Japanese Knotweed

Debate between Lord De Mauley and Baroness Sharples

Wednesday 9th April 2014 Lords Chamber

[Baroness Sharples]

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

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

My Lords, we are in the fourth year of the controlled release of the psyllid Aphalara itadori as a means of controlling Japanese knotweed. No non-target impacts have been observed by the monitoring programme but, as yet, the organism has had difficulty establishing self-sustaining populations. This year, therefore, we will conduct caged trials releasing larger numbers to establish higher population densities.

[Baroness Sharples (Con)]

Will my noble friend agree to holding a publicity campaign so that this plant can be easily recognised, especially by landowners and, even more importantly, by people seeking to buy a house with land, because in some cases they are being refused a mortgage?

[Lord De Mauley]

My Lords, in returning regularly to this question, my noble friend is almost as persistent as the weed itself. I am not sure whether she is a hardy annual or a perennial. We need to spread public awareness of a number of non-native species including, of course, Japanese knotweed. The website nonnativespecies.org is our central point. Other awareness-raising measures include nearly 70 identification sheets, including one for Japanese knotweed, the Environment Agency’s PlantTracker mobile device app, which I recommend to your Lordships, non-native species local action groups, and the Be Plant Wise and Check, Clean Dry campaigns, which target aquatic security and non-native species more generally. Awareness-raising is a key focus of our current review of the GB strategy on invasive non-native species.

My noble friend mentioned mortgages. Two years ago, the Royal Institution of Chartered Surveyors and the Council of Mortgage Lenders agreed that a less draconian approach was needed.

Japanese Knotweed

Debate between Lord De Mauley and Baroness Sharples

Monday 8th July 2013 Lords Chamber

[Baroness Sharples]

To ask Her Majesty’s Government what progress has been made in eliminating Japanese knotweed in the United Kingdom.

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

My Lords, we commenced a controlled release of Aphalara itadori to tackle Japanese knotweed in 2010. The signs are encouraging for the establishment of this highly specialist psyllid. Aphalara successfully overwintered but numbers remained low and so additional releases were made in spring 2012 and spring 2013. No non-target impacts have been observed by the programme of close monitoring.

[Baroness Sharples]

Will the psyllid really be enough to kill off this pernicious weed? There are increasing reports of wretched owners of land who have had their land affected by Japanese knotweed and have been refused mortgages. Why can we not give them natural Roundup which is unpolluted? I managed to kill off my knotweed a number of years ago.

[Lord De Mauley]

My Lords, experience from around the world has shown that biocontrol tends to take five to 10 years from the initial releases to achieve effective control. Despite poor summer weather since its release, Aphalara has shown that it can survive in small numbers and overwinter in the wild here. The question is how we can encourage it to achieve survival in larger numbers.

My noble friend mentions mortgages, and we are aware that some mortgage lenders have become reticent to lend if Japanese knotweed poses a threat to the property concerned. We have undertaken some work to estimate the impact of this. The RICS believes that recent concerns by valuers and lenders are often based on misunderstandings, and it consulted on that in 2011 in order to help valuers and mortgage lenders to understand the implications. Cornwall council has also provided guidance for mortgage lenders.

On the use of Roundup, I understand that others have also had success with it. Of course, it needs to be applied with care, and we are also looking carefully at a couple of other possible biocontrol options.

Forestry

Debate between Lord De Mauley and Baroness Sharples

Tuesday 5th February 2013 Lords Chamber

[Baroness Sharples]

Does my noble friend not agree that with four bodies already dealing with forestry, one more is really one too many?

[Lord De Mauley]

My Lords, I do not think we are going to have one more, save that we will effectively split the management of the public forest estate away from what Forest Services does.