Japanese Knotweed

Debate between Lord Gardiner of Kimble and Earl of Kinnoull

Thursday 16th May 2019 Lords Chamber

[Lord Gardiner of Kimble]

The noble Lord raises something really important. A very good practice manual has been published as part of a RAPID LIFE project, showing the varying ways in which this can be dealt with. They all have their issues because of the rhizome’s ability to continue, even dormant, for 20 years. Glyphosate, properly used by trained people—I emphasise “properly”—can kill Japanese knotweed in about two or three years. Biocontrol would obviously be preferable for reducing the aggressiveness of the growth, but there is a whole range of issues. I am happy to share the manual with the noble Lord.

[The Earl of Kinnoull (CB)]

My Lords, I draw attention to my interests in the register. Of course, knotweed is not the only invasive alien species around. This is Invasive Species Week; indeed, the Minister has been seen in the newspapers digging up skunk cabbages. Can he confirm that the Government are intensifying their efforts to combat invasive alien species in general, and in particular the grey squirrel, which is doing so much, so distressingly, to kill our broad-leaf trees?