I have some tomato plants indoors. Recently a number of very small (1 mm or so) moths dwell on the leaves.
What are these? Are they harmful? What can I do about them?
Chances are very good this insect is commonly called whitefly. As a tomato plant is considered an annual and we are are getting close to end of season where I live you could ignore the problem as they do not damage the fruit.
If you are keeping the plant indoors then you should act quickly or the whitefly can spread to a wide variety of plants. Check the link for recommendations: What has worked for me is: