Plan the perfect garden with our interactive tool →

How to Control Bugs on Brussel Sprouts

Zedcor Wholly Owned/PhotoObjects.net/Getty Images

The types of bugs plaguing Brussels sprouts include cabbage root fly, caterpillars, aphids, flea beetles, Harlequin bugs, cabbage loopers, diamond back moths, imported cabbage worms, cutworms, cabbage maggots, thrips and web worms. Aphids are particularly difficult to manage and are controlled by starting early with a very strict control program.

Step 1

Plant marigolds or tagetes with Brussels sprouts. Companion planting controls pests and works by attracting beneficial insects that feed on the aphids, such as ladybirds and certain types of flies. Turnip, kale or mustard plants attract beneficial insects that feed on harlequin bugs.

Step 2

Apply insecticides early in the season when the risk of killing beneficial insects is lower. Wash the leaves weekly with insecticidal, fatty-acid soaps according to recommended dosages, and then rinse the plants with a strong stream of water, and spray with organic pesticide containing neem oil. Repeat this weekly as the effects of the soap and the neem oil only last for a day or two. (Refs 4)

  • Plant marigolds or tagetes with Brussels sprouts.
  • Turnip, kale or mustard plants attract beneficial insects that feed on harlequin bugs.

Step 3

Place a layer of aluminum foil underneath the plants. This reflects light against the leaves’ undersides, heating them and making it uncomfortable for the bugs.

Step 4

Introduce parasitic wasps. These insects lay eggs inside the aphids, killing the aphids, forming brown, crusty case called a mummy. Once mummies start appearing on the plants, the aphids remaining time is short-lived. The wasp also parasitizes the diamond back moths, killing a large percentage of them.

Step 5

Spreading garden fabric or floating row covers over the Brussels sprouts deters flea beetles, which are tiny beetles that jump like fleas. Regular hoeing keeps the soil around the plants clear of eggs and larvae. This also offers protection for the plants against cabbageworms.

  • Place a layer of aluminum foil underneath the plants.
  • Spreading garden fabric or floating row covers over the Brussels sprouts deters flea beetles, which are tiny beetles that jump like fleas.

Step 6

Kill cabbageworms and loopers with a biological insecticide called Bacillus thuringiensis, also called Bt, which is sold under different brand names. Spray the plants with Bt from the time you transplant them until ready for harvest.

Related Articles

How to Get Rid of Aphids & White Flies on Basil
How to Get Rid of Aphids & White Flies on Basil
How to Get Rid of Squash Bugs
How to Get Rid of Squash Bugs
The Lowest Temperature of Marigold Plants
The Lowest Temperature of Marigold Plants
How to Kill Buckhorn Plantain
How to Kill Buckhorn Plantain
Tiny Flying Bugs in House Plants
Tiny Flying Bugs in House Plants
Homemade Aphid Insecticide
Homemade Aphid Insecticide
Vegetable Gardens & Plant Lice
Vegetable Gardens & Plant Lice
Natural Alternatives to Sevin in the Garden
Natural Alternatives to Sevin in the Garden
How to Get Rid of Bugs in Petunias
How to Get Rid of Bugs in Petunias
Brown Spots on the Leaves of Green Beans
Brown Spots on the Leaves of Green Beans
How to Get Rid of Aphids on Petunias
How to Get Rid of Aphids on Petunias
Lowest Temperatures for Pepper Plants
Lowest Temperatures for Pepper Plants
Care of Abutilon plants
Care of Abutilon plants
Insects on Sweet Basil Plants
Insects on Sweet Basil Plants
Homemade Pest Control for Collard Greens
Homemade Pest Control for Collard Greens
Bugs That Eat Cucumbers
Bugs That Eat Cucumbers
What Bug Is Eating the Leaves of My Pepper Plants?
What Bug Is Eating the Leaves of My Pepper Plants?
Herbs That Kill, Control and Deter Fleas, Ticks & Mosquitoes
Herbs That Kill, Control and Deter Fleas, Ticks & Mosquitoes
Garden Guides
×