Possible bacteria spot or speck on tomato plants?

Asked July 15, 2016, 1:10 PM EDT

Hello, We have been noticing small dark brown spots appearing on several tomato plants, leading to eventual leaf and stem loss. It seems to have started on one plant and spread to the others. I'm attaching a photos from affected plants. I'm not sure how to discern which disease this is, and what if anything can be done about it? I'm also attaching a photo of a tomato plant with leaves with raised bumps, without the brown spots.

Baltimore County Maryland tomato diseases vegetable tomatoes tomato bacteria spot tomato bacterial leaf speck

1 Response

It's hard to say for sure if this is tomato bacterial speck or spot. (The center photo looks like neither--probably something cultural. )

Here is our info on bacterial speck or spot from our website's Grow It Eat It section called "Problems" : http://extension.umd.edu/growit/bacterial-spotbacterial-speck-vegetables

Both of these diseases are uncommon. Early blight is much more common and that, or Septoria, may be what you're seeing. The clearest way to distinguish these from the Bacterial speck or spot is going to be the appearance of the fruit. The tomatoes should show raised pimples or lesions if it is, indeed, bacterial speck or spot. Check out the image in the link above and look at other online. You're welcome to send us photos of the fruit, if you see symptoms.

You might want to try a copper fungicide. Also, pull off as many infected leaves as you can. Clean up all these plants at the end of the season.