Blackspot/Powdery mildew treatment -Reply

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• To: r*@eskimo.com
• Subject: Blackspot/Powdery mildew treatment -Reply
• From: S* S* <S*@Schwabe.com>
• Date: Wed, 27 May 1998 12:05:10 -0800
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• Resent-Date: Wed, 27 May 1998 12:02:09 -0700
• Resent-From: rose-list@eskimo.com
• Resent-Message-ID: <"oQg243.0.yP6.mC6Rr"@mx1>
• Resent-Sender: rose-list-request@eskimo.com

It helps me a lot.  Since I really don't have the
time to keep all that up, I think I'll stick to the
disease resistant ones!  Great information,
thanks.  No point in trying to cure Zeph now. 
I'll just pull the leaves off and she'll be naked
for awhile.  And you're right -- no wonder it
gets discouraging!  Another vote for old
roses/own root (most of them, anyway!)

>>> "Dave Amorde"
<dave_amorde@msn.com> 05/27/98 10:22am
>>>
Several questions have come up regarding the
treatment of these diseases.
  Both of these fungi must grow for several days
to several weeks before
becoming visible - by the time you can see the
damage, it is already to
late! A spraying program, to be truly effective,
should be started before
any evidence of the problem is visible. Even
then, it is possible that the
disease has already established itself on the
leaves, but is not yet
visible - such leaves may still succumb to the
disease. This is one reason
why many people become frustrated with
spraying.
 Once the leaves have been damaged by either
organism, it is impossible to
reverse the damage - blackspot/powdery mildew
cannot be "cured" in the sense
that existing damage can be repaired. Most of
the fungicides on the market
do not even kill existing fungi, the merely
prevent new spores from
establishing themselves when the germinate.
This is another source of
frustration for beginners. However, once a good
spraying program is begun,
new growth should be disease free. Because of
the reasons mentioned above,
it often takes several weeks for the results of a
good spraying program to
become evident - be patient.
 Many sprays are labeled as "systemic." This
means that the active
ingredients are absorbed by the plant tissues,
and remain effective over
some period of time. The good news is that this
means you don't have to
reapply the spray when it rains. The bad news
is that although the material
is absorbed, it does not travel throughout the
plant's "bloodstream."
Whenever you spray, you MUST cover the
entire plant's surface for the
treatment to be effective - top & bottom of all
leaves, all stems, etc.

Hope this helps,

Dave Amorde
dave_amorde@msn.com

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