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First off, I am not sure this is Septoria. I believe it is. It is a spot disease. These plants had spots on the leaves and it looked like Septoria. All my leaves of any infected plant were cured by removing the leaves with spots and spraying the upper and lower sides of the remaining tomato leaves with my sulfur spray.
All in all I removed one plant. Leaves that had spots here and there were removed ASAP. I did spray all my plants as prevention that is standard practice for me now. They will get sprayed a minimum of 1x weekly. I am tracking if the spray does any damage. So far none noticed. All my plants are flowering and now I am seeing if the spray effects tomato production, that is will sprayed flowers turn into tomatoes.
My new experiment and I would suggest you view this as an experiment and try it out as just that... is to scrape away the spots on the stems of tomatoes. I have pictures. Scraping the spots takes off just the outer layer of the tomato stem. My theory is the spots are active and don't die off even when covered in spray. The second part of my theory is that the stem of a tomato is quite hardy and can heal. It is better to damage it and let it heal rather then leave the spots there, I think.
The concerns... Leaf spot could spread more quickly by damaging the plant and scraping the infected areas. I do know about spreading internally because Septoria or leaf spot is not a virus. It spreads externally. Wounding the plant won't introduce a virus into the plant. This is getting a bit scientific. If you count guessing as scientific.
I do three things.
- Scrape the spots without touching the rest of the plant with my fingers or razor
- Spray the freshly scraped spot with sulfur spray
- Spray the surrounding leaves with sulfur spray once done with the plant
Pictures of the spots on the stems:
These pictures will give you a good idea of what I am targeting. I actually just scraped them away.
|A Really Good Picture of Spots on a Stem|
|If You Enlarge This, You Will See Spots and Scraped Spots.|
|Scraped Stem to the Left and Spotted Stem to the Right|
|Scraped Stem. Notice How Shallow the Scraping Is.|