Fungus Gnats on Dieffenbachia: Source and Solution

Fungus gnats almost always come from repotting with new soil. Larvae live in the added top layer.

Fix It

1. Remove all loose soil added on top of original rootball.
2. Let top ¼ of rootball dry before watering.
3. Dieffenbachia tolerates drought better than gnat larvae.

Yellow Leaves?

Likely root rot from the same repotting. Dry soil helps both issues.

Prevention

• Don't repot unless essential.
• Never add soil on top of rootball.
• Use sterile potting mix.

If unsure, share a photo of the whole plant in its pot.