Marssonina leaf spot

Marssonina leaf spot - <em>Marssonina castagnei</em>, a causal agent of Marssonina leaf spot, on the surface of a European white poplar leaf.
  • Latin name: Marssonina populi (Lib.) Magnus
  • French name: Tache marssoninéenne
  • Division: Deuteromycotina
  • Class: Coelomycetes
  • Synonym(s): Drepanopeziza populorum (Demaz.) Höhn.,
    Gloeosporium populi (Lib.) Mont. & Desmaz.
Description

Micro-habitat(s)

Leaf

Distribution

Canada

Damage, symptoms and biology

Diffuse orange-brown spots, 2-5 mm diameter, coalesce into vein-limited blotches.

Small spots scattered on the host are of little consequence, but a serious infection can cause severe, premature defoliation. Repeated defoliation causes weakening and dieback of poplars.

Other information

Drepanopeziza populorum is the sexual stage (teleomorph) of Marssonina populi.

Canadian Forest Service Publications

Marssonina leaf spot

Information on host(s)

Main host(s)

Black cottonwood, largetooth aspen, plains cottonwood, poplars / aspens / cottonwoods, trembling aspen

Photos
  • Marssonina leaf spot Leaf spot symptoms on hybrid poplar caused by Marssonina populi
  • Marssonina leaf spot Fruiting bodies of Marssonina castagnei, a causal agent of Marssonina leaf spot, on the lower surface on a European white poplar leaf.
  • Marssonina leaf spot Marssonina castagnei, a causal agent of Marssonina leaf spot, on the surface of a European white poplar leaf.
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