Aspen Bibliography

A Canker Disease of Poplars Caused by a New Species of Neofabraea

G.E. Thompson

Document Type

Article

Journal/Book Title/Conference

Mycologia

Volume

31

First Page

455

Last Page

465

Publication Date

1939

Abstract

  1. A canker disease affecting trees of Populus grandidentata, P. tacamahaca, and P. tremuloides was found in the Temagami Forest Reserve, Ontario, Canada.
  2. The fungus causing the disease is described as Neofabraea Populi. Its conidial stage is a member of the form genus Myxosporium.
  3. The fungus was isolated from ascospores, conidia and tissue plantings from the diseased bark and grown on various media. The cultures derived from these sources were similar to one another.
  4. The optimum temperature for growth of the fungus was found to be approximately 18° C. Some growth occurred at 37deg; and at 27° C.
  5. Apothecia were developed in pure cultures on cornmeal agar. Both single and polyascosporic isolations produced apothecia in about forty-five days when grown at a temperature of 15° C.
  6. The pathogenicity of the fungus was demonstrated by artificial inoculations made to small trees of Popuhis grandidentata. The fungus was re-isolated in pure culture.

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