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Tomato Blight Problems Continue

• Message 1. 

  Posted by Mr G Jones (U13823788) on Sunday, 15th August 2010

  Hi,
  
  Can anyone suggest what do to about tomato blight.
  This is the second growing season that I have experienced a problem with .
  tomato blight.
  My tomatoes are grown in a greenhouse, with two roof vents, which have temperature controlled automatic openers. I often leave the door open depending on temperature
  My tomatoes are grown in large pots on a concrete base.
  Any suggestions, or assistance will as always be gratefully received.
  Thanks in advance for any assistance.

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• Message 2

  , in reply to message 1.

  Posted by farmerSteve (U2644680) on Monday, 16th August 2010

  you obviously have plenty of ventialation which is important.
  Take care with watering do not water the leaves.
  Do not get water on the floor
  remove the greenhouse shading if you have any
  you need the tmperature inside higher than the outside this will ensure the Relative humidity is always low
  You are certain it is blight I presume?
  any patches on the leaves should be matched by a mildew on the back of the leaf.
  I have never had blight on my tomatoes inside

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• Message 3

  , in reply to message 2.

  Posted by greensward (U14347965) on Monday, 16th August 2010

  Hi, I agree with Steve, wet conditions are the biggest cause of blight which is why it is most common on outdoor tomatoes. It is important to have air circulation in the greenhouse and I always kept a small fan handy for still days/nights to keep the air moving.
  If you have blight do not put infected plants on the compost heap, burn them or put them in a plastic sack for disposal, as the fungus spores can survive in the compost and you will spread them back onto the soil.

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• Message 4

  , in reply to message 3.

  Posted by PurpleLuv (U5258511) on Monday, 16th August 2010

  Just a thought, are you sure it is blight?
  
  Not testing anyones inteligence but in the past 80% or more people that said to me there tomatos have blight have other problems, the common one told to me is Blossom end rot in people new to growing.

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• Message 5

  , in reply to message 4.

  Posted by someolehooker (U13845960) on Monday, 16th August 2010

  If people new to growing can get blossom end rot it is going to be a hard job to spread the word!!
  

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• Message 6

  , in reply to message 4.

  Posted by thevodkarose (U13048111) on Monday, 16th August 2010

  Mine looked like they had "blight" at one point. It was the lower leaves naturally dying off. If in doubt, remove affected leaves and fruits as a precaution. My golden rule of blight spotting is that if it is blight, you'll KNOW it's blight.
  
  See what I mean?

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• Message 7

  , in reply to message 2.

  Posted by Mr G Jones (U13823788) on Monday, 16th August 2010

  Hi Steve,
  Yes I'm sure its blight, firstly the leaves wilted turned yellow and then brown, I removed all effected leaves, but now the stems as well as the unripe tomatoes are showing evidence of decay, brown/dark spots etc.
  I will take on board your suggestions for next years growing season.
  Thanks for your valuable suggestions.
  Thanks,
  Geraint

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• Message 8

  , in reply to message 7.

  Posted by FallingApple (U14555521) on Monday, 16th August 2010

  If the fruit is affected then it could well be blight. However I have had several plants in GH with brown blotches on leaves, which started 6 weeks ago. Stems and fruit fine 6 weeks later. I think mine might be brown leaf mould. Never had blight in GH only outside where it ripped through the stems and fruit in no time.

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• Message 9

  , in reply to message 7.

  Posted by farmerSteve (U2644680) on Tuesday, 17th August 2010

  This is certainly NOT blight but senescense of the older leaves
  The marks on the tomatoes are probably from poor watering I think it is related to both Calcium and Magnesium shortage. I am no expert on thisd problem though and sometimes suffer myself
  Blight is exhibited by grey/black splodges on leaves very often starting at the leaf tip and youger leaves are normally affected first. There is a very charachteristic mildew on the back of the leaf to correspond to the splodge on top
  To those who strongly advocate the burning of the leaves etc there is no harm in this but blight will die with the leaf and blight is present everywhere so the leaves can safely go on the compost heap

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