Inchworms on Indoor Hydroponic Herbs: Identify and Treat with Bt

What They Are

Inchworms = geometer moth larvae (caterpillars). White specks = eggs, cocoons, or feeding damage.

Safe, Targeted Control

1. Collect a few worms and a leaf with specks in a sealed bag.
2. Take to a garden center; ask for Bt (Bacillus thuringiensis) powder.
3. Mix per label, spray all foliage thoroughly.
4. Repeat as directed. Bt kills only caterpillars; safe for humans, pets, beneficial insects.

Why Bt Is Best

Biological, specific, no residue concerns for edible herbs. Rinse leaves before eating.