Description, Biology, Life Cycle, Damage, Common Names, Images
- A species having apple as primary host and Gramineae as secondary hosts.
- Winter eggs are laid on apple, being scattered over old wood and not clustered together as in Aphis pomi .
- Fundatrices give rise to apterous virginoparae (fundatrigeniae) in spring.
Soon after flowering, 2nd-generation alatae leave the trees and move on to the roots of numerous species of Gramineae. In autumn, winged males and sexuparae, which will later produce apterous sexual females, undertake a return migration to apple and preferably spread to the underside of old leaves (they never move to young shoots).
- On average, there are 8 to 9 generations annualy. Dense colonies are present on apple in the spring and the autumn but never in the summer.
- This species most commonly attacks old apple trees (*) ; it is generally not very harmful.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.