Phyllobius pyri
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Phyllobius pyri |
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| ( Linnaeus , 1758) |
Phyllobius pyri , also known as the pear green weevil , is a beetle from the family of weevils and the subfamily Entiminae .
features
The weevils reach a length of 5–7 mm. The species shows a sexual dimorphism , the males are clearly slimmer and longer than the females. The body is colored black, the top has dense to moderately dense green, more rarely copper-red elongated scales and hair of the same color. All the hair on the elytra is close to the skin, not erect. The scales can be evenly or partially reduced on the uneven spaces between the rows of dots on the wing coverts, which then gives an impression of longitudinal stripes. They can also be largely absent, especially on older specimens. The legs and antennae can also be black, often they are colored red-brown in whole or in part.
The species is very similar to its sister species Phyllobius vespertinus , with which it was unjustifiably united to a species earlier, and is difficult to distinguish from this and some other green weevils . The following features are important for an exact determination: the eyes protrude strongly, roughly hemispherical, from the head contour, the short trunk is not conically narrowed towards the tip, the forehead is much wider, about twice as wide as the top of the trunk between the sensor pits. The rails of the front legs have a sharp edge along their entire length; they are flattened. All thighs can be toothed, the fore legs always have a large, broad triangular tooth.
distribution
The species occurs in the Palearctic . It is widespread in Europe. It occurs in the north of the British Isles and Fennoscandinavia . In the east the distribution area extends across Siberia and Central Asia to East and Southeast Asia (Japan, Philippines).
Way of life
The beetles are often found on the foliage of the rose family (Rosaceae) such as cherries, pears, apples, mountain ash and hawthorn, but they feed on a large number of deciduous trees, shrubs and also herbaceous plants. They are more common on leaves of woody plants than their sister species Phyllobius vespertinus , which prefers herbaceous species. The larvae feed on roots in the soil. They are given by sorrel and poplar, or by grass roots.
The imaginal beetles appear in Germany from mid-April to mid-June, in cool regions only from the end of June.
Individual evidence
- ↑ Common Leaf Weevil - Phyllobius pyri . www.naturespot.org.uk. Retrieved April 25, 2017.
- ↑ Phyllobius pyri . www.insektenbox.de. Retrieved April 25, 2017.
- ↑ Phyllobius pyri / pear green weevil . www.naturspaziergang.de. Retrieved April 25, 2017.
- ^ Karl Wilhelm Harde, Frantisek Severa: Der Kosmos Käferführer. The Central European beetle. Franckh-Kosmos Verlags-GmbH & Co, 4th edition, Stuttgart 2006, ISBN 3-440-06959-1 . Page 304.
- ↑ a b c d Lothar Dieckmann (1980): Contributions to the insect fauna of the GDR: Coleoptera - Curculionidae (Brachycerinae, Otiorhynchinae, Brachyderinae). Contributions to entomology Berlin 30 (1): 145-310, doi : 10.21248 / contrib.entomol.30.1.145-310 .
- ↑ a b Arved Lompe (after R. Frieser): Genus: Phyllobius Germar in European beetles, identification tables. last updated on September 8, 2016.
- ↑ a b c Jiří Zahradník, Irmgard Jung, Dieter Jung et al .: Beetles of Central and Northwestern Europe. Parey, Berlin 1985, ISBN 3-490-27118-1 . Page 311
