Still a little tough to see details in the small images other than the close up of the leaf.

But now that I know it's lantana, likely the problem is Entomosporium leaf spot. Very common during rainy weather. In other words, they can look quite tough by the end of winter Some can lose all leaves.

Sprays won't help at this point. The only use for them is to protect the new growth while environmental conditions are correct for the disease.

One of the usual suggestions is to avoid overhead watering. Can't do much about rainfall, but can avoid sprinkler irrigation or frequent hosing them off. They do very well when quite dry, as long as they are well established.

Jean
who gardened in Long Beach, CA, for 30-some years.

Fotos not much help, but along jean's lines I found in Sacto that lantana doesn't like too much water and hard overhead water caused leaf damage that fostered fungal growth. They also appreciate good drainage and little fert. My impression from lo-quality fotos is a general overall unhappiness allowing pathogen attack. If there is salt in your water and overhead watering, that's the main culprit.

Dan

Thanks, all. I didn't know I could use larger images if I used photobucket. (The leaf will get a lot bigger if you click on it.) Anyway, here's an attempt to show more of the detail of the plant.

Here is a link that might be useful:

Grew those things for years. And if OP is in SoCal, yes, the water is high in soluble salts.

The problem is a fungal leaf spot caused by Entomosporium. The underlying cause is an overhead water source - rain or irrigation.

When I lived in CA -- left 13 yrs ago -- only management was no overhead water, plus prune off nastiest branches. If well established, it will grow back quite rapidly. Perhaps the recommendations have changed.

that said, fungicide is applied to protect new growth. Nothing gets rid of existing spots/disease except pruning.

Thanks, Jean. I'll only water at the roots, cut off the bad branches and try to find a good fungicide.