Hi Flax:That is the Fig Mosaic ,and How it show at the end of the growing season,in your climate.
I would not be worried about it and do not spray with anything.
Just Give your trees Mulch Or Manure around them,and if you have some Limestone powder ,apply only ,if the soil is acidic.If the tree refuses to grow for about three years in a row and do not fruit as it should be the only corection you can do is Discard that tree.
Some trees fight off and win the fight against Fig mosaic,and some loose.
There is not cure to it.
Happy Gardening

I would have thought it was rust, rather than mosaic. If mosaic typically looks like that then I am mis-informed about what I have been calling mosaic up til now. Maybe that is just a more advanced state of mosaic than I am used to seeing.

I would echo Herman's suggestions, but I would also add that were I you I would make sure not to compost those leaves, but to destroy or throw them away once they fall.

~Chills

That's very bad information! All my plants are from Edible Landscaping and all have phytosanitary certificate. We have last week extremely rainy weather with high-water in some areas here and I was hoped that it's caused by high humidity in the soil.

Rust!

Ok, so if it's rust, is it dangerous for my plants or must I leave it as it is? Is it caused by wet weather or it is some disease which I must heal.

Rust is a fungal problem caused by excessive wet conditions. Either too much rain, too much humidity, water spraying the fig tree and leaves, etc. If left alone, it will eventually cause the leaves to curl up and fall off. If some cases, the entire tree will lose it's leaves but rarely will it kill the tree. To control it's spread, you need to spray the tree with a fungacide, such as Bordeaux spray, and pick up the leaves that fall on the ground and discard them. If you are allowing the tree to be sprayed by water, either directly or indirectly, such as from your grass sprinklers, you need to stop this practice. Fig trees need to be watered at the soil level. Too much exposure to wet conditions is what causes "Rust". I can read your frustration by all of this but there is nothing wrong with your trees. This is not a disease carried within the plant. It is one that can be avoided with the proper care.

leon: thank you very much for your help!

I live in Oklahoma, USA, Zone 7. Oklahoma is normally a relatively dry climate with about 30 inches rainfall per year. This year, we have already had well in excess of 50 inches and have already doubled the normall rainfall. I have exactly the same problem with figs that I am rooting in pots and 2 that are in the ground. I purchased the Bordeaux powder to spray and am wondering if the fungus is limited to the leaves that are spotted or if it is all over the plant and only shows on those leaves. Should I just prune those spotted leaves off the plant and spray the rest or should I spray everything and leave the spotted leaves on the plant for them to fall off on their own?

Thanks for all the responses that you all have posted.

Bob

You can remove the real bad leaves. You'll notice that they'll almost fall off on their own anyway. Then spray the entire tree and try to spray under the remaining leaves as well. The spores are all over the tree. We're nearing the dormant season. I would spray the bare tree after all of the leaves fall off.

I think that is a fungus but not rust fungus.
It seems leaf spot is a different fungus that it spreads into the same conditions.
The preventive treatments usually are made using cupper but the curatives solutions are made using specifics fungicides for leaf spot.
However the growing period for figs is finishing.