Greetings All Greenfingers,
Who knows about this horrible stuff?
I'm preparing a community project to tackle a serious infestation of Knotweed alongside a local river. There is plenty of info "out there" for dealing with this virulent invasive species and we are chatting to rangers and fisheries officers about this. But I vaguely recall some discussions on DHP about this some years back, and some people seemed fairly knowledgable.
Here is the standard advice: http://invasivespeciesireland.com/most- ... e-knotweedhttp://www.fisheriesireland.ie/Invasive ... tweed.htmlhttp://www.aughty.org/pdf/jap_knot_mgmt.pdf
And a most useful resource from across the pond: http://www.devon.gov.uk/environment/nat ... otweed.htm
Basically, this stuff is a devil to get rid of. Some interesting research has been done on bio-control using wee beasties that exclusively feed on knotweed. http://news.bbc.co.uk/2/hi/science/nature/8555559.stm
(And there are plenty of opinions about that).
But I've been wrestling with a circular argument. This knotweed infestation is alongside a sensitive eco-system with lots of rare and special plants. It is also in a SAC (Special Area of Conservation), and on a noted salmon fishing river. Usual methods of control (cutting, uprooting, strimming etc) are no good (in fact, the worst possible thing to do. This stuff sprouts up from the tiniest remnant of a plant) and herbicides are the common recommendation ( Glyphosate ). Typical advice here: http://dnr.wi.gov/topic/Invasives/docum ... ontrol.pdf
But herbicides in a sensitive environmental area and alongside a fishery are not ideal either.
In fact, even more radical surgery is required as shown by this commercial case-study. http://www.japaneseknotweedireland.com/case-study-1
Disposing of the "dead" remnants is also a problem (Like a "dead" snake, not to be trusted!). Complicated berms need to be constructed and the plant remains buried on an impervious sheet and soaked in even more herbicide.
So, just wondering what advice might be out there? I'm thinking fire! What would a Druid do?