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Tomato leaves are turning yellow and rotting...halp!?

Hi forum,
Complete tomato novice, never grown them in my life. I was handed 5 really quite small plants, the tallest being maybe 20cm in height at the start of the year.

When things warmed up, I planted each in the ground with what I felt was probably enough space, 30cm or so between.

Well, they have gone BONKERS. The tallest is now well over 10ft in height, all 5 have crossed over and shot sideways and up and down and across. Tomato's everywhere!

But in the last few weeks one plant in particular has begun to show signs of sickness. Its been raining again here non stop for a week so its wet anyway, but the leaves, particularly those 'deeper' inside the growth and against the fence have turned an ugly yellow and then rotted quite badly. On the one plant it probably covers about 40% of the leaves. The fruit seems to be managing ok but it definitely doesn't look good!




Girlfriend included for scale. :)

But you can definitely see around the back/bottom in the more shaded areas the leaves are struggling. I have zero doubt that they aren't getting enough space, this was a rookie mistake and entirely my fault. 

I just wonder if this isn't something other than the plants being under stress, that they might actually be sick or infected or worse?

Any help, advice or assistance would be useful, I hadn't really planned on providing crops to the neighbourhood but one plant already has over 100 tomatoes on it...so I would be sad to lose them all. 

Thank you again in advance. 

Posts

  • BobTheGardenerBobTheGardener Posts: 11,385
    It could be blight, especially if there are any darks marks on the stems as well.
    If so, it may be wise to sacrifice that particular plant before it spreads - don't compost it.

    A trowel in the hand is worth a thousand lost under a bush.
  • It looks like there are too many leaves blocking air circulation and light. Cut off all but the top three or four leaf stems. This also puts more of the plants energy into the fruit.
  • LynLyn Posts: 23,190
    Next time, cut the tops off when they are as tall as your girlfriend and pick out side shoots as soon as they appear,  unless you grow one the Plumb types, if those, you don’t pick out the shoots but then they don’t grow that tall. 
    Gardening on the wild, windy west side of Dartmoor. 

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