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The eggs are laid in batches, each female laying several hundred. Female hoverflies lay several thousand eggs. The adults feed on pollen and nectar but the larvae feed voraciously on aphids; Eupeodes corollae adjusts the number of eggs laid to the size of the aphid colony. [91]
A single larvae will eat about 400 medium size aphids during its development to pupal stage. An adult will eat about 300 aphids before it lays its eggs. Approximately 3 to 10 aphids are eaten for each egg laid, and a female will lay from 50 to 300 eggs in her lifetime. More than 5,000 aphids may be eaten by a single adult ladybug in its lifetime.
Sexual forms are produced in the autumn, winged egg-laying females and wingless males. Mating takes place and eggs are laid near the tips of the shoots, sometimes in large batches. These are green at first but soon turn black. [1] Ants are often present among the colonies, feeding on the honeydew secreted by the aphids.
A female aphid lives for 9 to 25 days and can produce from 25 to 125 young during its life. There may be up to twenty generations in the year. By November winged forms have developed and eggs are laid before winter sets in. [6] In warmer climates, parthenogenetic reproduction takes place throughout the year.
In aphids, the presence of a particular species of γ-3 Pseudomonadota makes the aphid relatively immune to their parasitoid wasps by killing many of the eggs. As the parasitoid's survival depends on its ability to evade the host's immune response, some parasitoid wasps have developed the counterstrategy of laying more eggs in aphids that have ...
Aphidius wasps are endoparasitoids of aphids. The female wasp lays eggs in an aphid. When the eggs hatch, the wasp larvae feed on the inside of the aphid. As the larvae mature, the hosts die and become slightly enlarged or mummified, often becoming tan or yellow. Complete metamorphosis occurs within the host.
Adults released in enclosed settings such as greenhouses can contribute to lower aphid numbers. [5] However, they tend to disperse before mating and laying eggs, so eggs are not left behind to hatch and continue the cycle of controlling the aphid population. This occurs even when live prey is still present. [12]
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 ...
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