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Here we group together sweet chestnut, beech, pedunculate oak and sessile oak. In the Aphid key folder simplified keys based on photos or morphological criteria are provided to help you identify aphid species.

Sweet chestnut (Castanea sativa)

This is cultivated for its wood used for construction timber, flooring, barrel-making but also for its fruit: chestnuts.

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Beech (Fagus sylvatica)

The beech is a tree used mainly for firewood, carpentry or as source of fibres for the paper industry.
It is also appreciated as an ornamental species, with a wide diversity of horticultural varieties.  Cultivars exist that have crimson foliage, with dentate leaves, with weeping or narrow column shape.
Sometimes it has been used for the extraction or manufacture of diverse substances, like creosote.

Pedunculate oak (Quercus robur) and sessile oak (Quercus petraea)

Oak is the most widespread tree in France, used in carpentry, furniture and cabinet making.
Some species of aphids are common to oak and sweet chestnut