Leaf blight (Ventura populina)

Leaf blight  (<em>Ventura populina</em>) - Defoliation caused by <em>V. populina</em>
  • Latin name: Venturia populina (Vuill.) Fabric.
  • French name: Brûlure des pousses à Venturia populina
  • Division: Ascomycota
  • Class: Pleosporales
  • Synonym(s): Didymospharia populina Vuill.,
    Pollaccia elegans Servazzi
Description

Micro-habitat(s)

Annual shoot, Leaf

Distribution

Canada

Damage, symptoms and biology

In the spring, the ascospores cause primary infection on the tips of leaves emerging from the buds near old dead shoots infected the previous year.

In eastern Ontario, the primary cycle begins in about late May and the secondary cycle in about early June. The twigs are infected in June and immature perithecia can be found on scorched shoots in early August. Mature ascospores are released early the following spring.

This disease is most severe in young stands, and has the greatest impact in intensively managed plantations.

Other information

Pollaccia elegans is the asexual stage (anamorph) of Venturia populina.

Canadian Forest Service Publications

Leaf blight (Ventura populina)

Information on host(s)

Main host(s)

Balsam poplar, hybrid poplar, largetooth aspen, Lombardy poplar, trembling aspen

Secondary host(s)

Eastern cottonwood

Photos
  • Leaf blight  (<em>Ventura populina</em>) Defoliation caused by V. populina
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