Fusarium species in underground tissue of pulse, oilseed, and cereal crops grown in southeast Saskatchewan
A total of 643 cereal, oilseed and pulse crops were sampled in southeast Saskatchewan in 2000 and 2001 for Fusarium populations in underground living tissue. Many of the Fusarium spp. isolated from discolored roots/subcrown internodes had also been isolated from cereal heads affected by Fusarium head blight (FHB) in Saskatchewan. The most abundant Fusarium spp. were F. avenaceum and F. equiseti. F. avenaceum was present at the highest level in pulse, particularly lentil. Other species present at lower levels in both cereal and non-cereal tissue were F. acuminatum, F. culmorum, F. graminearum and F. sporotrichioides. When fungal populations in discoloured subcrown internodes of wheat and barley were analyzed according to crop history, it was found that a preceding non-cereal crop did not change the percent isolation of most species, including the cereal pathogens F. culmorum and F. graminearum. Furthermore, in most cases the percent isolation of total Fusarium spp., particularly that of F. avenaceum, was higher when wheat or barley were preceded by a non-cereal crop than when preceded by another cereal crop or summerfallow. This is the first report of isolation of F. graminearum, the main causal agent of FHB in North America, from roots of field-grown pulse and oilseed crops in western Canada.
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