Insecta, Homoptera, Aphididae .
Description, Biology, Life Cycle, Damage, Common Names, Images
A heteroecious species with pear as primary host and Galium (Galium mollugo, G. aparine, G. sylvaticum) as secondary host.
- Winter eggs are deposited in crevices in the scars of the petioles of fruits and hatch in late March. Young fundatrices penetrate into the buds which have just opened, and fundatrigeniae colonize the foliage.
- 3-7 generations succeed one another on pear. Alatae emerge from the 3rd generation onwards and enventually breed on Galium. Apterous migrants are attended by several species of ants, which protect them from predators such as ladybirds, hoverflies and various hymenopterous insects. Winged sexuparae appear in early September and return to pear.
- Affected leaves undergo severe transverse curling, rapidly becoming yellowish-green in colour (*) . Aphids produce considerable quantities of honeydew, thus causing a scorching of leaves which, moreover, become covered with sooty moulds. Growth is suddenly interrupted.
- In addition, curled leaves attract the pear psylla (Cacopsylla pyri).
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.