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Re: Blackspot/Powdery mildew treatment

Everyting that is stated below by my friend is standard knowledge - but
there are folks on GARDENWEB who state that spraying with MIRACID caused a
reversal of Black Spot damage.  I presume that this means that the black
spots went away and were replaced by healthy leaf tissue.

As someone trained in Science, I find it frustrating to see people say "That
cannot work, hence I will not try it"  The attitude that I have been trained
to have is "That does not sound like it will work, but the downside is not
great, it is not hard to do, so I will give it a shot."

Along these lines, I have been supplementing my spray program of alternating
Funginex and Daconil with a Miracid spray.



>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
>
>
>
>
Richard Langer
Science Teacher
Gateway High School
ST.LOUIS MO 63110
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