What kind of marigold is it supposed to be? Tagetes? Calendula? Its hard to tell from the image, but maybe its a Tagetes of some description. Is it in a pot or the ground? Anything odd under the leaves?

I’m not sure what kind. It’s in the ground. There is some webs on them.

If its a Tagetes variety (and I think it probably is) spider mites love them where you are - they can usually be found underneath the leaves, but you might need a magnifying glass to see them. If there's webbing, its likely those - they suck the sap out of the leaves, causing this type of unsightly damage. Its a bit late now to try to deal with them - neem oil might deter them, but the leaves which are damaged will not get any better. Info in the link below

https://homeguides.sfgate.com/marigolds-tomatoes-spider-mites-51810.html