Zucchini Root Maggots: Identification and Organic Control

Root Maggot Damage

Plants collapse with eaten roots; millipede-like larvae in soil = root maggots (fly larvae). They tunnel roots, killing plants.

Prevention (Best Approach)

• Floating row covers at planting—exclude egg-laying flies.
• Wood ash / diatomaceous earth / hot pepper around stems—deters adults.
• Crop rotation—don't plant cucurbits same spot 3 years.

Rescue for Current Plants

• Beneficial nematodes (Steinernema) watered into soil—kill larvae.
• Available from Gardens Alive, Arbico, online.
• Apply evening, soil moist, 60–80°F.

Sanitation

Remove/destroy dead plants immediately. Don't compost—pupae survive.