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Pre-dispersal predation and seed damage of Centaurea scabiosa L. (Asteraceae)

Summary
Centaurea scabiosa L. (Asteraceae) is host plant of several Tephritidae (Diptera) species. They use flower heads for development and are the main predators of the seed. We studied the mechanism of fruit fly damage in number, weight and germination of the seeds.
Dominant species in C. scabiosa flower heads was Terellia colon (Terelliinae), which destroyed 11 % of seeds. Undamaged seeds from central flower heads were significantly lighter than in lateral flower heads.
Germination of the seeds was not significantly correlated with proportion of damaged seeds. However damage to flower head, significantly reduced weight of the remaining healthy seeds.

german version

Keywords/Stichworte: Centaurea scabiosa ; Tephritidae; Terellia colon ; germination

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Autor:S. KOPRDOVA, Charles University, Faculty of Science, Department of Zoology, Vinicna 7, CZ 12844 Praha 2, Czech Republic, e-mail: Koprdova@seznam.cz;
Z. MARTINKOVA, Research Institute of Crop Production, Drnovska 507, CZ 16106 Praha 6 – Ruzyne, Czech Republic, e-mail: martinkova@vurv.cz

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