Occurrence, bionomics and harmfulness of Chrysomela populi L. (Coleoptera, Chrysomelidae)
Urban, J.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta) E-mail:[email protected]
In 2003 to 2005, Chrysomela populi gradated on yearly cut Populus nigra var. italica in street alleys in Brno and elsewhere in the Czech Republic. Imagoes occurred on trees from the end of April or from the beginning of May. In rearing, the chrysomelid consumed leaves of 2-year shoots and laid on average 142 eggs. On leaves of shoots, imagoes damaged 100 to 200 cm2 during 5 to 7 weeks, produced 480 to 900 frass pellets and laid on average 506 eggs. Embryonal development took 6-8 (in the laboratory 5) days. Larvae of the 1st generation occurred from mid-May to mid-July. In the laboratory, prepupae took 2 days and pupae 4 days. Imagoes of the 1st generation occurred from June to September. Part or all imagoes of the 2nd generation diapaused. Imagoes of the 3rd generation damaged 40 to 70 cm2 leaves before departure to wintering grounds. In our natural conditions, the prospective 3rd generation was always incomplete. Cleonice callida and Schizonotus sieboldi rank among important enemies.
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