Not flies, not moths, whitefly are about the size of gnats. If you see these little clusters of flies when you brush through your foliage, you need to control them.
Whitefly sucks the sap out of the plants – resist damage organically with Neem Oil. Mix your Neem oil in a sprayer, and spray all over the plant. Don’t miss the undersides of the leaves.
You’ll need more than one treatment – apply again in a week and then a week after that. Neem oil will also help with a variety of other soft-bodied insects like aphids and spider mites.