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.
Onion Thrips
Fine white stippled scars run in vertical lines along the leaf surface, and the whole leaf eventually turns whitish. Growth stops and both yield and quality suffer.
How to identify and treat: Onion ThripsThrips
Silvery white to brown scarring spreads over leaf and fruit surfaces. Flowers discolor and drop, and fruit is left with keloid-like scar tissue.
How to identify and treat: ThripsLeek Moth
White grazed scars and small holes line the leaf surface, and splitting the leaf reveals larvae inside. Damaged leaves snap easily and die back.
How to identify and treat: Leek MothOther possible causes
- Seedcorn Maggot — Emergence is uneven, and digging up seed reveals white maggots inside the seed or hypocoty…
- Root-knot Nematode — The plant wilts in the daytime and does not recover with feeding or watering. Pull it up a…
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what onion 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.