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Sticker of Lawn armyworm moth
Bug card No. 2553 of 4,939

Lawn armyworm moth

Spodoptera mauritia
Eats: PlantsMothsGardens and meadows6 legs

The lawn armyworm moth is a plain grey brown moth. Its caterpillars are famous because they march through fields in huge groups, like a little army. They can eat a whole rice field in just a few days.

Lives in
From the Red Sea across India and Southeast Asia to Australia and the Pacific Islands
Wingspan
4 cm (1.6 in)
Top speed
about 14 km/h (8.7 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless to people, but its caterpillars can be a big problem for farmers.
What does it eat?
Its caterpillars eat grasses, especially rice and wheat, and sometimes trees too.
For real!Photo of Lawn armyworm moth
Picture by Richard Fuller. CC0, via Wikimedia Commons.

How big is it?

How wide are its wings?

Lawn armyworm moth wings about 4 cm tip to tip (1.6 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)
wings as wide as 7 grains of rice in a rowcould fly across a whole football pitch in 27 seconds

How big is Lawn armyworm moth compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Farmers sometimes bring bolas spiders to their fields. These spiders give off a smell like a female moth and catch the male moths that come looking.

2

It lives on many Pacific islands, including Hawaii, Fiji and Samoa.

3

Bats eat these moths. Scientists found them in the droppings of a bat.

4

In the past, swarms of its caterpillars destroyed huge rice fields in Malaysia, Sri Lanka and India.

you asked

Most asked questions about Lawn armyworm moth

?Why is it called an armyworm?

Because its caterpillars move through fields in huge groups, like an army.

?What do lawn armyworms eat?

Grasses, especially rice, wheat and lawn grass.

For bug experts

Scientific name
Spodoptera mauritia
Named by
Boisduval, 1833
Group
Moths
Family
Noctuidae
Classification
Insecta > Lepidoptera > Noctuidae
Lives on
Africa, Asia, Australia and Oceania
Also known as
Lawn armyworm, Paddy swarming caterpillar

Where the facts come from

  1. Spodoptera mauritia (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 Richard Fuller. CC0, 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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