Description, Biology, Life Cycle, Damage, Common Names, Images
A heteroecious species having poplar (Populus italica, Populus nigra) as primary host and wild or cultivated Compositae, especially lettuce and chicory as secondary hosts.
- Adult: this aphid overwinters in the egg stage in the crevices of the bark of poplar. In the spring, fundatrices move to a petiole which they probe, thus causing the formation of a goatskin-shaped gall enclosing the young female (*) .
After 12 days, the latter reproduce, 100-250 winged fundatrigeniae appearing in a few weeks. Capable of reproducing immediately, these leave the gall and migrate to Compositae. They first infest the foliage and then multiply, giving rise to apterous virginoparae which colonize roots during the summer. In late summer, winged sexual forms emerge and migrate back to poplar where eggs will be laid.
- This aphid's life-cycle, which presents only one generation of fundatrigeniae, is characterized by the fact that individuals migrate rapidly to secondary hosts as early as June.
- Asexual reproduction on the secondary host sometimes occurs after the winged sexuparae have returned to poplar.
Roots become covered with a whitish waxy secretion (*) . Lettuce has difficulty forming a head, leaves become yellow and the plant may wilt and die.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.