioned above are
effective (per the label) in the treatment
of the diseases mentioned above, and if
these diseases affect  the xylem tissue,
then likewise it follows that these
products also affect/reach xylem.

QED.


Kind regards,

David Deutsch
Gondwana Gardens
http://www.gondwana.org
[Our annual specimen-sized
rare plant sale starts Sept.
20 --- check our website for
details.]


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