Pest Lexicon – Green Guardia

Cabbage White Butterflies: Recognizing Caterpillars on Cabbage & Preventing Naturally

Cabbage white butterflies are typical pests in the vegetable patch: The moths lay eggs on cabbage plants, from which caterpillars hatch that can severely damage leaves in a short time. Here you will learn how to recognize eggs, caterpillars, and feeding damage, and how to protect your cabbage naturally.

ⓘPieris brassicae / Pieris rapae #Cabbage white caterpillar · Holes in cabbage leaves

What are cabbage white butterflies?

Cabbage white butterflies are white moths that are very common in the garden. The caterpillars are the problem: they feed on cabbage leaves and can quickly cause significant damage, especially to young plants and dense crops. We often distinguish between the Large White and the Small White – both can infest cabbage plants.

Caterpillars eat leaves Eggs on leaf undersides multiple generations possible

Important note: Not every hole in a cabbage leaf comes from a cabbage white butterfly. Flea beetles, slugs, or other caterpillars can look similar. For a reliable identification, it is worth looking for eggs/caterpillars and droppings.

How to recognize eggs, caterpillars & infestation

Eggs: yellowish, often in groups (especially Large White), usually on leaf undersides
Caterpillars: greenish (depending on species), often well camouflaged; the Large White often in groups
Droppings: small dark crumbs on leaves or in leaf axils
Feeding pattern: holes, frayed leaf edges, sometimes “skeletonized” leaves

Green Guardia Tip: It is best to check cabbage 2–3 times per week. If you remove eggs early, you prevent many caterpillars all at once.

Typical damage to cabbage

round to irregular holes in leaves
severe leaf consumption leading to "bare stalks" in young plants
feeding inside cabbage heads (if discovered late)
soiled leaves due to caterpillar droppings

Which plants are affected?

White cabbage, red cabbage, savoy cabbage
Broccoli, cauliflower, Romanesco
Kohlrabi, bok choy, Chinese cabbage
also arugula and other brassicas

Why does an infestation occur?

Moth activity in warm weather
unprotected cabbage plants (without netting)
dense stands provide shelter for caterpillars
low presence of beneficial insects in the garden (lack of diversity)

What to do in case of infestation? (natural & sensible)

1. Immediate measures

Wipe off/remove eggs from leaf undersides
Collect caterpillars by hand (morning/evening)
Specifically remove heavily infested leaves

2. Protective nets

Cover cabbage early with insect protection netting
Close the net tightly (also at the edges)
Check regularly: caterpillars can also hatch under the net if eggs were already present

3. Improve garden conditions

do not plant too densely (better control and air circulation)
promote flowering plants (attract beneficial insects)
maintain crop rotation (change beds)

Beneficial insects: Parasitic wasps as natural support

As a natural adversary of cabbage white butterflies, parasitic wasps (Trichogramma species) are suitable, as they parasitize the eggs of butterflies. This can help to interrupt the development cycle – especially if you check regularly and use nets in addition.

Why parasitic wasps are useful: They target the root cause (the eggs), are very small, harmless to humans, and support natural regulation in the garden.

FAQ about cabbage white butterflies

How quickly do caterpillars strip cabbage bare?

In warm weather and with many caterpillars, very quickly – especially with young plants. Regular inspection is therefore crucial.

Where is the best place to find the eggs?

Usually on the underside of the leaf, often near the leaf veins. In the case of the Large White, frequently in groups.

Does a net really help?

Yes – it is one of the most reliable preventative measures. It is important that the net is put on in time and closes tightly everywhere.

What is the most important first step in case of infestation?

Remove eggs and caterpillars, then protect with a net. The sooner you intervene, the less damage occurs.