A newly discovered serotype of Gremmeniella abietina

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Abstract
The Asian, European and North American serotypes of G. abietina [described as causing a serious canker or dieback disease of red pine (Pinus resinosa Ait.) and jack pine (P. banksiana Lamb.) in North America] were compared with 27 Vermont [USA] isolates using gel double diffusion and intragel cross absorption tests. An intermediate serotype, between the North American and European serotypes, was shown by means of cross absorption with antiserum prepared in response to a Vermont isolate. The majority of Vermont isolates resembled the Vermont intermediate in serological reaction, 3 resembled the European serotype, and 2 were of unknown serotypes. The serological data support possible hybridization between G. abietina isolates in Vermont as well as the identification of a new serotype in Vermont.