Neoclytus acuminatus

Neoclytus acuminatus, females laying eggs on ash, males aufreitend

Neoclytus acuminatus is a beetle of the family of longhorn beetle and the subfamily Cerambycinae.

The genus name Neoclytus points out that the genus to the genus Clytus recalls ( ancient Greek νέος Neos ' new '. Species name acuminatus (Latin ) means pointedly .' In Europe, the genus Neoclytus is acuminatus represented only by Neoclytus, world distinction is more than fifty species.

The species has been introduced from North America to Europe.

Characteristics of the beetle

The vividly colored beetle reaches a length of eight to fifteen millimeters. The rust-colored body is angedunkelt at various points. A dense yellow pubescence requires a cross-striation of the elytra and abdomen.

The head falls forward from steep, the mouthparts pointing downwards ( Fig. 1). The eleven-membered threadlike antennae are turned in near the bulge of the flat eyes. The middle antennal segments are angedunkelt in the male especially.

The large pronotum (Fig. 2) is in the male slightly longer than broad, the female as wide as long. Front and rear edge are angedunkelt. The flat top has wart-like bumps ( tubercles ) that accumulate along in the middle and on the sides. Remarkable are partially defined short transverse keels.

The narrow elytra narrowing to the male backwards significantly, the female hardly. They end cut at an angle and at the edges of the section pointed ( Fig. 3). You are angedunkelt with the exception of the base and the tip. A strip at the base and three narrow transverse bands of the elytra appear through the hair bright yellow ( Fig. 4).

The front rails and the long medium and very long hind rails support at the end of two delicate spikes. The center and rear legs are club-shaped thickened towards the end and angedunkelt there. The tarsi are apparently four members since the small fourth generation is hiding in the bulge of the third member.

Biology

The beetles develop in various hardwoods (fruit trees, mulberry, oak, rose, Judas tree, horse chestnut, vine ), preferably in ash trees. Accordingly, the English name of the kind of " red-headed ash borer " ( red-headed ash borer ). the French name is " Clyte you frêne " ( Clytus the ash).

The males produce a pheromone glands of the anterior chest, the males and females equally attracts. The release of the volatile pheromone is accompanied with a typical posture in which the males remain with raised front legs and front body. Males take on this position frequently, females never.

The animals are diurnal and collect on stressed and dying trees, in which the eggs are deposited. The beetles run very nimbly around on the wood and often different individuals of Art meet this Before mating, the males touch females with their antennae. They recognize the gender of the females by a hormone that is released in the lipids of the cuticle of females ..

The beetles overwinter, probably as a doll in the infested wood. The adults appear in early spring. Eggs are laid under the bark. The legless cream-colored larvae bore first in the phloem under the bark, then in the sapwood, which she occasionally eaten completely into flour. Each year, two generations are counted in Iowa ( North America ), may come elsewhere one to three generations per year before or the larval to the Imago takes several years. The Ausschlupfloch is circular. With heavy infestation can be found on a palm-sized area 15 to 20 Ausschlupflöcher.

Dissemination

The award from North America entrained ( after Germany ) animals have first naturalized in southeastern Europe near the coast (Italy, Dalmatia, Istria ), and spread from there to the north. Today they are known in Italy, Switzerland, Slovenia, Croatia and Hungary. The beetles are also common in Central and South America. In Romania, there is a new declaration.