Arge ochropus

(Gmelin, 1790)

rose sawfly

Arge ochropus, commonly known as the rose , is a small sawfly in the Argidae. measure 7–10 mm in length and are active primarily in spring. The species is native to the Palearctic region and has been introduced to northeastern North America. Larvae feed on rose leaves, causing skeletonization damage, while adults consume nectar and pollen from several flowering plants. The species produces two annually in temperate regions.

Argidae - Arge ochropus by Hectonichus. Used under a CC BY-SA 3.0 license.Arge ochropus 150679645 by Michel Langeveld. Used under a CC BY-SA 4.0 license.Rose Sawfly Arge ochropus^ Argidae - Flickr - gailhampshire by gailhampshire from Cradley, Malvern, U.K. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Arge ochropus: /ˈɑːrdʒi ˈɒkrəpəs/

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Identification

Distinguished from the similar Athalia rosae (Tenthredinidae) by structure: Arge ochropus has three-segmented antennae with the third segment greatly elongated, whereas Athalia rosae has 10–11 antennal segments. Distinguished from Arge pagana by coloration: A. ochropus has reddish-orange and wings, while A. pagana is mainly black above.

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Habitat

Found in gardens, parks, and natural areas where roses (Rosa ) occur. frequent flowering plants including tansy, wild angelica, and hogweed.

Distribution

Native to Europe, Asia Minor, the Caucasus, Turkmenistan, Northern Iran, and Western Siberia to Lake Baikal. Introduced to the northeastern United States and Eastern Canada.

Seasonality

active from April to May. Two per year in temperate regions; larvae present in spring and again later in summer.

Diet

Larvae feed on leaves of Rosa including Rosa canina, Rosa majalis, and Rosa pimpinellifolia. feed on nectar and pollen of Tanacetum vulgare (tansy), Angelica sylvestris (wild angelica), and Heracleum sphondylium (hogweed).

Life Cycle

Females lay 16–18 on rose stems. Larvae develop through several instars, feeding on rose leaves. occurs in soil. Two complete per year in most of range. stage not explicitly documented in sources.

Behavior

Larvae feed gregariously on rose foliage, producing skeletonization damage by consuming tissue between leaf . visit flowers for nectar and pollen.

Ecological Role

Herbivore; larvae act as defoliators of wild and cultivated roses. Serves as prey for including ground beetles and lightning larvae.

Human Relevance

Considered a minor pest of ornamental roses in gardens. Larval feeding can cause significant aesthetic damage to rose foliage. Control through manual removal or targeted application of insecticidal soap or spinosad is effective.

Similar Taxa

  • Athalia rosaeSimilar appearance and shared rose-feeding habit; distinguished by 10–11 segmented versus three-segmented antennae in Arge ochropus
  • Arge paganaCongeneric with similar ; distinguished by predominantly black coloration versus reddish-orange and wings in Arge ochropus
  • Endelomyia aethiops (Roseslug sawfly)Another rose-feeding causing similar skeletonization damage; distinguished by different (Tenthredinidae) and larval
  • Allantus cinctus (Curled rose sawfly)Rose-feeding with similar damage ; distinguished by larval curling and different (Tenthredinidae)

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Sources and further reading