Acorn drill
| Acorn drill | ||||||||||||
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Acorn borer ( Curculio glandium ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Curculio glandium | ||||||||||||
| Marsham , 1802 |
The acorn borer or common acorn borer ( Curculio glandium ) is a beetle from the family of weevils (Curculionidae).
features
The beetles are 4 to 7.5 millimeters long. Their body is covered with elongated, yellow-brown or red-brown, adjoining scales. They look very similar to the closely related but somewhat smaller hazelnut borer ( Curculio nucum ). However, they do not have a hair comb on the suture of the wing cover and the flagellum limbs are longer than wide and only loosely haired, tightly fitting instead of protruding. The proboscis of the males is only as long as the wings, that of the females is body length.
Occurrence
The animals are found all over Europe , North Africa and Turkey , but become rarer towards the north. They live in different habitats with trees, such as forests and large hedges.
Way of life
The females use their proboscis to eat deep holes in immature acorns and then lay one or two eggs in the fruit. After about two weeks the yellowish white, legless larvae hatch red-brown on the head. Their way of life is similar to the larvae of the hazelnut borer. They develop within the fruit and leave it with a body length of 9 to 10 millimeters in order to hibernate about 25 centimeters deep in the ground before they pupate in the ground in the spring of the following year. The adults of the new generation hatch in the next May or June.
supporting documents
Individual evidence
- ↑ http://www.insektenbox.de/kaefer/eichbo.htm
- ↑ Harde, Severa: Der Kosmos Käferführer, The Central European Beetles , p. 318 Franckh-Kosmos Verlag GmbH & Co, Stuttgart 2000, ISBN 3-440-06959-1
literature
- Karl Wilhelm Harde, Frantisek Severa and Edwin Möhn: The Kosmos Käferführer: The Central European Beetles. Franckh-Kosmos Verlags-GmbH & Co KG, Stuttgart 2000, ISBN 3-440-06959-1 .
- Georg Möller, Reiner Grube, Ekkehard Wachmann : The Fauna Käferführer I - Beetles in and on the forest Fauna-Verlag, Nottuln 2006, ISBN 3-935980-25-6 .
- Jiři Zahradnik, Irmgard Jung, Dieter Jung et al .: Beetles of Central and Northwestern Europe. Parey, Berlin 1985, ISBN 3-490-27118-1 .
