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Some farming ant species gather and store the aphid eggs in their nests over the winter. In the spring, the ants carry the newly hatched aphids back to the plants. Some species of dairying ants (such as the European yellow meadow ant, Lasius flavus) [70] manage large herds of aphids that feed on roots of plants in the ant colony. Queens leaving ...
The galls occur when female aphids lay a single egg on the underside of the sumac leaf, inducing the leaf to form a sac over the egg. [5] According to Hebert et al, the eggs "give rise to a series of parthenogenetic generations, which remain within the gall. Winged females leave the gall in late summer and fly to moss, where they establish ...
The eggs are green but are difficult to differentiate between other species of aphid eggs. [2] Eggs are laid on branches and will typically hatch before other aphid species. As a nymph, R. oxyacanthae appears dark green with short cornicles at the end of its abdomen. [2] The nymphs will feed on the leaves of the host, and on the flower buds. [6]
The primary host plants are woody shrubs, and eggs are laid on these by winged females in the autumn. The adults then die and the eggs overwinter. The aphids that hatch from these eggs in the spring are wingless females known as stem mothers. These are able to reproduce asexually, giving birth to live offspring, nymphs, through parthenogenesis. [7]
Woolly aphids generally are not much cause for alarm, although they can cause rather unsightly damage to plants, which is particularly a problem for growers of ornamental plants. Symptoms caused by their feeding on a plant include twisted and curled leaves, yellowed foliage, poor plant growth, low plant vigor, and branch dieback. [citation needed]
Stalked eggs of unknown species, Mainzer Sand (Rhineland-Palatinate, Germany) Larva of a species in the Chrysoperla carnea group feeding on an aphid. Eggs are deposited at night, singly or in small groups; one female produces some 100–200 eggs. Eggs are placed on plants, usually where aphids are present nearby in numbers. Each egg is hung on ...
The first generation of the year is composed entirely of female fundatrices (also called stem mothers), which hatch from winter eggs laid on the bark of witch-hazel. Shortly following bud break, she begins to feed on leaf tissue. She then repeatedly “stings” the abaxial surface of the leaf to induce gall formation.
Aphids do best when amino acids are actively translocated in the phloem. In spring, the leaves grow and import amino acids via the phloem; in summer leaves are mature and export mainly sugars. In autumn, the leaves senesce and export amino acids and other nutrients. Thus on trees the leaves are most suitable for aphids in spring and autumn.
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