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Sticker of Clover hayworm moth
Bug card No. 0938 of 4,939

Clover hayworm moth

Hypsopygia costalis

The clover hayworm moth is a small purple moth with bright yellow lines and spots on its wings. Its caterpillars have a strange taste: they eat dry, old plant matter. They are often found living in haystacks.

Lives in
Europe
Wingspan
1.6 to 2.3 cm (0.63 to 0.91 in)
Top speed
about 11 km/h (6.8 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless to people. Its caterpillars can spoil stored hay.
What does it eat?
Its caterpillars eat dry plant material, such as hay and thatch, especially clover hay.
For real!Photo of Clover hayworm moth
Picture by Ben Sale from UK. CC BY 2.0, via Wikimedia Commons.

How big is it?

How wide are its wings?

Clover hayworm moth wings about 2.3 cm tip to tip (0.91 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)
wings as wide as 4 grains of rice in a rowcould fly across a whole football pitch in 34 seconds

How big is Clover hayworm moth compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its caterpillars have even been found in the nests of chickens and magpies.

2

They like damp, squashed hay at the bottom of haystacks best.

3

Farmers keep hay dry and airy to stop the caterpillars from moving in.

4

The moths fly from May to July.

you asked

Most asked questions about Clover hayworm moth

?What does the clover hayworm eat?

Its caterpillars eat dry plant matter like hay, especially clover hay.

?How do you keep clover hayworms out of hay?

Keep the hay dry and well aired, because they like damp, matted hay.

For bug experts

Scientific name
Hypsopygia costalis
Named by
Fabricius, 1775
Group
Moths
Family
Pyralidae
Classification
Insecta > Lepidoptera > Pyralidae
Lives on
Europe
Also known as
Gold triangle, Clover hay moth

Where the facts come from

  1. Hypsopygia costalis (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. 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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