By Oddbillie
WALES,
United Kingdom 
We have a yellow tomato plant in the GH, along with 6 other red tom plants. The yellow has a number of good size toms on it now but when I went in today, despite them all looking quite healthy, this one pictured looked like this.
Any idea what it might be and is it blight?
14 Jul, 2010
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It's either blight or bottom end rot Dan. Check the stems and leaves of your plants and if they have the same growth on them then get rid of the plant. Don't put it in your compost as it can live in the soil for years and will infect everything around it.
I have a photo of a tom. plant with blight in my photos. Page three, bottom row.
By the way, bottom end rot is caused by infrequent and/or insufficient watering!
15 Jul, 2010