What pests attack napa cabbage?

Cabbage moth, Cabbage root fly, Cabbage white caterpillars, Diamondback moth, Flea beetles

What diseases affect napa cabbage?

Bacterial soft rot, Clubroot, White mould (Sclerotinia)

Napa cabbage pests and diseases: how to recognise them

Q: Which napa cabbage problems need quick action?

Cabbage moth: Holes in the outer leaves and dark droppings on the plants. Bacterial soft rot: Potato stems may turn black and rot from the base upwards (blackleg). Clubroot: Growth and yield are badly reduced, and severely affected plants may die. White mould (Sclerotinia): Roots, heads, pods and fruit can rot too, also in storage.

Brassica rapa

The pests, diseases and disorders recorded for napa cabbage in our library, each with a photo and its first symptom. Every page has the full list of symptoms, organic and chemical treatment and prevention.

At a glance

Problems in total	8
Pests	5
Diseases	3
Need quick action	4

How to grow napa cabbage · All pests and diseases

Pests

Cabbage mothHoles in the outer leaves and dark droppings on the plants.Photo: picture taken by Olaf Leillinger, CC BY-SA 2.5, Wikimedia Commons
Cabbage root flyOccasionally the maggots tunnel into Brussels sprout buttons.Also called: cabbage maggot, cabbage flyPhoto: James K. Lindsey, CC BY-SA 3.0, Wikimedia Commons
Cabbage white caterpillarsSmall white caterpillars bore into cabbage hearts, so damage also shows inside when the head is cut.Also called: large white, cabbage butterflyPhoto: Schlaghecken Josef, CC BY 4.0, Wikimedia Commons
Diamondback mothOlder caterpillars chew small holes and attack growing points, flower buds and broccoli or cauliflower heads, which can stunt young plants.Photo: Please report references to olei@despammed.com ., CC BY-SA 2.5, Wikimedia Commons
Flea beetlesOn potatoes the larvae can bore narrow tunnels in the tubers.Photo: Bob Peterson from North Palm Beach, Florida, Planet Earth!, CC BY-SA 2.0, Wikimedia Commons

Diseases

Which napa cabbage problems need quick action?

These spread or do lasting harm fast; check the plants and start treatment the day you see them.

Cabbage moth: Smooth caterpillars without obvious hairs, yellowish green to brownish green or almost black, growing to 40–50 mm.
Bacterial soft rot: Small water-soaked spots that quickly enlarge, sink and turn soft and mushy; the tissue underneath is cream to black.
Clubroot: Stunted growth, purplish leaves and wilting in hot weather; wilted plants may recover for a while when it is cooler.
White mould (Sclerotinia): A soft, wet rot on stems, often near soil level; plants suddenly turn yellow, wilt and collapse.

Plants with many of the same problems

Which plants each problem affects: sources

The links between these problems and the plant were checked against these pages.