Ask a Question forum→what is causing this tomato leaf problem?

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douglasville, GA
Hsiaokuo62
May 3, 2020 6:46 PM CST
I bought 2 tomato plants 2 weeks ago from a local farmer, they were fine with no spots. Almost right away the lower leaves developed small brown spots with yellow around the outside of the brown. I asked the grower, he said remove the brown leaves and throw them in the trash, which I did each day for several days as the problem moved upwards on the plant.

Now there are not many leaves left. All seem to be developing the spots. When I first noticed spots I sprayed the leaves with a solution containing essential oils which seemed to work in the beginning, but then we had several days of rain and I forgot to check them for a few days after that, and by that time it was much worse. I also transplanted some oregano from another part of the yeard to be near the tomatoes in hopes of helping but no luck so far.

1) what might this be? and
2) any natural methods for controlling?
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Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
May 3, 2020 8:47 PM CST
I think the farmer sold you tomatoes suffering from Septoria leaf spot. His instructions to pick off the affected leaves and dispose of them suggests he knew that.

Its a fungal disease. Treat them with a copper-based fungicide and hope for the best. If the fungicide doesn't stop it, pull the plants and put them in the garbage. Other plants and trees are suspectable.

Get your tomatoes someplace else next year.
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gardenfish
May 4, 2020 1:26 AM CST
I agree with Daisy. I had this disease on some of my tomato plants last year. Copper is the answer, if you catch it early enough. With plants that small, disposal is the best answer. Start with fresh plants. RE essential oils; other than Neem Oil, , these are not good to use on new growth of plants, specially in the South. They really don't do much toward treating disease, and when used on new growth, they can kill the new foliage after spraying when the sun hits it. I know this from personal experience.
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douglasville, GA
Hsiaokuo62
May 4, 2020 11:01 AM CST
Thank you both! Good advice, I will take it.

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