Are ants on crepe myrtle trees harmful?

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Ants on your tree is usually a sign of aphids, which can be harmful. You can get rid of them by spraying the leaves with a mixture of a bit of dishsoap and water
The ants won't hurt your tree, but they harbor aphid eggs. The aphids don't hurt your crepe myrtle tree, but they will create a sticky mess on the tree leaves. Not the end of the world, depending on where your crepe myrtle tree is. Ants rarely disappear;they'll just show up somewhere else. Encouraging birds and beneficial local bugs creates a balance.
Wow! I like the cheap formula to wipe out the aphids.