Which states require that certain poisonous ragwort (Senecio species) are to be reported or must be notified (german: meldepflichtig) to protect men and husbandry?
Do you know an evidence based actual "Reportable Species List" for poisonous plant species?
The question is of great concern as Senecio jacobaea, Senecio aquaticus and Senecio alpinus show a rapid increasing propagation speed in central Europe as in Austria, Germany, Swiss and Poland as I saw with own eyes.
Do you see also here the influence of the increasing biodiversity of grassland with environmentally-favourable extensification of farming and management of low-intensity grassland which favor increasingly also poisonous plants for husbandry?
Johann HUMER,
Austria Senior expert in grassland and vegetation science.
Best thanks !
There are links and notes that claim this, like:
https://www.gartenjournal.net/jakobskreuzkraut-meldepflichtig
http://www.strickhof.ch/fachwissen/pflanzenschutz/kreuzkraeuter/
http://www.ragwortfacts.com/ragwort-notifiable-weed.html
HI
THIS LINK CAN HELP YOU
http://www.kingcounty.gov/services/environment/animals-and-plants/noxious-weeds/weed-identification/tan
Sorry this link did never work here in Austria.
I tried it 10 times.
http://www.kingcounty.gov/services/environment/animals-and-plants/noxious-weeds/weed-identification/tan
That's because part of the link is missing. The full link is http://www.kingcounty.gov/services/environment/animals-and-plants/noxious-weeds/weed-identification/tansy-ragwort.aspx
However, I think it's worth noting that this species (S. jacobaea) is non-native in America (King County is in Washington State), and that is significant to their desire to control/ eradicate it. It's a different matter in Europe, where this species (along with the others you list) is native, and very important for many invertebrates.
Here in Britain it's hard to say whether it's increasing; there is no requirement for people to report ragwort as a weed and, along with other native plants, the available data (https://species.nbnatlas.org/species/NBNSYS0000004364) is largely collected through botanical societies, especially the Botanical Society of Britain and Ireland, and the Botanical Society of Scotland. However, this can’t be used to produce annual trends, because recording effort is not consistent. There are some statements on trends over longer periods:
“A detailed study of vegetation change published in 2006 shows that the distribution of ragwort has not significantly changed over the last 20 years.” From Scottish Government guidance on preventing the spread of ragwort (http://www.gov.scot/Resource/Doc/228241/0061833.pdf).
This contrasts with a perception that it is increasing, and this seems likely on a local scale. As far as I can tell, this is more closely related to management - heavy grazing and poaching excludes more palatable species, ground disturbance encourages ruderal species - than to any change in the behaviour of ragwort.
In Scotland we seek to promote a balanced view of ragwort which appreciates its value as a native species, especially to pollinating insects, but accepts that there are situations when it will need controlling. It is poisonous, especially to horses, and it will be important to control it on land grazed by horses or used to produce forage – but it should be remembered that “in the right environment, and where there is no risk to animal welfare, ragwort contributes to the biodiversity of the flora and fauna in our countryside” – another quote from the Scottish Government guidance referred to above.
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