

Can fungus gnats cause my jade to literally drop it's branches?
My jade has had a quite a bad case of fungus gnats over the past few weeks, despite the traps you can see on the photos. I'm about to treat it with nematodes today and I find it's lost one of it's 15cm branches?! All the leaves that were lost were pretty healthy too. Is this the fungus gnats doing or something else? I also added cinnamon to the soil a few days ago.
You can see the spot where it lost the branch in the 2nd pic