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Larch Disease

I congratulate my hon. Friend the Member for Tiverton and Honiton (Neil Parish) on bringing this important issue to the attention of the House. I am happy to confirm that when I took responsibility as the forestry Minister almost a year ago and was apprised of the issue, I quickly realised its importance and the potential severity of its impact on the UK's forests. It is right that a year on, we should be having a debate, albeit a short one, about Phytophthora ramorum, particularly in the south-west. As my hon. Friend said, the disease was first identified in rhododendrons in this country in about 2002. It was not until 2009 that it appeared to jump species into the Japanese larch. It has appeared in other species—in Ireland it has been found in Sitka spruce—but apparently, in all such instances, the individual tree has been surrounded by highly infected rhododendron, which shows the impact of the spores. Touch wood—perhaps that is an unfortunate phrase—there is no sign that the disease is openly jumping to other species, but that is clearly the big worry. As my hon. Friend rightly said, the matter does not affect only state forests. The vast majority of England's forests, 80%, are not state-owned, so private forests have a serious role to play. I am sure that he will pass on my thanks to those in his constituency for how private landowners have joined the Forestry Commission and the Food and Environment Research Agency to combat the threat of Phytophthora ramorum. My hon. Friend asked what we are doing in the widest context. I will try to address that first. DEFRA's chief scientific adviser, Professor Bob Watson, is advising us on the issues, opportunities and priorities for new research, working with others to ensure that outputs have maximum impact on what we can do and working with the Forestry Commission, FERA and the wider scientific community to develop further our strategic approach to existing and emerging plant pests and diseases, which are not unique to this country. There is an international perspective as well. That work is setting out an agenda wider than Phytophthora ramorum to minimise the risk of new threats entering the UK, to enable us to understand more about the threats that we face, to work with society to make it more aware of threats, pathways and the risks of bringing in infection and to identify positive actions that those who manage our trees, woodlands and forests can take to improve their resilience. In addition, Forest Research, the research agency of the Forestry Commission, is, like every other public body, going through its own spending review. It has decided, rightly, to reprioritise its research work. As part of that, programmes such as biosecurity will be increased and the budget maintained. As my hon. Friend has said, Phytophthora ramorum is not unique to this country. We do not know exactly how it came in, but it is believed to have probably come from some infected plant importation. It exists in 15 European Union member states and, as he has pointed out, the United States. In the UK, it was initially in rhododendron and the whole of that species, and it then jumped into Japanese larch. It is not so much that this is a disease of the south-west, but it appears to be a disease of larch, which is a particularly common species in the south-west—particularly Japanese larch—for the commercial reasons to which my hon. Friend has referred. Larch is an important forestry species in the south-west and in parts of Wales and the rest of England. The disease has, as my hon. Friend has said, also been found in European larch in Cornwall. I have asked whether that indicates that European larch is any more resistant, but we just do not know. It is probably because there are far more Japanese larch than European larch in the south-west. On the Government's strategy, whether it relates to the Department for Environment, Food and Rural Affairs or the Forestry Commission, to deal with Phytophthora ramorum, our overall strategy on the fungal pathogen, which is the disease under discussion, is to reduce the pathogen inoculum—in other words, the spores that are produced—to an epidemiologically insignificant level by removing sporulating host plants from high risk areas. The aim is to reduce the risk of significant tree death and other impacts. In plain English, our policy is to cut them down as quickly as possible. The point is that, while the tree is alive and standing in the wind, the fungus is sporulating and the spores spread considerably. The sooner the tree is cut down and dies, the less risk. Although the tree being on the ground and dead does not remove all risk, it dramatically reduces it. That is the fundamental objective—cut them down as soon as possible. I should say that the timber from such trees is perfectly okay. The timber itself does not carry any disease. The bark and any foliage, however, are more risky. Bark can be burnt and used for incineration for power generation and heat and so on, but it cannot be used for mulch purposes, because of the risk that it contains disease. Small trees and useless stuff are left on the ground, because it is not cost-effective to remove them for the small risk. Once they are on the ground, the risk is much lower. That is the layman's approach to what is happening, which is important.