Looks like a little dark centered feverfew bloom!

Does anything fly around when you scrape at it? If you examine some scraped residue on dark paper do you see a dried out shape with legs?

The 2 white insect buildups I'm familar with are whitefly and mealybug. But I haven't seen a circular pattern. This is the time of year for whitefly in our zone. If you have a knowledgeable nursery person take them a branch for id.

I would cut off affected growth and if it began on newer growth I'd use Bayer all in one product.

Is it only on the older leaves?

Lantana gets Entomosporium leaf spot during wet and/or humid weather. Self limiting when the weather changes.

Interesting. In drought ridden So CA, we did have some rain, and it might be due to that! New growth is clean and green! So, no worries? It's just a life cycle?
Suzi

We'll hit the plant with Bayer. We have a few Lantana's in our yard, and this is the only one affected. Yes, it's currently only on the older leaves.

I don't see anything flying around, but if anything is munching, Bayer will do the trick.

Thanks!

will also kill any bees that visit the flowers. you sure it is not bird poop?

I got that before. It was just a little the first year but the year after it was really bad. I hope you can find out how to cure it.

The cause isn't insects. Don't try to kill something that's not there with unnecessary pesticides.

I think that it is a kind of disease

Well, I'll know if rain causes it because this weekend rain is predicted. It's odd because only one of my lantanas is affected. There is another, spaced about 4' from this one, and it's fine!

I'll take a leaf to the local real nursery, and see if they can ID the problem.

Thanks,

Suzi

Lantana is almost bulletproof here. I would prune out and discard the old nasty leaves and let the garden gnomes work the rest of it out. :)