Insecta, Homoptera, Aphididae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: this aphid is one of the most polyphagous species: it can feed on more than 200 plants, including beet, broad bean, horse bean, bean, potato, carrot, artichoke, tobacco as well as certain flower crops and ornamentals.
- Winter eggs are deposited in autumn on the bark of European spindle (Euonymus europea), guelder rose (Viburnum opulus) or mock orange (Philadelphus sp.). In March, fundatrices give birth to apterae whose progeny includes an increasing proportion of winged individuals (*) .
From May onwards, winged virginoparae colonize numerous secondary host plants, depositing apterous nymphs on the underside of leaves or at the tips of stems. Aphid colonies increase rapidly until mid-June (*) , then declining progressively due to the action of parasites and predators.
Winged sexuparae appear in autumn and return to primary hosts; fertilization and egg-laying occur during October.
- Several generations follow one another on Euonymus before alatae migrate to secondary host plants. Delayed migration and absence of infestations can be put down to cold. During the month following the initial infestation of the secondary host, aphid numbers increase rapidly. Such hosts remains heavily infested for about 6 weeks.
- Apterous virgins are able to overwinter in regions with mild climate, allowing the species to survive without sexual phase. Also, migration is not obligatory, the aphids being able to live on Euonymus throughout the year.
- Leaves of beet become swollen, roll and cease developing (*) . Roots develop imperfectly and sugar content is lower. Aphids also spread to inflorescences of seed plants and hamper seed formation. Honeydew is produced and sooty moulds develop on it.
- Aphids infest all parts of other plants but do not distort leaves. Growth is affected and flowers abort due to the action of toxic saliva.
- A. fabae is also a vector of certain virus diseases.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.