I noticed this on some on my Carolina Reaper plants. A lot of the leaves have this kind of spots surrounding the midrib and the veins.

The plants grow indoors in 5l pots but I kept them in the garden for a period of about half a year when the temperatures were higher.

brown spots next to the midrib and veins of a chili pepper plant's leaf

Some of the spots can be seen on the underside of the leaf as well.

Here's a picture showing the distribution of the spots on a leaf's upper surface.

What am I dealing with here? Some kind of pest? A disease? Or maybe the plants are lacking something?

enter image description here

Bacterial leaf spot comes to mind but I;ve never actually seen it and the pictures I can find online look somewhat different.


It's a sap sucking pest of some sort, which is why the damage is largely along veins - but it looks like whatever it was has gone, because your first photo only shows evidence of damage where they've been, rather than the insect itself. I can't see the black specks clearly enough in the second image to determine whether they're insects or not - use a magnifying glass and check. If whatever they are is sitting on top of the leaves, do the marks beneath correspond with their position? If so, and insects are present, then that's likely the result of their sap sucking activities. Hopefully, they have not introduced or caused a fungal or bacterial infection to set in, which is always possible from such activity.

  • I can't see any bugs on the leaves, if there are any, they're extremely small. I have moved these plants away from my other ones and I'll keep monitoring them. – toniedzwiedz Nov 25 '17 at 17:43
  • It later turned out I had had a problem with thrips gardening.stackexchange.com/questions/41997/… I ended up throwing the plants I was keeping indoors. The ones brought from the outside for winter were not affected. – toniedzwiedz Jul 21 '19 at 15:44
  • Nice, clear photo of a thrip insect n the question you link to... – Bamboo Jul 21 '19 at 15:50

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