fungicides
updated mon 9 feb 04
Amy Fernandez on mon 9 feb 04
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I believe this would be true of anything that changed the surface PH of =
the leaf. Milk will
acidify as it decomposes. Sulfur also acidifies. But you can go the =
other way too and make it
too sweet for powdery mildew by spraying bicarbonate of soda.
I bet that if you could find the correct dilution, you could spray =
liquid fertilizer for acid
loving plants. Then you could feed the leaves and prevent powdery =
mildew simultaneously.
It is changing the narrow PH range that powdery mildew lives in that can =
stop it.
There is also AQ10 ( http://www.pmac.net/aq.htm )which is a naturally =
occurring organism that
EATS powdery mildew, and will hang around for the season, just waiting =
for another food feast
when PM returns.
Later,
Tom
Joe Hecksel wrote:
as
year.
> "Most of them did not provide good control," he says, "but milk and =
whey
see
> more data," says Wilcox. He recently visited an Australian vineyard =
that
> was experimenting with milk treatment. "There was a level of disease
> that
> some growers would not find acceptable," he warns.
> Reducing sulphur treatment is important to organic wine-makers. =
"Having
> an
> organic farm spraying sulphur seems a bit odd," says Will Davenport,
> director of UK organic-wine producer Davenport Vineyards. Standard
> fungicides can harm the insects and soil bacteria that keep other =
pests
> down.
> However, vegans could not drink milk-treated wine. So Davenport makes
> 'compost tea' to control the powdery mildew on his farm. This liquid
> compost is full of soil bacteria, but contains no fungal spores. =
Sprayed
http://lists.ibiblio.org/pipermail/nafex/2002-September/001223.html
------=_NextPart_000_009B_01C3EF44.96679050
I believe this would be true of anything that =
changed the
surface PH of the leaf. Milk will
acidify as it =
decomposes.
Sulfur also acidifies. But you can go the other way too and make =
it
too
sweet for powdery mildew by spraying bicarbonate of soda.
I bet =
that if
you could find the correct dilution, you could spray liquid fertilizer =
for
acid
loving plants. Then you could feed the leaves and prevent =
powdery
mildew simultaneously.
It is changing the narrow PH range that =
powdery
mildew lives in that can stop it.
There is also AQ10 ( href=3D"http://www.pmac.net/aq.htm">http://www.pmac.net/aq.htm =
)which is a
naturally occurring organism that
EATS powdery mildew, and will hang =
around
for the season, just waiting for another food feast
when PM
returns.
Later,
Tom
Joe Hecksel wrote:
> =
Forwarded
from Viticulture list.
>
> Milk makes wine =
fine: Dairy
sprays protect grapevines from powdery
> =
mildew.
> 18
September 2002
> CHARLOTTE WESTNEY
> href=3D"http://www.nature.com/nsu/020916/020916-5.html">http://www.nature=
..com/nsu/020916/020916-5.html
>
Milk could be used to make organic wine. Sprayed on grapevines once
a
> fortnight, milky water seems to control powdery mildew =
as
effectively as
> sulphur and copper fungicides, without =
tainting
the grapes' taste.
>
> Peter Crisp of the =
University
of Adelaide in Australia made the
> =
discovery
> during
his survey of traditional treatments for the fungus, =
which
>
currently
> costs the Australian wine industry A$30 million =
(US$16
million) a year.
>
> "Most of them did not =
provide
good control," he says, "but milk and whey
> stood
out."
>
> The fungus can engulf whole grapes,
rendering them unfit for
> wine-making.
> =
Sulphur
sprays stop powdery mildew growing by interfering with =
its
>
enzymes.
> How milk works is not clear, but full-fat seems =
to work
best.
>
> Milk fat or whey protein may feed
microorganisms on the vine surface
> that
> =
then
compete for space or even consume the mildew spores, says =
Wayne
>
Wilcox, a plant pathologist at Cornell University, New
York.
>
> "There is definitely something in =
the
treatment, but I would like to see
> more data," says =
Wilcox. He
recently visited an Australian vineyard that
> was =
experimenting
with milk treatment. "There was a level of disease
>
that
> some growers would not find acceptable," he
warns.
>
> Reducing sulphur treatment is =
important to
organic wine-makers. "Having
> an
> organic =
farm
spraying sulphur seems a bit odd," says Will Davenport,
> =
director
of UK organic-wine producer Davenport Vineyards. Standard
> =
fungicides can harm the insects and soil bacteria that keep other
pests
> down.
>
> However, vegans =
could
not drink milk-treated wine. So Davenport makes
> 'compost =
tea' to
control the powdery mildew on his farm. This liquid
> =
compost is
full of soil bacteria, but contains no fungal spores. =
Sprayed
>
on
> a vine, the bacteria cover the plant's leaves, =
competing with,
and
> eating,
> the fungal
spores.
>
> =A9 Nature News Service / =
Macmillan
Magazines Ltd 2002 href=3D"http://lists.ibiblio.org/pipermail/nafex/2002-September/001223.ht=
ml">http://lists.ibiblio.org/pipermail/nafex/2002-September/001223.htmlA>
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