Yellowing Leaves on Tomatoes - Knowledgebase Question

Edison, NJ
Question by AlanGretsky
July 22, 1998
The bottom leaves of my Tomato plants suddenly are turning yellow and falling off. It also appears that there is a grey powder like fungus on the leaves. What is causing this and what can I do to stop it before it kills off my tomatoes? The plants just formed some nice size tomatoes but I have yet to get a red one. I planted Rutgers and Orange Oxheart.


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Answer from NGA
July 22, 1998

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Tomatoes are subject to a number of diseases, but it sounds like yours may be suffering from late blight. This will also cause small, dark, "watersoaked" patches on the leaves and the tomatoes will have greenish grayish spots on them which then turn brown and hard. You might wish to take a sample to the County Extension office for a positive identification of the problem (their telephone number is 745-3445). Unfortunately there is no cure for late blight and if that is what has happened, the plants should be dug up and removed and destroyed, along with any debris from them. I'm sorry about your plants.

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