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Aphids (Aphidoidea) belong to the plant aphids with 3000 known species, of which about 850 live in Central Europe in many colours and sizes. They all feed on plant sap. Many of them are specialised in very specific plants - for example, the most dangerous species in viticulture - the phylloxera, which only attacks the vine. They also change their appearance during the course of the year, and their life cycle is very complex. The winged aphids are responsible for the spread, the next, unwinged generations are relatively stationary and form dense colonies very quickly. As plant suckers, the animals are equipped with a piercing trunk. The aphids feed by piercing and then sucking juices from leaves and also roots. As a defensive reaction of the plants, bile (growths) are formed on leaves or roots.

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