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What is this tomato infection?


Any ideas what is causing this? It is affecting one of four tomato plants (each a different variety) I grow in my unheated greenhouse. There are no signs on the adjacent toms, but this one (a beefsteak) has it on all the leaves except newly emerged ones. I have been removing dodgy leaves, but that is over half of the foliage!


  • mushermusher Posts: 389

    Not sure, may be Tomato Blight

  • It looks like it to me too, but this is in a greenhouse, has never had rain on it (since it left the garden centre) and it has not spread to adjacent plants!

  • DovefromaboveDovefromabove Posts: 83,762

    Doesn't look like blight to me. Could the leaves have got wet during watering then scorched by strong sunlight? 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • Pete.8Pete.8 Posts: 10,249

    I doubt there's anything much wrong with your toms.
    If you could post a pic or 2 that would be a big help - when the photo upload is working again.
    It's unlikely to be any sort of bacterial, viral or fungal leaf spot. Nor is it blight
    There may be a slight magnesium or calcium deficiency which could be remedied with a good drench of diluted seaweed extract.

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
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