Chemical Control for Fungus Gnats on Meyer Lemon: Ortho Home Defense Max

A Ready-to-Use Soil Drench

If sticky traps and potato slices haven’t cleared a stubborn fungus gnat infestation, a targeted soil treatment can break the cycle. Ortho Home Defense Max (0.05% bifenthrin) is labeled for indoor/outdoor use and is applied directly to the soil surface—no need to disturb the soil afterward.

Application Tips

• Test on a few leaves first to ensure no phytotoxicity.
• Follow label directions exactly.
• The product kills larvae on contact and provides residual protection.

Fungus gnat larvae feed on fine roots, so eliminating them protects the tree’s root system while ending the nuisance of flying adults.