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Sticker of Rice leaf-roller
Bug card No. 3631 of 4,939

Rice leaf-roller

Cnaphalocrocis medinalis
Eats: PlantsMothsGardens and meadows6 legs

The rice leaf-roller is a small straw-yellow moth with wavy lines on its wings. Its little green caterpillars fold rice leaves around themselves like a sleeping bag. Farmers keep a close eye on it, because it can harm rice fields.

Lives in
South and Southeast Asia and most of Australia
Length
7 to 9 mm (0.28 to 0.35 in)
Wingspan
1.3 to 1.8 cm (0.51 to 0.71 in)
Top speed
about 9.4 km/h (5.8 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless to people. It is only a problem for rice plants.
What does it eat?
Its caterpillars eat the green part of rice leaves, and also maize, wheat, sugarcane and sorghum.
For real!Photo of Rice leaf-roller
Picture by Nerdmaxxer. CC BY-SA 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Rice leaf-roller about 9 mm long (0.35 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)

How wide are its wings?

Rice leaf-roller wings about 1.8 cm tip to tip (0.71 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)
small enough to sit on your fingernailas long as 1.5 grains of rice in a rowcould fly across a whole football pitch in 40 secondsmoves 290 times its own body length every second

How big is Rice leaf-roller compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

The caterpillar spins silk to fold a leaf shut and then eats inside it, leaving the leaf whitish.

2

One mother moth can lay around 56 eggs, and they hatch after 4 to 8 days.

3

Its whole life, from egg to grown-up moth, takes about five weeks.

4

The caterpillar changes colour as it grows, from green to yellowish green to reddish brown.

5

It turns into a pupa inside a folded leaf, wrapped in a thin white cocoon.

you asked

Most asked questions about Rice leaf-roller

?Why is the rice leaf-roller a pest?

Its caterpillars fold and eat rice leaves, which makes the plants weaker and gives farmers less rice.

?How big is the rice leaf-roller?

The moth is only about 7 to 9 millimetres long, with wings up to about 1.8 centimetres across.

For bug experts

Scientific name
Cnaphalocrocis medinalis
Group
Moths
Family
Crambidae
Classification
Insecta > Lepidoptera > Crambidae
Lives on
Asia, Australia and Oceania
Also known as
Rice leafroller, Rice leaf folder

Where the facts come from

  1. Cnaphalocrocis medinalis (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 Nerdmaxxer. CC BY-SA 4.0, 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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