In all cases, provide precise details of the location and, if possible, clear photographs of the symptoms.
In Northern Ireland, contact the DAERA Plant Health Inspection Branch: tel: 03 e-mail: web: /topics/plant-and-tree-health/about-plant-and-tree-health. In Scotland, contact the Scottish Government’s Horticulture & Marketing Unit: e-mail: tel: 01 web. In England and Wales, contact your local office of APHA’s Plant Health & Seeds Inspectorate, or the PHSI headquarters in York: tel: 0300 1000 313 e-mail: web. However, findings of DNB in trade, such as in nurseries or garden centres, must be reported to the relevant plant health authority. UK foresters are trained to recognise and manage it, so we do not require reports of suspected cases in forests from members of the public. Report a sightingĭNB mostly occurs in managed pine forests. The discoloured trees in the picture above are Corsican pines killed by Dothistroma needle blight.įor further guidance, see Disease symptoms and life cycle of Dothistroma (red band) needle blight . The narrow annual growth rings at the perimeter of the section of log pictured above show the significant reduction in yearly diameter (and therefore timber) increment of Corsican pine caused by Dothistroma needle blight. This defoliation can continue year on year and gradually weaken the tree, significantly reducing timber yields (see picture below) and causing the death of the tree. Spores are released from the fruit bodies during this period, leading to infection of the current year’s needles.Īfter this point, the symptomatic needles are shed, and branches can acquire a ‘lion’s tail’ appearance typical of the disease, with only a tuft of the recently infected current year’s needles remaining at the branch ends. It is within the red bands that the small, black, spore-containing fruit bodies tend to be found, with symptoms being most apparent in June and July. Then, as the disease progresses, the ends of the needles turn reddish-brown while the needle base remains green. Infected needles typically develop yellow and tan spots and bands, which soon turn red. 
Symptoms are first seen at the base of the crown on older needles. muricata).Īs of 2022, trees in the other main conifer genera used in British forestry, such as larches ( Larix species), firs ( Abies spp.), hemlocks ( Tsuga spp.), spruces ( Picea spp.) and Douglas fir ( Pseudotsuga menziesii), continue to appear to have low susceptibility. In the UK it has been found on Corsican or ‘black’ pine ( P. Susceptible speciesĭNB is mostly a disease of pine trees. It is caused by the fungus Dothistroma septosporum (D. Distributionĭothistroma needle blight (DNB) is an economically important disease of conifer trees (trees with cones and needles), and particularly pines (trees in the Pinus genus). It is also known as red band needle blight because of the colourful symptoms it shows on pine trees, as in the picture above.Ī very similar disease can be caused by a related pathogen (disease-causing organism) called Dothistroma pini, but this is not thought to be present in the UK.
It causes premature needle defoliation, resulting in loss of timber yield and, in severe cases, tree death. Scientific name of causal agent – Dothistroma septosporumĭothistroma needle blight (DNB) is an economically important disease of conifer trees (trees with cones and needles), and particularly pines (trees in the Pinus genus). Reportable in trade – see ‘Report a sighting’ below
0 kommentar(er)
