Poisonous plants in grasslands - management options for Senecio aquaticus
Abstract
In Senecio aquaticus, the developmental stage of the seedling is followed by a leaf rosette, persisting vegetatively from 2 to at least 6 years. Many but not all individuals behave monocarpic (c. 80 %). According to the transition matrix models, cutting in June and September, as usually practiced in the investigation area, promotes population growth, while two cuts before seeds are able to mature (July and August) may control population growth. For mesotrophic meadows that are important from an agricultural as well as from a nature conservation point of view, we recommend a first cut at the beginning of June. At that time, Senecio aquaticus is still in the rosette stage and only few leaves will get into the fodder. Afterwards, two cuts (fodder utilisable only to a limited extent) should happen during the main flowering time in order to prevent seeding of S. aquaticus. Because of the longevity of seeds and rosettes, the effect of different management regimes has to be verified after several years. According to the molecular analysis, there is genetic evidence for the occurrence of hybrids between S. aquaticus and S. jacobaea in eastern Austria. However, the analysed hybrid population occurs at the roadside, not in grassland. The content of alkaloids in Senecio aquaticus varied considerably between populations, among different years and during the vegetation period.
keywords poisonous plants population biology control grassland management
Publikationen
The impact of different cutting regimes on population density of Jacobaea aquatica (Hill) G. Gaertn., B. Mey. *** Scherb. and grassland vegetation
Autoren: Bassler, G; Karrer, G; Kriechbaum, M Jahr: 2016
Journal articles
Pyrrolizidine alkaloid production of Jacobaea aquatica and contamination of forage in meadows of Northern Austria
Autoren: Chizzola, R; Bassler-Binder, G; Karrer, G; Kriechbaum, M Jahr: 2019
Journal articles
Project staff
Gerhard Karrer
Ao.Univ.Prof.i.R. Mag.rer.nat. Dr.rer.nat. Gerhard Karrer
gerhard.karrer@boku.ac.at
Tel: +43 1 47654-83119
Project Leader
14.12.2007 - 31.12.2017
Monika Kriechbaum
Ao.Univ.Prof. Dipl.-Ing. Dr.nat.techn. Monika Kriechbaum
monika.kriechbaum@boku.ac.at
Tel: +43 1 47654-83411
Project Staff
14.12.2007 - 31.12.2017
BOKU partners
External partners
Dipl.-Ing. Gabriele Bassler_x000D_ Techn. Büro für Landschaftsplanung und Landschaftspflege_x000D_
Dipl.-Ing. Gabriele Bassler
partner