Tomato diagnosis - Knowledgebase Question

Brooklyn, Ne
Avatar for paulbasile
Question by paulbasile
July 30, 2010
A couple of my tomato plants are showing yellowish/whitish spots on their leaves but still producing. Other plants (different varieties) look entirely healthy but aren't fruiting at all. What are some possible explanations? fixes?

Answer from NGA
July 30, 2010
It's really difficult to diagnose a problem with tomatoes without actually seeing the plant. The yellowish/whitish spots can indicate sunscald, especially if they are only on the topmost or most exposed leaves but not on the leaves that are protected from the sun. Or, the spots can indicate an insect injury or the first stages of a disease. Sorry I can't be more specific but without a magnifying glass and a few of the affected leaves, it's really difficult to pinpoint the problem. What you might want to do is visit the following diagnostic website put together by Cornell University. It has photos of the most common tomato diseases and might help you positively diagnose the problem: http://vegetablemdonline.ppath...

It's a long address so you may need to copy and paste it into your browser's window. As far as the lack of fruit production on your other plants, a couple of possibilities come to mind: Tomato pollen isn't viable when temperatures are much over 90 degrees, so fruits won't set. The good news is that once a plant begins to set fruit, other fruits usually follow. So at this point it's a bit of a waiting game. Another possibility is that the flowers aren't being pollinated. There aren't as many pollinators around as in past years. Try gently tapping and shaking your plants in the early morning to see if you can get the pollen to move to the female parts of the flowers so some fruit to set. Good luck with your tomatoes!

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