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Morphological characters

Apterous: 1.2-2.6 mm, pale yellow to glossy green, adult bears a horseshoe-shaped dorsal spot.
Alate: 1.6-2.4 mm, green, antennae longer than body, abdomen with a dark patch, cornicles straight and dark with a flange at tip, cauda dark.

See identification file

Life cycles

Exclusively anholocyclic.

Host plants

Highly polyphagous, A. circumflexum likes mild temperatures, particularly those found in greenhouses where it proliferates on numerous ornamental plants, including Senecio (ragworts), Fuschia and Cyclamen.
It also colonizes numerous families of plants: Fabaceae: Phaseolus (bean), Liliaceae: Allium (onion), Brassicaceae: Raphanus (radish), Apiaceae: Apium (celery), Solanaceae: Solanum tuberosum (potato).

Particular characteristics

Alate forms are rare.

Agronomic impact

A. (N.) circumflexum colonizes many crops grown under shelter.
It produces large quantities of honeydew which spoils the plants.
It is the vector of about 30 viruses that depend on the persistent mode (viruses of cereals or potatoes) and the non-persistent mode on numerous plants (such as bean, beet, cauliflower, celery or onion).

Natural enemies