How to Control Worms on Brussel Sprouts


Brussels sprouts are a variety of cabbage that is a biennial plant partial to cooler growing temperatures. Brussels sprouts are a hearty plant that grows slowly and as such is susceptible to damage from insects and worms. Cabbageworms, cabbage loopers and cutworms are three varieties of worm that can wreak havoc on a brussels sprout crop if not properly controlled.

  • Obtain a biological insecticide like bacillus thuringiensis. It is often sold under varying brand names. Mix a couple of drops of liquid detergent into each gallon of insecticide spray to ensure the waxy coating of the leaves gets sufficiently wet.

  • Apply your bacillus thuringiensis insecticide with a standard fertilizer spray applicator to the leaves and soil.

  • Create a cardboard collar and place it around new transplants to prevent cutworms from damaging the stems. Position the collar 1 to 2 inches above and below the soil. Obtain or fashion a piece of cardboard similar in shape to a toilet paper roll that fits snugly on the stem. Slide it around the stem of the plant before you plant it in the soil. Ensure the collar is a little above and little below the surface.

Tips & Warnings

  • Use the insecticide on your plants from the time they are transplanted until they are harvested.

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