By Grans_garden
Buckinghamshire,
United Kingdom 
Why have my tomato plants got yellow patches in the leaves?
2 Aug, 2012
Answers
Thank you that is very helpful.
3 Aug, 2012
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The most likely cause is magnesium deficiency. The leaves turn yellow but the green veins remain on the leaves. The treatment is epsom salts diluted with water used as either a feed or a foliar spray. You can buy epsom salts from the garden centres and the dilution will be on the pack.
3 Aug, 2012