I'm a newbie, but here is how I saved some of my baby fig trees last year with BT spray. If you have no roots on your cuttings, it may be easier to just remove them from the soil, spray with BT, put them in a ziploc wrapped in a damp paper towel for a night, and repot them when you see no more gnats on your cuttings.
If you have lots of roots and need to save what is left, spray the soil with BT until saturated, repeat according to directions on bottle. This worked for me and I could see when it worked, since my cups were clear.
Lastly, prevent re-entry of future gnat hoardes with a layer of sand over top of soil and make sure they can't reach drainage holes either. This was a great tip another F4F member posted last year. So sorry, those gnats are a pain!
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