Pests and Diseases forum→tomato stems

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May 14, 2020 12:35 AM CST
Thumb of 2020-05-14/mountainmanjoe/726fba

A whole bunch of my tomatoes developed this "bark" on the stem. Is this a fungus? Can it be corrected with baking soda solution or something?
Foothills of the Italian Alps
May 15, 2020 7:36 AM CST
The damage your plant has is called a stem lesion.
It's usually caused by environmental or mechanical causes, meaning the only solution is to remove those causes: on plants grown indoors that kind of damage it's usually caused by being too near to a heating source, especially a stove or some other kind of heater, or to a window pane acting like a lens. If you have a propane heater check it's working properly: propane is extremely toxic to tomatoes even in minuscule amounts we humans can brush off, and will cause stem lesions looking exactly like that.
I am just another white boy who thinks he can play the Blues.

May 15, 2020 11:50 AM CST
there haven't been any heat sources.

The only thing mechanical was me holding the plant during re-potting.

If it was collar rot, it would be more black right?
[Last edited by mountainmanjoe - May 16, 2020 4:52 PM (+)]
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