Larch Disease

Sarah Wollaston Excerpts

Tuesday 3rd May 2011 Westminster Hall

[Neil Parish (Tiverton and Honiton) (Con)]

It is very nice to have this debate under your chairmanship, Ms Dorries, and it is nice to see the Minister with responsibility for agriculture here.

There is an insidious disease hitting the south-west that, if swept under the carpet, could decimate some of our most treasured ancient woodland, and cost many of the green jobs in the forestry sector that are vital to the rural economy and to the maintenance of our environment. Phytophthora ramorum is a fungus-like pathogen that is causing extensive damage and mortality to plants and trees. In particular, it has infected commercial softwoods such as Japanese larch in the south-west of England and south Wales. It was unknowingly spread by plant movements of ornamental rhododendrons to gardens across the UK.

In 2000, Forestry Commission scientists found similarities between a pathogen that had been causing leaf blotch and dieback in rhododendrons in nurseries in Germany since the early 1990s, and a pathogen in California—and subsequently in Oregon—that had caused the death of more than 1 million oak trees since its symptoms were identified in the US in 1994, gaining it the name, “sudden oak death.” In Japanese larch, the symptoms are that shoots and foliage can be affected and are visible as wilted, withered shoot tips with blackened needles, with the infected shoots shedding their needles prematurely. Trees with branch dieback may have numerous cankers on their branches and upper trunk that can bleed resin.

It is now known that Japanese larch, when actively growing in spring and summer, can produce very high quantities of disease-carrying spores, at much higher levels than those produced by rhododendrons, and they can be spread across significant distances in moist air. In August 2009, the pathogen was found to have infected Japanese larch trees at sites in Somerset, Devon and Cornwall, which was an unexpected change in its behaviour. More recently, in March 2011, the disease was found in the European larch in woodlands near Lostwithiel in Cornwall. The fact that this lethal pathogen has now proved capable of infecting yet another species is a worrying development and a setback in tackling the disease, but given the similarities between the two species, experts were not surprised.

Regarding the threat to the industry, as of January 2011 some 138 statutory plant notices had been issued in the UK requiring trees to be felled due to infections on some 2,200 hectares. An estimated 1,745 hectares in the south-west are affected by the disease. That is a grave threat to our woodlands and to the 2,220 people who are employed in primary production and processing. The 15,000 green jobs in the south-west supported by the forestry sector are under threat.

Japanese and European larch, the primary victims of the disease in the south-west, are extensively used in the manufacture of garden furniture, fencing and pallets, and their value to the south-west’s economy has been estimated at £47 million. Wood prices have been hit, with landowners estimating that the disease outbreak has seen larch prices fall by 35%. Over-supply, the cost of bio-security measures and the need for the diseased timber to be handled carefully only at licensed mills has also affected profitability.

Current actions by the Food and Environment Research Agency include a strategy to control and contain the disease, reducing levels of the infective spores in the environment by felling infected plantings of the principal host—Japanese larch—as rapidly as possible. FERA is also continuing its programme of clearing infected rhododendrons from woodland and other sites. There is also an aerial survey programme in the south-west, Wales and western Britain, where the climate favours the disease, to identify possible sites of infected larch, which is then followed by contact with owners, site visits to check symptoms and laboratory testing to confirm the presence or otherwise of the disease. When the disease is confirmed, there is a programme of clearance on both private and publicly owned sites and the development of a package of short-term help for private woodland owners affected by the disease, which includes a licence system to enable the movement and processing of timber from affected larch.

Other actions include continued scientific research better to understand the disease and the overall risks to our trees, woods and forests, including the potential impacts on the UK forestry sector and its associated industries; a further survey of rhododendrons by FERA, followed up with funded rhododendron clearance agreements when appropriate; and, very importantly, encouraging owners to check their woodland, especially larch plantings, for signs of the disease and to report suspicious symptoms promptly. Owners have a legal obligation under plant health legislation to notify the authorities if they suspect that the disease is present.

Regarding the effect on the forestry industry and the Confederation of Forest Industries, felling diseased larch has accelerated the loss of productive softwood forest, and the area of such forestry is already in decline, with new planting falling to match ongoing losses. A report by South West Woodland Renaissance, a coalition of 35 sawmillers and woodland owners, warned:

“The forecast total softwood availability from the current potential productive growing stock is forecast to decrease”

by up to 50%. The loss of larch trees has caused the acceleration of lost softwood forestry, undermining local green jobs and damaging efforts to reduce carbon emissions and develop a low-carbon economy.

I turn to the felling of diseased larch and replanting. Many landowners are concerned about the considerable cost of clearing woodland of infected trees, and also that the lack of support for woodland creation is inadequate and the resource is diminishing, especially with the value of larch trees going down due to so many of the trees having to be cut down because of the disease. There is a huge disparity in the current grant system, with the grant rates providing a higher contribution to the cost per hectare of planting broadleaves than softwood, and providing no grant at all for replanting softwood in protected ancient woodlands.

[Dr Sarah Wollaston (Totnes) (Con)]

May I back that up by talking about the experience of my constituent, Mr Rob White, who has lost 20 hectares of his Japanese larch under a compulsory felling notice? He is on a planted ancient woodland site and only 50% to 70% of his replanting costs would be covered—even if he planted wholly broadleaf species—and he is seriously considering the extent to which he will replant. He would, of course, like to use his common sense and replant a range of species; he has talked to me about replanting Sitka spruce and Douglas fir, which are relatively disease-resistant, and he would also like to mix in some broadleaf species. Does my hon. Friend feel that we should trust our constituents to use their common sense in that regard?

[Neil Parish]

My hon. Friend is absolutely right. We have to use our common sense and bring a mixture of trees back into these ancient woodlands, which have suffered from the destructive larch disease. From my farming background, I know that the greater the spread of varieties of tree, the lower the chance of spreading the larch disease that might still be there. I am sure that the Minister heard exactly what my hon. Friend said, and it will be interesting to see whether the Department for Environment, Food and Rural Affairs can come up with a solution whereby we can get the forests replanted, especially the very valuable ancient woodland.