Allantus viennensis

(Schrank, 1781)

Curled Rose Sawfly, Rose Sawfly

Allantus viennensis is a in the Tenthredinidae, commonly known as the curled rose sawfly. The larvae are significant pests of roses, feeding on leaf margins and causing defoliation. are small, -like insects with saw-like ovipositors used to insert into rose tissue. The is distinguished by the larval habit of curling cryptically on leaves when not feeding.

Allantus viennensis by (c) Иван Пристрем, some rights reserved (CC BY), uploaded by Иван Пристрем. Used under a CC-BY license.

Noordwijk - Allantus viennensis? by Rudolphous. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Allantus viennensis: /əˈlæntəs viˈɛnːɛnsɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Larvae resemble caterpillars but can be distinguished by having six or more pairs of (caterpillars have five or fewer) and the absence of on prolegs. Larvae characteristically curl tightly on leaf undersides or buds when not feeding, providing cryptic camouflage. are identified by their -like appearance and association with roses. Distinguished from roseslug sawfly (Endelomyia aethiops) by feeding pattern: A. viennensis consumes leaf margins while E. aethiops skeletonizes leaves between .

Images

Habitat

Gardens, nurseries, and landscapes where roses (Rosa spp.) are cultivated. Found in temperate regions with established rose plantings.

Distribution

Native to Europe; introduced to North America. Records from Belgium, Canada, and the United States. Established in regions with suitable rose .

Seasonality

emerge in spring when rose foliage returns. Larvae feed through May and June. Two per year in some regions: first generation completes development in early summer, second generation follows. Overwinters as immatures in soil beneath plants.

Diet

Larvae feed exclusively on rose leaves (Rosa spp.), consuming leaf margins and causing defoliation. do not feed; their mouthparts are not adapted for chewing plant material.

Host Associations

Rosa - Larvae feed on leaves of cultivated and wild roses

Life Cycle

are inserted into rose leaf tissue using the saw-like ovipositor. Larvae hatch and feed on leaf margins, curling cryptically when not active. Upon completing development, larvae bore into rose twigs to pupate. emerge, mate, and initiate a second in favorable conditions. Overwinters as stages in soil beneath plants.

Behavior

Larvae exhibit cryptic , curling tightly on leaf undersides or buds when not feeding, blending with plant tissue. Gregarious larvae may display defensive posturing when disturbed, arching backs and curling . are active fliers, seeking rose plants for oviposition.

Ecological Role

Herbivore that can significantly impact rose plant health through defoliation. Serves as prey for ground beetles, lightning larvae, and other . Contributes to nutrient cycling through leaf consumption and processing.

Human Relevance

Recognized pest of ornamental roses in gardens and commercial production. Damage can reduce aesthetic value and plant vigor. Managed through physical removal, water sprays, or OMRI-listed including insecticidal soap and spinosad. Not known to sting or bite humans.

Similar Taxa

Endelomyia aethiopsAlso called roseslug sawfly; larvae skeletonize leaves between rather than consuming margins, and have only one per year
Cladius pectinicornisBristley rose sawfly; larvae have distinctive bristle-like and different feeding patterns on rose foliage
Lepidoptera caterpillarsLarvae resemble caterpillars but differ in number (6+ vs. 5 or fewer) and absence of
Other Tenthredinidae sawfliesShare -like and plant-feeding larvae, but differ in association and larval