Canadian Forest Service Publications

Studies of Hypodermataceous needle diseases. I. Isthmiella quadrispora sp. nov., causing needle blight of alpine fir. 1968. Ziller, W.G. Canadian Journal of Botany 46(11): 1377-1381.

Year: 1968

Issued by: Pacific Forestry Centre

Catalog ID: 27925

Language: English

Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.1139/b68-187

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A new parasite causing needle disease of alpine fir (Abies lasiocarpa (Hook.) Nutt.) in western Canada and named Isthmiella quadrispora sp. nov. is illustrated and described. It resembles I. faullii (Darker) Darker in morphology, pathogenicity, life cycle, host range, and associated fungi; but differs from I. faullii in its apparent lack of an imperfect state, the subcuticular position of its ascomata, its stipitate, narrow, four-spored asci, and the germination of its spores. Field observations indicate a 2-year life cycle and great differences in susceptibility of individual host trees. Several secondary associated fungi prevent spore formation of I. quadrispora, thus acting as biologic control agents.