Organic Control of Leaf Miners and Grubs

Leaf miners on columbine and grub infestations in lawns can be managed with organic products that spare beneficial organisms.

Leaf Miner Control

• Pyrethrum or rotenone sprays—plant-derived, low toxicity to mammals.
• Apply when miners are active; repeat as needed.
• Sources: Gardens Alive, Planet Natural.

Grub Control (Organic)

• Beneficial nematodes (e.g., Grub-Away) – microscopic worms that parasitize grubs.
• Milky Spore (Bacillus popilliae) – targets Japanese beetle grubs only; lasts 15+ years with one application.
• Milky Spore is cost-effective long-term despite higher upfront cost.

Avoid broad-spectrum chemicals to protect earthworms and pollinators.