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9 messages
17/11/2012 at 11:15

Hi All,

Has anybody any solutions as to how to control/prevent mildew on my grapevine. This year the crop was ruined because mildew attacked bothe the leaves and the grapes themselves. I tried various available chemicals but nothing worked.

Many Thanks

Ian

17/11/2012 at 12:01

Hi, I had the problem in my GH  real bad this year I believe it was due to the lack of sunshine and warmth. Inadequate ventilation can be a probable cause. Hope 2013 is better!

17/11/2012 at 12:02

2013 has to be better. PLEASE

18/11/2012 at 08:42
tropicalboy wrote (see)

Hi All,

Has anybody any solutions as to how to control/prevent mildew on my grapevine. This year the crop was ruined because mildew attacked bothe the leaves and the grapes themselves. I tried various available chemicals but nothing worked.

Many Thanks

Ian

Which mildew did you have? Powdery or Downy?

19/11/2012 at 19:34

I'm pretty sure it's powdery mildew, although it's difficult to be absolutely sure. Looking at images on Google they both look like the same as that which my grapes vine suffered from.

As you say, lack of warmth could be a factor as well as the weather being wet in the spring. I'm not sure what chemical control I can use, if any. Any ideas?

20/11/2012 at 15:47
Give mildewed plants the Cleopatra treatment. A diluted spray of milk ( 10% but not more than 30%) to leaves is a brilliant protection but a much less effective remedy. Remove the most diseased leaves (and burn them) but not more than 30% of entire plant's foliage or it will weaken it too much. Spray both sides of the leaves and then feed the roots with a seaweed elixir.

The milk dilution works for grapes, roses, raspberries and dahlias. No one certain why it inhibits the mildew growth but beware the milk promotes a different mould if the concentration is above 30% dilution. It may be a protein or it may be the bacteria in the milk that works.HTH
20/11/2012 at 17:16

Many thanks for the tip. One thing, would it be helpful to spray before there is any sign of Mildew or at the 1st signs?

20/11/2012 at 22:49
It inhibits the mildew so use as a preventative or at the earliest signs of mildew tropicalboy.

Feeding with seaweed extract helps the grape resist the mildew just as much as the milk does. My two vines take off for the next county when they get their chicken pellet feed in early March but when they get their seaweed solution in middle of May the leaves lush up.

PS Use the young leaves blanched and steamed then marinaded in lemon and vinegar to wrap meat and rice - delicious!
21/11/2012 at 09:48

Many thanks for the advice. Much appreciated!!

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