Fungus Gnats in Outdoor Bog Garden: Unusual—Check Setup

Southern California. Tote-container bog garden outdoors. Fungus gnats in peat. Sticky cards catch adults but steal prey from other plants. Want biological control: Hypoaspis miles or others?

Unusual for outdoor bogs. Usually a greenhouse/indoor issue. Suspect setup problem (overwatering? poor drainage? organic buildup?), but can't diagnose without details.

Organic Controls

• Pyrethrin (plant-derived, organic-certified) — weekly until gone.
• Neem oil — same.
• Mosquito dunks (Bti) — targets fungus gnat & mosquito larvae. Safe for everything else. Sprinkle on soil, top-water to activate. We use this in summer.
• BotaniGard (predatory fungus) — kills insects broadly; greenhouse use.

Beneficial insects specific to fungus gnats: not well-established. Bti dunks are the most targeted, CP-safe option.