Treble bar
The treble-bar is a grey moth with three dark bands across each front wing. It flies at night and comes to lights. Its caterpillar is an inchworm that loves one special plant, St John's wort.
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Fun facts
Its wings measure about 4 centimetres from tip to tip.
Some years it has one family of young, some years two. In Britain you can see the moths from May to September.
The caterpillar can be green or reddish brown, with light and dark stripes along its body.
It spends the winter as a tiny caterpillar and grows big the next year.
It looks so much like a close cousin that even experts find it hard to tell the two apart.
Most asked questions about Treble bar
?What does the treble-bar caterpillar eat?
It eats St John's wort, a meadow plant with yellow flowers.
?When can you see a treble-bar moth?
In Britain from May to September. It flies at night and likes to come to lights.
For bug experts
- Scientific name
- Aplocera plagiata
- Named by
- Linnaeus, 1758
- Group
- Moths
- Family
- Geometridae
- Classification
- Insecta > Lepidoptera > Geometridae
- Lives on
- Europe, Asia
- Also known as
- St. John's wort inchworm
Where the facts come from
- Treble-bar (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
- Picture by Ben Sale from UK. CC BY 2.0, Wikimedia Commons. The sticker of this bug is drawn from this picture.
If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.
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