Gadenin日本語Get the appCheck these first
- What shape is the damage: round holes, only veins left, white trails, or a pale stippling?
- Where are the insects or droppings: under the leaves, on new shoots, or at the base?
- If nothing is visible by day, check at night or early morning for cutworms and slugs.
Most likely causes
From the pests and diseases recorded for this plant, the ones whose symptoms match, most serious first. Symptoms alone rarely confirm a cause, so use the linked page to check the signs and treatment.
Cabbage Armyworm
Young larvae feed in groups on the leaf underside, eating only the tissue so the leaf turns translucent white. Larger larvae chew big holes and can strip a plant bare in a single night.
General description; not specific to this plant.
How to identify and treat: Cabbage ArmywormCabbage White Caterpillar
Irregular holes appear in the leaves and eventually only the veins remain. Dark green pellets of frass are conspicuous at the crown and on leaf undersides.
General description; not specific to this plant.
How to identify and treat: Cabbage White CaterpillarDiamondback Moth
Larvae graze the leaf tissue from below, leaving the upper skin as white window-like patches. As they grow they chew many small holes and also attack the growing point.
General description; not specific to this plant.
How to identify and treat: Diamondback MothOther possible causes
- Cutworms — Typically a newly transplanted seedling is severed at soil level and found toppled the nex…
- Slugs — Irregular holes are chewed in leaves and fruit with glistening slime trails nearby. By day…
- Root-knot Nematode — The plant wilts in the daytime and does not recover with feeding or watering. Pull it up a…
- Root-lesion Nematode — Elongated blackish brown necrotic lesions form on the root surface and fine roots rot away…
- Onion Thrips — Fine white stippled scars run in vertical lines along the leaf surface, and the whole leaf…
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what napa cabbage pests and bug damage is and what to try. What it cannot tell you is what actually happened to someone who had it on the same plant, at the same point in the season, and what they did next.
Gadenin is a free garden journal built around that. You photograph the plant, tag what you are seeing, and the entries line up by date for each plant you grow.
- Tag the problem and the app tells you how many other growers have logged the same thing on the same plant.
- Growers who make their records public can be followed, so you can read what they did and how it turned out.
- Next season your own entries come back at the same point in the year, so you check the plant before it starts.
Free on iPhone. Recording, tagging and reading public records cost nothing.