Appearance
Byctiscus betulae is a stout 5,5-9,5mm Weevil with iridescent, shiny green, blue or sometimes copper colouring all over. The males carry a forward pointing tooth on each side of the pronotum.Stirn zwischen den Augen schwach vertieft, mit länglichen Punkten [Abb.1]. Spitze der Flügeldecken mit sehr feiner, flaumartiger, heller Behaarung, die nur im Profile sichtbar ist. Unterseite stets von der Färbung der Oberseite. Körper grün (Stammform) [Abb.2], oder blau oder grünlichblau oder fast kupferig; manchmal die Färbung der Flügeldecken anders als die des übrigen Körpers. Aedoeagus [Abb.3]. .
Reproduction
The female rolls a "cigar" out of one or more leafs of the host plant and deposits various eggs in it. The larvae feed on the substance of the rolled leafs and continue to do so after the roll falls from the tree. Later they dig into the ground to pupate. A new generation may already emerge in fall, or otherwise in early spring.Food
This beetle is very polyphagous, feeding and developing on Betula, Pirus, Alnus, Corylus, Tilia, Salix, Populus and various Fruits and Vines where it can be considered harmful for production.References:
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