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Tomato Blight

• Message 1. 

  Posted by WorldL (U14753774) on Friday, 14th January 2011

  Just watched The Edible Garden with Alys Fowler and she was having trouble with tomato blight. How about spraying the plants with 3% hydrogen peroxide to kill the fungus and also feed the plants with extra oxygen at the same time? Anyone else tried it?

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• Message 2

  , in reply to message 1.

  Posted by Swedboy (U14400604) on Friday, 14th January 2011

  I suspect you would kill the plant by making the environment too acidic or even burn the the plant.
  
  Is this a known method?

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• Message 3

  , in reply to message 1.

  Posted by bogus the fungi man (U14705597) on Saturday, 15th January 2011

  I've carried out experiments on seedlings that were suffering from bacterial attack using peroxyacetic acid (similar to H2O2) with little success. I suspect H2O2 would work and not damage the plants as it reacts quickly turning into water and oxygen. You would need to have 100% coverage to acheive this. The only problem I can see is it is not residual so any spores that land on the plants there after will reinfect.
  
  I now use the Hotbox Sulfume with 100% success.
  
  

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• Message 4

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  Posted by As_Iff (U13951957) on Saturday, 15th January 2011

  Plants don`t use oxygen though to make food. They use carbon dioxide and chlorophyll . They give off oxygen as a by-product. That is why they are so essential to us.

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• Message 5

  , in reply to message 1.

  Posted by shalsi (U8068357) on Saturday, 15th January 2011

  For the last two years I have sprayed my outdoor tomatoes with bordeaux mixture and have not had any blight, but this may just be coincidence

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• Message 6

  , in reply to message 5.

  Posted by bogus the fungi man (U14705597) on Saturday, 15th January 2011

  No, I don't think it is a coincidence. Bordeaux Mixture is a good cure all fungicide. As with suphur. They've both been around for years. I use Bordeaux on my potatoes too with good results.

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• Message 7

  , in reply to message 3.

  Posted by Swedboy (U14400604) on Saturday, 15th January 2011

  Ok. As an organic chemist it just sound a bit weird.

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• Message 8

  , in reply to message 6.

  Posted by farmerSteve (U2644680) on Sunday, 16th January 2011

  just to correct a misimpression
  Bordeaux mixture is not a curing fungicide it is preventive so it is too late once it has got hold
  It must be used on a regular basis if you suspect a blight period is going to occur (warm damp weather)
  Bordeaux mixture is set to be banned very shortly anyway due to the damge it may do to the environment

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• Message 9

  , in reply to message 8.

  Posted by bogus the fungi man (U14705597) on Sunday, 16th January 2011

  You're right, farmer Steve, I missed that bit out about preventative not curative. Application depends on weather, as I found out. If it rains after you've applied it, chances are you’ll have to do it all again. But, if I remember right, there's a limit to the number of applications per crop too.
  
  As you probably know, most things used by the amateur will be revoked soon probably because the amateur has no formal training and may "underdose and overdose" or generally ignoring the legal label recommendations causing environmental problems. The professional will still be able to use copper based fungicides like copper ammonium carbonate and copper oxychloride till their review in 2013. It's a shame but the cost of getting products passed also makes it less likely they will be available to the amateur. The market's just too small for the effort and return. We'll have to make do with organic, predator, elbow grease and (shouldn't say this) home made remedies soon.
  

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• Message 10

  , in reply to message 9.

  Posted by gardenyour (U14753767) on Sunday, 16th January 2011

  guess most of us in UK will have stop growing tomatoes do to fact big bother will not let us spray to prevent blight and without spraying hurt commercial agriculture

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• Message 11

  , in reply to message 10.

  Posted by Italophile (U12516505) on Monday, 17th January 2011

  I rely mainly on housekeeping. Sufficient distance between plants for air circulation; judicious nipping out of foliage for air circulation; and keeping a minimum of 18" between the lowest foliage and the ground to guard against spores splashing back onto the foliage when watering.

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