Udea decrepitalis is a moth of the family Crambidae described by Gottlieb August Wilhelm Herrich-Schäffer in 1848. It is found in most of Europe (except Iceland, Ireland, the Iberian Peninsula, the Benelux, Denmark, Greece, Bulgaria, Croatia, Hungary and Ukraine), east into Russia.
| Udea decrepitalis | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Crambidae |
| Genus: | Udea |
| Species: | U. decrepitalis
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| Binomial name | |
| Udea decrepitalis (Herrich-Schäffer, 1848)
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| Synonyms | |
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The wingspan is 23–27 mm. Adults are on wing from May to July.
The larvae feed on Dryopteris carthusiana.
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