Effective Garden Inchworm Control: Natural and Chemical Methods

Inchworms—named for their 1-inch larval length—move by pulling their rear forward, creating a distinctive hump. Despite charming appearance, they destroy fruits and vegetables efficiently.

Targeted Chemical Treatment

Fill hose-end sprayer with Bacillus thuringiensis (Bt) at 3 tsp/gallon water. This naturally occurring soil bacterium concentrate targets worm-like pests without harming plants. Attach to garden hose, set nozzle to shower, spray plants thoroughly at 1-foot height with medium pressure. Evening application avoids sunspots and evaporation. Repeat every three days.

Supporting Natural Control

Plant bird-attracting species: junipers, marigolds, witch hazel, sunflowers, black-eyed Susans. Birds become allies controlling future inchworm populations. Many London gardeners and experts advocate this green, organic approach over harmful pesticides that damage soil and plants.