Holes chewed through your kale leaves point to cabbage worms, which you can spot as small green caterpillars hiding on the undersides of the foliage. If you are asking “what is eating my kale leaves,” the answer is usually one of a few common garden pests that find kale as delicious as you do. The good news is that once you identify the culprit, you can take fast action to save your crop.
Kale is a hardy plant, but its leaves are a magnet for insects. You might notice tiny holes, large ragged chunks, or even whole leaves stripped down to the stem. Different pests leave different damage patterns, so looking closely at the leaf and the plant itself will help you solve the mystery. Let’s walk through the usual suspects and the best ways to stop them.
What Is Eating My Kale Leaves
Before you can treat the problem, you need to know which pest is responsible. The most common kale eaters are caterpillars, aphids, and beetles. Each leaves a unique signature on your plants, and each requires a slightly different control method. Take a few minutes to inspect your kale in the morning or evening when these pests are most active.
Look under the leaves, along the stems, and in the crown of the plant. You might see eggs, tiny droppings (called frass), or the insects themselves. A quick identification now will save you from guessing and wasting time on the wrong treatment.
Common Culprits Behind Holey Kale Leaves
Cabbage worms are the number one suspect. These are the larvae of the white cabbage butterfly, and they are small, velvety green caterpillars. They blend in perfectly with kale leaves, so you have to look carefully. You will often see their dark green or black droppings on the leaves, which is a clear clue they are feeding.
Another frequent pest is the cabbage looper. These caterpillars are also green but they move like inchworms, arching their backs as they crawl. They tend to chew large, irregular holes in the middle of the leaf rather than from the edges. If you see ragged holes that don’t start at the leaf margin, suspect loopers.
Aphids are tiny, soft-bodied insects that cluster on the undersides of leaves and on new growth. They suck the sap out of the plant, causing leaves to curl, yellow, and become sticky. While they don’t chew holes, their damage can look like distorted, unhealthy foliage that you might mistake for something else.
Flea beetles are small, shiny black or bronze beetles that jump when disturbed. They create many tiny, shot-hole pits across the leaf surface. If your kale looks like it was peppered with buckshot, flea beetles are your likely culprit.
How To Identify The Pest By Damage Type
Match the damage you see to the list below. This will help you narrow down the problem quickly and choose the right fix.
- Large, ragged holes from the edges inward: Cabbage worms or cabbage loopers.
- Tiny, scattered holes across the leaf: Flea beetles.
- Curled, yellowing, or sticky leaves: Aphids.
- Leaves skeletonized (only veins left): Slugs or snails, especially at night.
- Webbing or rolled leaves: Cabbage webworms or diamondback moth larvae.
If you see the pests themselves, that is the best confirmation. Cabbage worms are smooth and slow-moving. Loopers have a distinctive looping gait. Aphids are often in groups and can be green, black, or gray. Flea beetles are tiny and jump away when you touch the leaf.
How To Get Rid Of Cabbage Worms Naturally
Once you have confirmed cabbage worms, you can act immediately. Handpicking is the most direct method. Check your kale every day, especially the undersides of leaves. Drop any worms you find into a bucket of soapy water to kill them.
You can also use floating row covers. These lightweight fabric covers block the adult butterflies from laying eggs on your plants. Place them over your kale right after planting and secure the edges with soil or clips. This is a simple, chemical-free prevention that works very well.
Another option is to spray with Bacillus thuringiensis (Bt). This is a natural bacteria that only affects caterpillars. It is safe for people, pets, and beneficial insects. Mix it according to the label directions and spray the leaves thoroughly, especially the undersides. The worms will stop eating within a few hours and die in a couple of days.
How To Control Aphids On Kale
Aphids can multiply quickly, so early action is key. A strong blast of water from your hose can knock them off the plant. Do this in the morning so the leaves dry out during the day, which reduces the risk of fungal diseases.
For heavier infestations, spray with insecticidal soap or neem oil. These products suffocate the aphids without harming the plant. Be sure to coat the undersides of the leaves where aphids hide. You may need to repeat the spray every few days until the population is gone.
Encourage natural predators like ladybugs and lacewings. You can attract them by planting dill, fennel, or yarrow nearby. These beneficial insects feed on aphids and can keep the population in check without any effort on your part.
Dealing With Flea Beetles And Slugs
Flea beetles are most active in warm, dry weather. You can trap them using sticky cards placed near your kale. You can also apply a layer of diatomaceous earth around the base of the plants. This sharp powder cuts the beetles’ bodies and dehydrates them, but it must be reapplied after rain.
Slugs and snails are nocturnal feeders. If you suspect them, go out at night with a flashlight and check the leaves and soil. You can set up traps using shallow dishes of beer buried at soil level. The slugs will crawl in and drown. You can also create barriers with crushed eggshells or copper tape around your plants.
Preventative Measures For Future Kale Crops
Prevention is always easier than treatment. Start by rotating your crops each year. Do not plant kale in the same spot where other brassicas (cabbage, broccoli, cauliflower) grew the previous season. This breaks the pest life cycle.
Keep your garden clean. Remove fallen leaves and debris where pests can hide. Weed regularly, as many pests live on common weeds like wild mustard and shepherd’s purse. At the end of the season, pull up old kale plants and compost them or dispose of them properly.
Consider companion planting. Strong-smelling herbs like thyme, sage, and rosemary can confuse pests and deter them from finding your kale. Planting marigolds nearby can also help repel aphids and other insects.
When To Use Chemical Pesticides
Most home gardeners can manage kale pests with natural methods. However, if an infestation is severe and nothing else works, you can use a chemical pesticide. Look for one that is labeled for edible crops and safe for vegetables. Always follow the instructions on the label and observe the waiting period between spraying and harvest.
Use chemicals as a last resort. They can harm beneficial insects like bees and ladybugs. They can also create resistance in pest populations over time. If you do spray, do it in the evening when bees are less active.
How To Protect Kale From Future Damage
After you have dealt with the current pests, keep monitoring your plants. Check them every few days for new signs of damage. Early detection makes control much easier. A quick daily inspection takes only a minute but can save your entire crop.
You can also interplant kale with other vegetables. For example, planting onions or garlic near kale can mask the scent that attracts pests. This simple trick can reduce the number of insects that find your plants.
If you are growing kale in containers, you have more control. You can move the pots to a new location if pests become a problem. You can also use fresh potting soil each season to avoid soil-borne pests.
Frequently Asked Questions About Kale Pests
Can I Eat Kale Leaves That Have Holes In Them?
Yes, you can eat kale leaves with holes as long as you wash them thoroughly. The holes are cosmetic damage and do not make the leaves unsafe. Just be sure to rinse off any insects or droppings before eating.
What Is The Fastest Way To Get Rid Of Cabbage Worms?
The fastest way is to handpick them off the plants and drop them in soapy water. This gives immediate results. For a larger infestation, applying Bt spray will kill them within a couple of days.
Why Are My Kale Leaves Turning Yellow?
Yellowing leaves can be caused by aphids sucking sap, or by nutrient deficiencies. Check the undersides of the leaves for aphids. If you don’t see any, the plant may need more nitrogen or water.
Are Coffee Grounds Effective Against Kale Pests?
Coffee grounds can help deter slugs and snails, but they are not very effective against caterpillars or aphids. They can also add nitrogen to the soil as they decompose, which is a bonus for kale growth.
Will Kale Regrow After Being Eaten By Pests?
Yes, kale is very resilient. If the roots and the central growing point are intact, the plant will regrow new leaves. Remove the damaged leaves and give the plant water and nutrients to encourage new growth.
Final Steps To Save Your Kale
Now that you know what is eating your kale leaves, you can take action right away. Start by inspecting your plants daily and identifying the specific pest. Then apply the appropriate control method, whether that is handpicking, row covers, or a natural spray.
Remember that a healthy kale plant is more resistant to pests. Water consistently, feed with a balanced fertilizer, and keep the area clean. With a little effort, you can enjoy a bountiful harvest of undamaged, nutritious kale leaves.
Do not get discouraged if you lose a few leaves to pests. It happens to every gardener. The key is to stay observant and act quickly when you notice a problem. Your kale will thank you with fresh, tender leaves all season long.
If you have tried everything and the pests persist, consider asking a local garden center for advice. They can recommend products specific to your region and pest pressure. Sometimes a fresh perspective helps you spot something you missed.
Keep a garden journal to note when pests appear each year. This will help you anticipate problems and apply prevention earlier next season. Over time, you will develop a system that works for your unique garden environment.
Finally, share your knowledge with other gardeners. The more people who know how to identify and control kale pests, the healthier our gardens will be. Now go out there and check your kale. You have the tools and the knowledge to protect it.