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Blight on tomatoes

• Message 1. 

  Posted by hereisabee (U2342191) on Friday, 6th August 2010

  To spray, or not to spray: that is the question:
  Wheher 'tis nobler in the mind to suffer
  The black/brown necrotic spots/blotches of outrageous fortune,
  Or use a chemical against a sea of troubles,
  And by opposing end them? To die: to sleep;
  No more; and by a sleep to say
  "They are not organic"
  The heart-ache and the thousand natural shocks
  That flesh is heir to, 'tis a consummation
  Devoutly to be wish'd. To die, to sleep;
  
  So who has got blight, who hasn't, who is worried , who is not?
  
  I am in Oxford with 30 plants outside in 10 varieties, they are stacked with fruit. Humidity going up to 80% but should fall next week. What should I do, play safe of chance it?

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• Message 2

  , in reply to message 1.

  Posted by glatz167 (U8027439) on Friday, 6th August 2010

  Hello.
  In answer to your question and not totally Knowlagable:
  If your tomatoes have got blight there is really nothing you can do about it.Diathane is yoused to prevent the spread but once engaged can only slow the deasise down mabey a small amount.
  My advise is to harvest what you have and despose of All else into your dust bin as blight can well over winter in a compost bin.
  Cheers
  Neil.
  P.S. Sorry about the spelling.

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• Message 3

  , in reply to message 2.

  Posted by hereisabee (U2342191) on Friday, 6th August 2010

  No, the tomatoes do not have blight, which is most active when 90% humidity is sustained for 24 hours. I am just trying to create a map for the infection?

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• Message 4

  , in reply to message 3.

  Posted by Barny (U13453961) on Friday, 6th August 2010

  I more or less agree with M2. Generally I'll have a crack at any pest or disease with any means at my disposal legal or illegal. However when that most evil of afflictions strikes then I throw in the towel. Bordeaux Mixture is effective and with I'm sure, harmless enough residues of parts /billion after washing,but I find blight actually affects the flavour of tomatoes so much so that I don't enjoy a blighted tomato.Similar story with potatoes.
  
  Do you really get much trouble with blight in the Oxford area?

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• Message 5

  , in reply to message 4.

  Posted by hereisabee (U2342191) on Saturday, 7th August 2010

  Yes last year as usual, it struck in late August on the allotments, however because of all the rain I had already sprayed with a copper fungicide - my plants escaped and produced a good crop of tasty fruit. I had signed up to blight warnings of which only one was received. The blight then hit other plotholder's crops about three weeks later in reasonable weather.
  
  So this year I am dithering, I suspect blight is inevitable so will hold back for the moment and then spray towards the end of the month.

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• Message 6

  , in reply to message 5.

  Posted by 4smilingcat6 (U14338727) on Saturday, 7th August 2010

  No blight here,Lincs/Cambs border but my outdoor toms, mostly Pricipe Borghese, are looking very good so I have sprayed with a copper based fungicide.
  
  

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• Message 7

  , in reply to message 6.

  Posted by Logissimo (U14020652) on Saturday, 7th August 2010

  If you want to protect your toms; Dithane or Bordeaux (copper sulphate) mixture are good options; they are not systemic so any residues can be removed by washing the fruit carefully. I believe that Bordeaux mixture is allowed by the organic movement, something I do not understand that well since copper does have its drawbacks too.
  
  Warmth and high humidity as you say are big risk factors for the development of blight (the same organism as potato blight).
  
  Hope it stays away from you whatever your decision!

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• Message 8

  , in reply to message 7.

  Posted by hereisabee (U2342191) on Saturday, 7th August 2010

  Thanks for replies, yes I am going down tomorrow to pick any ripening fruit. Then I shall spray one row of the ten varieties, the second will get some drift and the third will be organic. That way I shall be insured so to speak and it will be trial as to which varieties succumb?

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• Message 9

  , in reply to message 8.

  Posted by hereisabee (U2342191) on Sunday, 8th August 2010

  Fresher feel to the air today and getting onto the plot it was serene and wholesome. Hoverflies swarming round the french marigolds and bees finding nectar in the tomato flowers. So instead of spraying I spent time removing poor leaves tying-in and taking off sideshoots. I am now ready and able to spray if conditions dictate, however had a good look round the allotment in particularly a derelict plot where last years potatoes have self set, no blight visible.
  
  Here is the patch
  
  
  Sun Cherry is starting to crop
  
  
  Beef variety Country Taste doing well
  

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• Message 10

  , in reply to message 9.

  Posted by zoomer44 (U14019069) on Sunday, 8th August 2010

  So envious of your tomatoes.
  
  

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• Message 11

  , in reply to message 10.

  Posted by hereisabee (U2342191) on Monday, 9th August 2010

  Tomato Principe Borghese is an interesting variety 4smilingcat6, are you growing - to dry them, if so which technique do you use?
  
  

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