THE OCCURRENCE OF FUSARIUM SPECIES IN CANADA: V. TAXONOMY AND GEOGRAPHIC DISTRIBUTION OF FUSARIUM SPECIES IN SOIL

摘要

A taxonomic study was made of 1348 isolates ofFusariumfound in 206 soil samples collected in 1946. Approximately 70 of the samples, or 143, were obtained from 127 localities in Manitoba; the remaining 30, or 63, came from seven other provinces.Of 25,973 colonies of fungi that developed on the 2060 soil-dilution plates involved in this study,Fusariumaccounted for approximately 5. A total of 14 species and varieties ofFusarium, classified in nine sections of the genus, were isolated; they areF.merismoidesCda.,F.poae(Pk.) Wr.,F.sporotrichioidesSherb.,F.avenaceum(Fr.) Sacc.,F.semitectumBerk. amp; Rav.,F.acuminatumEll. amp; Ev.,F.equiseti(Cda.) Sacc.,F.culmorum(W. G. Sm.) Sacc.,F.sambucinumFuckel,F.sambucinumvar.coeruleumWr.,F.moniliformeSheld. emend. S. amp; H.,F.oxysporumSchlecht. emend. S. amp; H.,F.oxysporumvar.redolens(Wr.) Gordon,F.solani(Mart.) App. amp; Wr. emend. S. amp; H.F.oxysporum,F.oxysporumvar.redolens,F.equiseti, andF.solaniaccounted for approximately 90 of the totalFusariumisolates.F.oxysporumwas by far the most prevalent species isolated. With the exception ofF.merismoides, all of the species isolated were found previously to be seed-borne by cereals and to be associated with common root rot of those crops.