yellow spots on young tomato leaves - Ask Extension
On March 20, 2015 I started over 100ea tomato plants from seeds in trays I washed first with soap and hot water. I put the trays under lights inside o...
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yellow spots on young tomato leaves #243983
Asked May 13, 2015, 11:25 AM EDT
On March 20, 2015 I started over 100ea tomato plants from seeds in trays I washed first with soap and hot water. I put the trays under lights inside our house. When they were ready, I transplanted them into 5" solo plastic cups with sterilized organic potting mix. Now they are from 4" to 12" tall. I noticed yesterday the Brandywines and a Russian heirloom strain "Cosmonaut Volkov" have yellow spots on their lower leaves. Some of the Brandywines have a sort of purplish tint to the veins on the underside too. Last year I had what I diagnosed as "late blight" in the Brandywines in early August and it eventually spread to almost all of my tomatoes. I don't want this to happen again. Should I destroy all the plants that seem to have this problem now?
Montrose County Colorado
Expert Response
Hello, Are you growing other plants with the tomatoes? Any flowers etc? Are you selling these tomatoes? Could you get a sample to the Montrose office and they can route it to me in Mesa County.
The spots and the purple veining could be the start of Tomato Spotted Wilt Virus. Heirlooms do tend to be more susceptible to viruses. I can run a test for some of the viruses. Here is a document on recognizing tomato issues.
http://www.ext.colostate.edu/pubs/garden/02949.html
You can contact me directly at <personal data hidden>
The spots and the purple veining could be the start of Tomato Spotted Wilt Virus. Heirlooms do tend to be more susceptible to viruses. I can run a test for some of the viruses. Here is a document on recognizing tomato issues.
http://www.ext.colostate.edu/pubs/garden/02949.html
You can contact me directly at <personal data hidden>
