Japanese Knotweed

Baroness Sharples Excerpts

Wednesday 28th March 2012 Lords Chamber

Asked By

[Baroness Sharples]

To ask Her Majesty’s Government what progress they have made in eliminating Japanese knotweed from the United Kingdom.

[The Parliamentary Under-Secretary of State, Department for Environment, Food and Rural Affairs (Lord Taylor of Holbeach)]

My Lords, we are working towards sustainable natural control of Japanese knotweed. The controlled release of the highly specialist psyllid, Aphalara itadori, is progressing well and we are nearly two years into the release phase. If successful, the psyllid should restrict the growth of Japanese knotweed, slow its capacity to spread as vigorously and enhance the effectiveness of other management effort. I regret to say that it will not eradicate this invasive plant altogether.

[Baroness Sharples]

My Lords, perhaps in my perseverance in asking this Question over 25 years, we are actually getting somewhere. The psyllid is quite a success but are there other ways of ridding ourselves of this extremely invasive and destructive weed?

[Lord Taylor of Holbeach]

I would like to thank my noble friend for her persistence, which I think rivals the Japanese knotweed in its vigour and eradicability. Research is going on into a leaf spot fungus, which also has the capacity specifically—this is the key to biological control—to attack Japanese knotweed. Defra and the devolved Administrations are also supporting catchment scale control work on Japanese knotweed in several areas across the country.