Tree Health in England

Lord Benyon Excerpts

Thursday 9th June 2022 Grand Committee

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

My Lords, I start by referring to my entry in the register. As other noble Lords have, I congratulate the noble and right reverend Lord, Lord Harries of Pentregarth, on securing this debate and other noble Lords on their powerful contributions. This is an emotive subject for me. I was looking at a woodland at home the other day, two-thirds or possibly three-quarters of the canopy of which is or was ash. As has been said, this is the first tree disease where the wider public are seeing something really tragic happening to our green and pleasant land.

Trees are of central importance in our efforts to fight back against climate change and biodiversity loss—a point powerfully made by the mover of this debate. That is why the Government have committed to increasing tree planting rates across the country to 30,000 hectares per year by the end of this Parliament. But planting trees is not enough. It is critical that we also protect them from the threats of pests and diseases. Our current treescape has an asset value of £175 billion, but the threat from plant pests and pathogens is significant and growing, driven by increasing globalisation and by climate change.

The noble and right reverend Lord, Lord Harries, asked what assessment Her Majesty’s Government have made of the health of trees. I assure noble Lords that we have a robust and comprehensive plant health system, operating pre-border, at the border and inland, to reduce the risks of pests and diseases entering the country and to manage the impact of established pests. We cannot overlook the professionalism in our nursery sector. I will name Nicholsons in Oxfordshire, which I visited the other day. It has superb phytosanitary policies in place and huge amounts of expertise in its staff, which complements the work done by government employees.

The Government’s UK plant health risk register—this answers a point raised by a number of noble Lords—tracks and prioritises plant health risks. Over 1,200 pests and diseases are listed on the register, 30% of which are capable of attacking trees. Risks are reviewed monthly for action, such as further regulation or increased inspections.

The process also enables us to consider factors that may be pertinent to climate change adaptation, such as identifying pests and diseases that might be expected to increase in range or prevalence due to climate change. Our plant health research and development programme is investigating these potential issues further, aiming to identify and prioritise exotic plant pests and pathogens with the greatest likelihood to establish or spread in the UK as a result of a change in climate.

I chair a monthly biosecurity meeting attended by officials and the Chief Plant Health Officer and I am brought up to date on a more regular basis on the progress across Europe of tree pest and diseases, which are always alarming. My noble friend was right to raise the nightmare potential of Xylella. You only have to go to southern parts of Italy and other parts of southern Europe to see whole landscapes devastated by that disease. It is an absolute priority that we keep it out of these islands.

Since leaving the EU, we have strengthened our import regime by introducing a prohibition on imports of the highest-risk trees, including many native species, and a requirement for phytosanitary certification of all plant imports. We require the pre-notification of all imports of regulated plants and timber to allow for official inspection. Our border inspectors now carry out over 70,000 physical checks each year. We also have a significant inland surveillance programme and have invested additional resources to drive increased inspection rates at the highest-risk sites.

The Forestry Commission is responsible for carrying out ground surveys of over 40,000 trees for priority pests and diseases, such as bark beetles, sweet chestnut blight and canker stain of plane. The Animal and Plant Health Agency carries out over 5,500 inspections at nurseries each year. The Forestry Commission also carries out risk-based aerial surveillance of over 1 million hectares of woodland each year. Aerial surveillance is a powerful and cost-effective tool, with new technology supporting it that enables the Forestry Commission to survey a significantly larger area than would be feasible using ground-based surveys alone.

Citizen science and sightings from the public further enhance surveillance. The Observatree network of trained volunteer health surveyors is a network of over 200 trained volunteers in England, Wales and Scotland, and is supported by a dedicated team of professionals. Lastly, the TreeAlert service is run by Forest Research and receives reports from the general public. These surveillance programmes produce rich datasets, which feed into the Tree Health Diagnostic and Advisory Service, which diagnoses potential pests and pathogens and produces quarterly reports. New statistics released last month show that last year, up to March 2022, the service dealt with a record 3,790 inquiries or samples of suspected tree diseases and pests—a nearly 25% increase on the previous year. This is the public getting involved in science and the risk that we face. The most commonly identified pests and disease were oak processionary moth and ash dieback.

We also aim to limit and manage the outbreaks that occur and are currently taking robust, official and urgent action—the word “urgency” was rightly used by a great many noble Lords—to contain or eradicate a number of regulated pests, such as Ips typographus, Phytophthora pluvialis, Phytophthora ramorum and oak processionary moth, using tree removal or treatment of infested trees. We are deeply indebted to landowners such as my noble friend who, in the south-east of England, have faced the arrival of Ips typographus and are helping us create a cordon sanitaire, so that other insects that blow over from the channel will have nowhere to go because there will be none of that type of spruce there. Dealing with outbreaks is costly so, where feasible, we aim for eradication. One example is the eradication of a small outbreak of Asian longhorn beetle in Kent between 2012 and 2019, which cost around £2 million. In comparison, the cost of managing the insect in the United States, where eradication has not been possible, has been at least $373 million.

An outright ban on plants and trees may seem to some like a simple solution. However, UK production does not currently meet demand and trade in plants and plant material is essential for many reasons, including food security and resilience to climate change. Additionally, many invasive pests, such as ash dieback and Ips typographus, can arrive independently across the channel, having been blown here on warm winds. It is therefore impossible to reduce the risk of new pests and diseases arriving to zero, which is why we have in place this comprehensive system of surveillance and reporting for tree health threats.

We have recently invested £5.8 million to build a new world-leading quarantine laboratory at Forest Research’s Alice Holt site in Hampshire. The new facility means we now have the capability to undertake research and diagnostic work on quarantined pests and pathogens in a secure and contained environment. On top of this, we are investing in measures to increase the resilience of our treescape to future threats. We provided up to £10.5 million in the last financial year to support the sector to increase UK production of diverse, high-quality tree-planting stock and to enhance biosecurity.

At the risk of falling out with my friend, the noble Baroness, Lady Young, I challenge the view among some that we should restrict our plantings in this country just to native species. We face such threats of diseases and climate change that if we put our eggs in too few baskets, the chance of this green and pleasant land remaining so is put further at risk. I want the whole sector, whether NGOs such as the Woodland Trust, which I respect and admire, Confor and the forestry industry, the amenity planters or local authorities, as mentioned by the noble Baroness, Lady Bennett, to work together with a single sense of purpose.

I am running out of time. I will try to address some of the other points raised. On ash dieback, we have planted thousands of the most resistant plants in the south of England and we are monitoring them. As has been said, a lot of work is being done on the genome. There is a relentless attempt to try to home in on the most resistant ash trees, to take stock from them and to build, and not to have to wait for five decades, as we have with elm.

We recognise that the tree-planting targets, which have been referred to, are ambitious. We recognise the importance of hedgerow trees as well. That is a very important point. The loss of ash from that landscape is as devastating as the loss of the elms that I remember.

Noble Lords made many other points; I will sit down and write to them with replies.

Our plant health regime aims to detect and stop new issues at early stages. Where this is not possible, our surveillance systems give us the best chance of discovering and managing, or eradicating, those pests and diseases which do arrive. Government-funded research and development provides hope even against established diseases.

As noble Lords will no doubt appreciate, tree health is an active area in which the Government have invested in recent years. Later this year we will publish an updated plant biosecurity strategy, which the noble Baroness, Lady Young, asked about. On 23 May, we signed a new plant health accord with industry, trade bodies, the Woodland Trust and others. In the accord, we have agreed to work together to promote biosecurity best practice for all—an effort in which I know we are all united.

I am sorry that we have run out of time. A great many questions were asked. I will endeavour to answer them by another means.