Red Band Needle Blight DNB
Red Band Needle Blight DNB
Red Band Needle Blight DNB Dothistroma - Symptoms and Treatment
Scots Pine

Dothistroma (red band) needle blight - Symptoms Treatment and Management

Dothistroma septosporum is the fungal pathogen which causes Red Band Needle Blight, aka Dothistroma Needle Blight aka DNB. It infects many conifer species around the world but Pine is the most common host. In the UK, it mainly effects Corsican, Lodgepole and Scots Pine. Needle loss progress year on year, weakening the tree, and eventually leading to death. It is a disease which needs careful monitoring and management because of the economic deviation it could potentially cause

Red Needle Blight has caused considerable devastation in the USA, and the video below, produced by Ohio State University, gives an overview of the disease.

Red Band Needle Blight - Symptoms

  • Symptoms will first appear ar the crown base on older needles
  • Needles develop yellowish spots and bands which turn red
  • The ends of the needles turn reddish-brown
  • The red bands contain black spore fruit bodies (June/July)
  • When the spores are released they infect the tree's needles
  • The old infected needles then fall out
  • This process progress year on year
  • The tree will eventually die

How We Can Help

if you suspect a case of Red Band Needle Blight in any trees you are responsible for, contact us immediately. We will make a positive identification and recommend treatment and management strategies.

On individual trees, small populations of woodland trees, amenity situations and nurseries, it may be possible to use a copper based fungicide to treat and suppress the infection. This will of cause depend on the impact of the fungicide on the surrounding environment and it is not always the ideal solution. Fungicidal treatment in large populations of forestry trees is not recommended due to environment and cost considerations. An alternative strategy is to ensure that infected woodland is kept well thinned to ensure good air movement between trees. This reduces humidity levels in the tree canopy minimising the impact of infection.

PDFDownload the Red Band Needle Blight Field Guide produced by the Forestry Commission.

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