Biosecurity and Infectious Diseases

Baroness Walmsley Excerpts

Thursday 18th January 2024 Lords Chamber

[Baroness Walmsley (LD)]

My Lords, I congratulate the Minister on his appointment to the Front Bench and the noble Lord, Lord Trees, on his very comprehensive introduction to the debate. I also welcome to the noble Baroness, Lady Murphy, back to good health and to the Chamber; she made a very important speech today.

When we were a member of the European Union, we benefited from sharing with other members measures to prevent plant and animal, as well as human, diseases. We shared intelligence of disease threats; common rules on phytosanitary standards, border security and animal health; world-leading scientific and pharmaceutical developments; and veterinary expertise. Since we left, we have had to invent our own system and develop partnerships where we can. Our developing border controls regime, some of which came into effect only this month, is very important in that respect. We have heard very important points from several noble Lords on that subject, including the noble Lords, Lord Taylor, Lord Lilley, Lord Krebs and Lord Davies of Brixton.

As a botanist, I will focus on diseases of plants, including those that we eat and those that we need for other purposes. Half of all emerging diseases of plants are spread due to the increasing globalisation of the trade in plants and plant materials, including soil, by both traders and individuals. Natural spread, assisted by weather events, is the second most important factor. Global warming can also enable the establishment of pests that would otherwise not survive a winter here in the UK. As we know, our country has just had the warmest year for decades, and that affects our economy and biodiversity.

As a former member of your Lordships’ recent special inquiry into the state of the UK horticulture business, I will mention some of our findings on plant diseases and the effect on our economy of poor control. Sandy Shepherd, managing director of Ball Colegrave, told us, as a witness from the industry, that biosecurity is

“the fundamental thing that we worry about in our business”.

All our witnesses were particularly concerned that bringing infected plants from abroad could infect UK stock. The UK Plant Health Risk Register contains 1,423 pests and pathogens that have been assessed for the threat they pose to the UK, of which 998 have been spread via live plant movement. Although I agree with the noble Earl, Lord Kinnoull, on grey squirrels, they do not fall within that category.

Fruit trees and bushes and forest trees are particular issues. The Woodland Trust tells us that we import about 19 million forest trees every year and that 20 serious diseases of trees have been identified through imported trees since 1990. That has accelerated the loss of tens of millions of trees. Given the Government’s ambition to plant millions of trees for carbon capture and biodiversity reasons, it is vital that we minimise the risks to the survival of those trees from imported diseases. The Woodland Trust told the committee:

“The single most effective biosecurity safeguard is to reduce the need for imported plants and source all trees for planting in the UK, from stock that has been grown its entire lifespan in GB”.


It suggested to us that an improved labelling system for UK-grown trees would enable consumer confidence that the product they are buying is biosecure and UK-grown for the whole of its lifespan, not imported and just grown on in the UK for a couple of weeks.

For imported plants I know that the Government are working with the Plant Health Alliance on a voluntary certification scheme but, as the noble Lord, Lord Carrington, said, the committee recommended that this be compulsory. However, we felt that more support for compliance would be needed for SMEs in the industry. Both the RHS and the National Trust support the Plant Healthy scheme, but Martin Hillier from Hillier Nurseries told us that the accreditation scheme was a good start but should be compulsory and set at a higher standard.

The Woodland Trust tells us that the overall ambition to reduce reliance on tree imports will be realised only if we invest in the UK nursery sector to equip nurseries with the skills, labour, funding and policies that enable the scaling up of production of UK-grown trees. This will also create green jobs to benefit the local and national economy. The committee agreed with that and called on the Government to improve recruitment of people into horticulture and increase the training opportunities for them, from T-levels in schools to apprenticeships and higher education, as well as careers advice. In addition, the timescales of many growers are long and require long-term planning, which is difficult without a clear UK strategy for horticulture, and preferably a Minister with responsibility for ornamental and environmental horticulture as well as the edibles part of the industry. Will the Minister take this back to the department? Without this support UK growers will struggle, and we will have to rely on imports with all the consequent biosecurity risks.

We also need a high-level quarantine scheme for high-risk hosts based on scientific research. For example, olive trees, which were mentioned by the noble Earl, Lord Cork and Orrery, when infected with Xylella—a serious pest for our native trees—can remain without symptoms for 12 months, so they should be quarantined for at least that length of time. We were promised that that would be explored in the GB plant health strategy, but it has not yet been done. Can the Minister say when it will happen?

Another effect of climate change which impacts UK growers, especially in the south-east, is shortage of water. If the UK horticulture industry is not supported to transition to sustainable water management practices, it will jeopardise our ability to grow our own trees and be self-sufficient. The Plan for Water is welcome but water management in the horticulture sector requires more effort, such as looking at the planning barriers for small reservoirs on growers’ and farmers’ own land.

Horizon-scanning for new and emerging threats, research and risk assessment are essential if we are to keep track of incoming diseases and those that are becoming more prevalent. Here the International Plant Sentinel Network, co-ordinated by the Botanic Gardens Conservation International and supported by Defra, plays a key role. I must declare an interest here as I was the honorary chair of the board of BGCI for 10 years and retain an interest in its work. The IPSN uses plant species held in botanic gardens’ collections outside their natural range as sentinels to gather evidence on new and emerging pests and diseases and novel host-disease interactions that can affect UK biosecurity. It provides an early warning system for emerging pest and pathogen risks and is a pivotal partner in the UK biosecurity strategy, which has been mentioned by many noble Lords.

Tools developed include digital plant health checkers to enable non-specialists to monitor plant health issues. For example, the emerald ash boring beetle, which was mentioned by the noble and right reverend Lord, Lord Chartres, and the noble Earl, Lord Cork and Orrery, is a great danger to our ash trees, and is common in eastern Ukraine and western Russia but fortunately not in the UK—so far. The tool helps people to recognise it to enable early warning in case it comes in on imported plants. Another initiative involved citizen scientists in identifying the sap-sucking insects that can transmit Xylella.

Botanic gardens also use alien plants in their collections to monitor for dangerous pathogens. Related to this work, may I ask the Minister whether there is any consideration of the inclusion of invasive alien plant species in the biosecurity strategy, due to their potential to host key pests and pathogens?

So much of this work depends on data and IT systems. I was therefore concerned when I read that Gareth Davies, chief executive of the National Audit Office, in his annual statement yesterday, said that three-quarters of the Defra IT budget is spent on maintenance of out-of-date IT systems. Given what we know can go wrong when IT systems go wrong, is the Minister confident of the robustness of the department’s disease surveillance system?

Finally, I have one more question, about surveillance of risk. Due to complex and expensive biosecurity regulations related to the movement of plant material nationally and internationally, it is becoming near impossible for scientific institutions to exchange material to support research into pests and diseases. Would the Government consider exemptions for bona fide research institutions contributing to the management and control of plant pests and pathogens?