title: [On the biology, morphology and behaviour of apion virens Hrbst. (Col., Curculionidae)].
abstract: This paper intends to give a contribution to a monography of Apion virens. From the different stages the duration of development and some details of the morphology are presented. The longevity of the adults reaches 11 to 12 months when uptake of food during hibernation is possible.The pigmentation of pupae and adults, which is described in detail, takes place progressively.The maximum number of eggs per female was 166.Investigations about the phenology showed several well separated phases in the course of one year. Trifolium species are the most suitable host plants of A. virens.The range of preference of temperature and humidity changes characteristically during the year. - Between ♂♂ and ♀♀ there exist also differences in the optimum temperature range.Copulation, egg-laying and cleaning behaviour are described in detail.
authors.affiliation: Institut für Pgytopathologie der Justus-Liebig-Universität Gießen, Gießen, Deutschland.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Stein