Are these bugs going to kill my plant?

Lace bugs rarely kill a healthy rhododendron, but they can make it look very unattractive and reduce its vigor. It is best to treat them as soon as you spot them.

Do I need to use harsh chemicals?

No, insecticidal soaps and horticultural oils are usually very effective and much safer for the environment. Always follow the label instructions.

What are the bugs on my rhododendron?

Check these first

Look at the undersides of the leaves with a magnifying glass.
Check for fine webbing between the stems.
See if the leaves have a stippled or speckled look.

Likely causes

Lace bugs
Most likely
How to tell: The leaves look stippled or bleached on top with tiny black spots on the underside. These bugs suck the sap and leave the foliage looking sickly.
What to do: Use a strong stream of water to wash the undersides of the leaves. If the infestation is heavy, apply insecticidal soap or horticultural oil every 7 to 10 days.
Spider mites
Possible
How to tell: You might see fine webbing between leaves or stems and a dusty appearance on the foliage. The leaves may turn yellow or bronze over time.
What to do: Increase humidity around the plant and wash the leaves with water. Use neem oil if the population persists.

When to worry

Treat the plant if you see visible damage or a large number of insects. A few bugs are usually manageable, but a heavy infestation can weaken the plant significantly.

Stopping it coming back

Keep the plant healthy with proper watering and mulch, as stressed plants are more attractive to pests.

Not sure which one it is? Photograph your rhododendron.

This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Are these bugs going to kill my plant?: Lace bugs rarely kill a healthy rhododendron, but they can make it look very unattractive and reduce its vigor. It is best to treat them as soon as you spot them.
Do I need to use harsh chemicals?: No, insecticidal soaps and horticultural oils are usually very effective and much safer for the environment. Always follow the label instructions.