Canadian Forest Service Publications

Inoculation and development of Eutypella canker of maple. 1971. Lachance, D. Canadian Journal of Forest Research 1(4): 228-234.

Year: 1971

Issued by: Laurentian Forestry Centre

Catalog ID: 15424

Language: English

Availability: PDF (request by e-mail)

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Possible ways by which infection with Eutypella parasitica can occur on sugar and red maple were investigated using various artificial infection courts and different inocula. Close to 50% of wound-inoculated sugar maple trunks became infected, using either mycelium or ascospore inoculum. Red maple was much less susceptible to infection than sugar maple as only 6% of the tests were positive. Fifteen to 25% of sugar maple branches, 0.25 to 0.5 in. (0.6 to 1.2 cm) in diameter, inoculated with ascospore suspension, became infected when they had received one of the following wounds: knife cut, bruised bark, or incomplete breakage of the branch. No infection occurred when inoculations were attempted at axils of nonwounded 1- to 20-year-old twigs. On many successful trunk inoculation, a slight swelling of the stem and the characteristic mycelial fans of the fungus under the bark were observed 2 years after inoculation. Where rapid extension of the canker occurred, the initial advance of the fungus was in the bark tissue and subsequently in the underlying cambium and xylem. This fungus development corresponds to that observed in naturally infected trees.