Organic Control of Sowbugs (Pillbugs) in the Greenhouse

Sowbugs (woodlice) are crustaceans that normally eat decaying matter but can damage seedlings in greenhouses. They're nocturnal, moisture‑loving, and hide in cracks.

Organic Management

• Reduce habitat: keep area clean, dry, and seal entry cracks.
• Encourage predators: frogs and toads eat sowbugs.
• Diatomaceous earth: dust around plants; abrasive to soft bodies.
• Lemon ammonia spray: 1 Tbsp lemon ammonia + 1 Tbsp liquid dish soap per gallon water, applied to soil.
• Pyrethrum/rotenone: botanical insecticides (use sparingly, follow labels). Source: Planet Natural.

— Mack Jean, Master Gardener, Tennessee