Japanese Knotweed - Question

Part of the debate – in the House of Lords at 11:23 am on 16th May 2019.

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Photo of Lord Gardiner of Kimble Lord Gardiner of Kimble The Parliamentary Under-Secretary of State for Environment, Food and Rural Affairs 11:23 am, 16th May 2019

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.