Goldish-brown spots on leaves with tiny black dots

[orlando]

I hope some of you can help me diagnose what's wrong with some of my tomato plants. Some of them have started developing small golden-brownish spots on their leaves and they all seem to have tiny black dots inside those spots (looks like lice).

I'm attaching a picture but it doesn't really show the problem well.

Thank you for your help!

[greenthumbomaha]

I can't tell from the pic , but bumping this in case someone can help you. Maybe give us an update on how your plant is doing.

[RayR]

The spots look white on the picture.
Look under the leaves for insects. Aphids?

[Tonio]

+1, it looks white, but I can see a undertone of light brown.

What is the medium, straight peat? Appears you are watering from above??

[orlando]

Thanks for the ideas and bumping this up.

I didn't figure out what the disease was, but I managed to isolate the infected plants from the rest and on those I also cut off the infected leaves. The rest of the plants seem fine now.

The source of the infection was found to be basil plants that I grew throughout the winter inside, but didn't hold up to well.