View Single Post
  #5   Report Post  
Old 03-07-2005, 12:46 AM
DigitalVinyl
 
Posts: n/a
Default

A little update.

When I spotted PM it was after two scorching weeks of heat and a dry
month. I was surprised that this weather INHIBITS pwdery mildew, makes
sense it is a MILDEW! And yet it was after that that I noticed it
growing.

Well the last week was humid warm and daily downpours late in the day.
The humidity should benefit the PM. Over 85 degrees inhibits it.

Last weekend I treated the grapes with a weak solution(2 gallons
water) of baking soda(1 1/2 tsp) and milk(skim, 1 cup). There are
other plants that would get drenched by this solution so I didn't want
to do anything extreme. You also can't just keep using the baking soda
cause it will affect the soil. I also hand cleaned the worst leaves.

Today I inspected them, then treated them again. This time 2 gallons
water, 1 1/2 cup skim milk, 2 tsp baking soda

I have to say the amount is noticeably less, but still there. I still
see it obviously on some grape clusters. I can't clean them only trash
them. I left them to measure progress on them. This week I made sure
to go under the leaf canopy and wet individual clusters with the
solution.

There's no way to know if this treatment really kills it or the hot
summer does.




DigitalVinyl wrote:

We've had some very hot humid weather in the northeast, and I've
developed some powdery mildew on a small section of the vine.

I can see the whitish hairy grpwth on a section of leaves. I'm
wondering if it too late to control it.

What has been most effective for home gardeners treating an existing
infection?? I see wettable sulphur mentioned being applied to acres,
but often the home gardeners has choices commercial growers can't use
(like picking bugs off rather than blanketing the area in pesticides)

Does cleaning the leaves off help control the infection?
I would imagine that the physical mildew impedes photosynthesis some,
which would reduce the health and vigor of that leaf/vine--helping the
mildew to survive.

Do you remove the diseased leaves? I'm guessing it is something that
can spread so less of it is a control.

I see some on grape clusters too. I'm planning to remove those--I have
plenty of other clusters.

I am concerned that some of the berries are almost 1/4" round, but
most are still smaller. There are warnings about using the wettable
sulphur, especially with table grapes--which these are.


DiGiTAL ViNYL (no email)
Zone 6b/7, Westchester Co, NY, 1 mile off L.I.Sound
3rd year gardener
http://pg.photos.yahoo.com/ph/royalf...=/2055&.src=ph


DiGiTAL ViNYL (no email)
Zone 6b/7, Westchester Co, NY, 1 mile off L.I.Sound
3rd year gardener
http://pg.photos.yahoo.com/ph/royalf...=/2055&.src=ph