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Arge pagana · juodasis erškėtinis pjūklelis
- large rose sawfly
- Blauschwarze Rosenbürstenhornwespe
- Kaunomailapistiäinen
- juodasis erškėtinis pjūklelis
- obnażacz kopciuszek
Its eggs are laid on roses hence the name "large rose sawfly". Arge pagana can reach a length of about 1 cm. Wings and veins on the wings are black, often with blue metallic sheen. Pronotum and legs are also black. Its most conspicuous feature is a large rounded yellow abdomen. It has a black head and thorax and the legs are largely black. Larvae reach about 25 mm and are pale green with black dots and a yellow head. The eggs are laid on roses. Larvae appear in early summer and reach full size by the end of July. The larvae are gregarious and live in colonies feeding on rose leaves (Rosa species, Rosa acicularis). The pupal period is very short. Adults feed on nectar and pollen from Tanacetum vulgare, Heracleum sphondylium. During the warmer years there may be two or, rarely, three generations.
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