Scleroderris canker, European strain

Disease type
  • Latin : Gremmeniella abietina var. Eu (Lagerberg) Morelet
  • English: Scleroderris canker, European strain
  • French: Chancre scléroderrien, race européenne
  • Subdivision: Ascomycota
  • Order/Class: Helotiales
Description

Distribution

Eastern Canada

Micro-habitat(s)

Branch

Damage, symptoms and biology

Serious disease in natural forests, plantations and nurseries. There are two strains of the causal fungus in eastern North America, the American strain and the European strain, which is more virulent. In both cases, infection begins with a browning of the needles, which kills the buds on the affected shoot. The infection spreads along the shoot, which turns greenish yellow and dies. Infections caused by the American strain are generally limited to the first 2 m of the stem, whereas the European strain causes infections that can invade the whole crown. A canker forms when the disease reaches the trunk. This disease is rarely fatal when caused by the American strain of the fungus; however, under favourable conditions, the European strain can kill affected trees over a few years.

Comments

Although large trees affected by the American strain rarely die, they supply spores that allow the disease to spread.

Other resources

Information on host(s)

Main host(s)

Eastern white pine, jack pine, red pine

Photos
  • Gremmeniella abietina var. Eu (Lagerberg) Morelet

    Damaged pine

  • Gremmeniella abietina var. Eu (Lagerberg) Morelet

    Moribund pine stand

  • Gremmeniella abietina var. Eu (Lagerberg) Morelet

    Red pine infected with the European race of Gremmeniella abietina, the cause of Scleroderris canker.

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