Abstract
Recent revisions in taxonomy have led to significant changes in our understanding of the Fusarium species associated with sorghum worldwide. To reassess the Fusarium species associated with stalk rot of grain sorghum in Australia, a survey was conducted in two different agroclimatic areas in the northern grain belt of eastern Australia (Goondiwindi and Quirindi). Across three sites in each of the two areas, 288 grain sorghum stalks were sampled from which a total of 324 Fusarium isolates were recovered. Species diversity and eveness was higher in the Goondiwindi area, which is hotter and dryer than the Quirindi area. Fusarium andiyazi and F. thapsinum were the most frequently isolated species overall, comprising 61% and 82% of the isolates from the Goondiwindi and Quirindi areas, respectively. The dominance and relative abundance of these species was associated with agroclimatic areas, with F. thapsinum more abundant in the Goondiwindi area and F. andiyazi more abundant in the Quirindi area. This study represents the first formal report of F. andiyazi and F. thapsinum in Australia.
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