Fighting gardening pests: Cabbage worms

Gardening is a rewarding hobby, but it comes with its fair share of challenges

Fighting gardening pests: Cabbage worms

In this article:


Gardening is a rewarding hobby, but it comes with its fair share of challenges. One common pest that gardeners often have to combat is the cabbage worm. These pesky creatures can cause significant damage to cabbage and other cruciferous vegetables if left unchecked. In this article, we will explore various methods and strategies to effectively control cabbage worms and protect your beloved plants.

Identification of Cabbage Worms

The first step in successfully fighting cabbage worms is proper identification. Cabbage worms are the larval stage of cabbage butterflies, commonly known as cabbage white butterflies or cabbage moths. They have a pale green body with velvety texture and can reach up to an inch in length. These worms are often mistaken for caterpillars due to their similar appearance.

Life Cycle of Cabbage Worms

Understanding the life cycle of cabbage worms can help in implementing effective control measures. Cabbage butterflies lay their eggs on the underside of cabbage leaves. After a few days, the eggs hatch into small green caterpillars, which are the cabbage worms. These worms feed voraciously on the cabbage plants, growing rapidly for about 2-3 weeks before entering the pupal stage, cocooning themselves to undergo metamorphosis.

Signs of Cabbage Worm Infestation

If you notice irregularly shaped holes in the leaves of your cabbage plants, chances are you have a cabbage worm infestation. These worms feed on the leaves and can quickly skeletonize the foliage if not controlled. Droppings, called frass, can also be a sign of their presence. Additionally, if you observe white butterflies fluttering around your garden, it is a clear indication of potential cabbage worm activity.

Prevention Strategies

Prevention is always better than cure when it comes to pests. Here are some strategies to prevent cabbage worm infestations:

Choosing Resistant Varieties

Opt for cabbage varieties that possess natural resistance to cabbage worms. These varieties have been bred to ward off pests and can significantly reduce the chances of infestation.

Implementing Crop Rotation

Cabbage worms overwinter in the soil, so rotating your crops annually can disrupt their life cycle. Avoid planting cabbage or other cruciferous vegetables in the same spot for consecutive years. This helps to reduce the population of cabbage worms.

Providing Adequate Nutrition

Ensure your cabbage plants are healthy and strong by providing them with proper nutrition. Well-fed plants are more resistant to pests and can withstand damage better than weak plants.

Organic Methods to Control Cabbage Worms

If prevention strategies fail, there are several organic methods available to control cabbage worms:


Inspect your cabbage plants regularly and handpick any visible cabbage worms. Drop them into a bucket of soapy water to prevent them from returning to the plants.

Introducing Bacillus thuringiensis (Bt)

Bt is a naturally occurring soil bacteria that produces toxins lethal to cabbage worms when ingested. Apply Bt-based insecticides according to the instructions to protect your plants without harming beneficial insects.

Using Neem Oil

Neem oil is a natural pesticide derived from the seeds of the neem tree. It acts as a repellent and disrupts the feeding and reproduction of cabbage worms. Dilute the neem oil according to the instructions and spray it on your plants.

Chemical Options for Controlling Cabbage Worms

In extreme cases or for commercial growers, chemical options can be considered. However, it is crucial to exercise caution and follow the instructions carefully to minimize harm to the environment and beneficial insects.

Synthetic Insecticides

There are synthetic insecticides available on the market specifically formulated to target and kill cabbage worms. These are potent chemicals, so it is important to use them sparingly and only as a last resort.

Systemic Insecticides

Systemic insecticides are applied to the soil or absorbed by the plant, making them toxic to insects that feed on the plant. These insecticides provide long-term protection against cabbage worms.

Companion Planting to Deter Cabbage Worms

Companion planting involves the strategic placement of plants to enhance growth or deter pests. Here are some companion plants that can help deter cabbage worms:


Nasturtiums are known to repel cabbage worms with their pungent scent. Plant them near your cabbage to create a natural deterrent.


Mint plants emit an odor that repels cabbage worms. Plant mint as a border around your cabbage patch to deter these pests.

Attracting Beneficial Insects

Encouraging beneficial insects, such as ladybugs, lacewings, and parasitic wasps, can help control cabbage worms naturally. You can attract these insects by planting flowers that provide nectar or pollen, such as marigolds and alyssums.

Integrated Pest Management for Cabbage Worm Control

Integrated Pest Management (IPM) is a holistic approach that combines multiple pest control methods to manage cabbage worm populations effectively. It involves regular monitoring, practicing preventive measures, and using a combination of biological, cultural, and chemical controls when necessary.

Natural Predators of Cabbage Worms

Several natural predators feed on cabbage worms and can contribute to population control. Birds, spiders, ground beetles, and parasitic wasps are among the beneficial creatures that prey on cabbage worms. Encouraging a diverse ecosystem in your garden can attract these predators and help keep cabbage worms in check.

Non-Chemical Interventions for Cabbage Worms

There are various non-chemical interventions you can employ to deter cabbage worms:

DIY Repellent Sprays

Create homemade sprays using natural ingredients like garlic, chili peppers, or soap to repel cabbage worms. These sprays can be applied directly to the foliage.

Floating Row Covers

Placing lightweight row covers over your cabbage plants can create a physical barrier that prevents cabbage butterflies from laying eggs. Ensure the covers are securely anchored to prevent any gaps.

Physical Barriers to Protect Cabbage Plants

Physical barriers can be effective in safeguarding your cabbage plants:


Place collars made of cardboard or plastic cups around the stems of young cabbage plants to prevent cabbage worms from crawling up.


Enclose your cabbage patch with netting to create a barrier that keeps out cabbage butterflies and other pests.

Importance of Crop Rotation

Crop rotation is an essential practice in pest control. By rotating your crops annually, you disrupt the life cycles of pests like cabbage worms. Make sure to avoid planting cabbage or other cruciferous vegetables in the same area for at least three years to minimize the risk of reinfestation.

Harvesting and Disposing of Affected Plants

If your cabbage plants are severely infested with cabbage worms, it may be necessary to remove and dispose of them to prevent further spread. Seal the affected plants in a plastic bag and dispose of them in the trash or bury them away from the garden area to avoid attracting pests.


Cabbage worms can be a formidable adversary for cabbage growers, but with the right knowledge and techniques, they can be effectively controlled. By deploying preventive measures, integrating natural strategies, and resorting to chemical options sparingly, you can protect your cabbage plants and enjoy a bountiful harvest. Remember to always maintain a balance in your garden ecosystem, allowing beneficial insects to thrive and aid in pest control. Ensure you stay vigilant, monitor your plants regularly, and take prompt action to keep these pests at bay, maintaining a healthy and productive vegetable garden.

Filed under

More Pests

You might also like

  • How to grow Damsons

    Welcoming you to the world of growing Damsons, this article aims to provide you with all the information you need to successfully cultivate these delicious fruits in your backyard or garden

  • How to grow Lychees

    Lychees are delicious and tropical fruits that are highly sought after for their unique flavor and juicy texture

  • How to grow Passionfruits

    Passionfruit is a delicious tropical fruit that is enjoyed by many for its unique flavor and versatility

  • How to grow Chinese Evergreens

    Chinese Evergreens (Aglaonema) are popular indoor plants known for their vibrant foliage and ability to thrive in low light conditions

Gardening jobs for May

Read our checklist of gardening tasks to do in your garden this May →.

Daily gardening tips: day 144

Use cardboard or newspaper under mulch to suppress weeds