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What causes leaves to develop this back?

Saluda, SC(Zone 8a)

When cleaning overgrowth of wild morning glories from my yard, I discovered most of the vines where filled with leaves that look like this.
Will this affect other flowers and what should I do with infected vines other than destroy?

Thumbnail by gessieviolet Thumbnail by gessieviolet
Gautier, MS

gessieviolet, that looks like rust on the leaves. I get those too from too much rain. You should remove the leaves with rust and make sure they go into the trash not the compost pile if you have one. I heard some say to spray the vines with neem oil but I just don't know how it'll affect the rest of the leaves if it's in full sun. I bought some myself but have not used it yet.

Hope others can suggest solution to this problem.

Jacksonville, AR(Zone 7b)

I agree with Helena. You could spray with any of the fungicides after you remove the worst leaves.

Saluda, SC(Zone 8a)

These are weeds in my yard , I am destroying them; I am understanding they pose no particular threat to my other plants, right?

Gautier, MS

I have not seen any of my other plants with the rust on them.

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