Are these bumps on my stems actually bugs?

Yes, wisteria scale insects look like small, stationary brown bumps on the bark.

Do I need to use harsh chemicals to kill these pests?

Usually not. Horticultural oil and insecticidal soaps are very effective and safer for the environment.

Japanese wisteria: pests, causes and fixes

Check these first

Examine the stems for small, raised bumps.
Check the tips of new growth for clusters of tiny insects.
Look for sticky residue on the leaves which often indicates a pest problem.

Likely causes

Wisteria scale
Most likely
How to tell: You see small, brown, bumpy growths on the stems that look like tiny shells.
What to do: Scrub the stems with a soft brush and soapy water to remove the insects. For heavy infestations, apply horticultural oil during the dormant season.
Aphids
Possible
How to tell: The new growth is curling and you see tiny green or black insects clustered on the tips.
What to do: Spray the affected areas with a strong stream of water to knock them off. If they persist, use an insecticidal soap once every 5 to 7 days.

Pests on other plants

Find out what's wrong with your japanese wisteria

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

Pests are a concern when you see stunted growth or yellowing leaves. A few insects are normal, but a full infestation requires immediate action.

Stopping it coming back

Regularly inspect your plant during the growing season and keep it healthy with proper watering and sunlight.

Japanese wisteria: pests? Check yours with a photo

Every plant is a little different. Take a photo of your japanese wisteria and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Are these bumps on my stems actually bugs?: Yes, wisteria scale insects look like small, stationary brown bumps on the bark.
Do I need to use harsh chemicals to kill these pests?: Usually not. Horticultural oil and insecticidal soaps are very effective and safer for the environment.

What are these pests on my Japanese wisteria?

Check these first

Likely causes

Wisteria scale

Aphids

Find out what's wrong with your japanese wisteria

When to worry

Stopping it coming back

Japanese wisteria: pests? Check yours with a photo

Questions people ask

Guides to these causes

More problems with Japanese wisteria