Occurrence, biology and harmfulness of Galerucella lineola (F.) (Coleoptera, Chrysomelidae) - Part 1. Last year's (parent) beetles
2007
Urban, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta
The occurrence, biology and harmfulness of Galerucella lineola was studied in Moravia (Czech Republic) between the years 1995 and 2006. An alder biological form was studied in Alnus glutinosa and A. incana mainly in Polnicka Forest District (Zdar region, Czech Republic) and a willow form in Salix viminalis, S. triandra and S. caprea in riparian and accompanying stands of the Svitava river near Bilovice nad Svitavou (Brno region). Imagoes leave their sites usually in the 1st half of May. In the course of 2.5 to 3 months, they damage on average 22.6 square cm leaves of A. glutinosa and S. caprea (males 3.2 times less than females). Males eat on average 15 times during 24 hours for a period of 3.5 minutes, i.e. in total 52 minutes. Females eat on average 36 times for a period of 7 min, i.e. 252 min per day. Imagoes copulate on average 10.2 times per day for a period of 67 min. For the whole period of reproduction (about 42 days), they copulate on average 428 times, i.e. for 20 days. Eggs are laid into groups of 3 to 20 (on average 14) pieces. Females lay 457 to 791 (on average 612) eggs, i.e. about 15 eggs per day. Medina collaris and Townesilitus fulviceps belong, among others, to the enemies of imagoes.
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