All 3 trees did well in full sun today. No burns or damage.

Good deal. It stays on for months. You will see iridescent color on leaves. I have much less rust. But i have over 50 inground trees last year i had rust everywhere. Now just a few leaves.

I intentionally remove leaves from inside the fig tree leaf canopy.
This allows air circulation through out the plant.
Excessive moisture that does not get dried out naturally will
increase the rust problem. I have never sprayed anything for rust.
Leaves will fall off others will grow in to replace them.
I have never had a problem with rust so long as the plant can let air through
freely.

Doug