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(...) All species found in northern states also were found in southern states, although differences in tissue, debris, and soil populations were observed. All species were recovered from at least one Alfisol site, and all but F. avenaceum were recovered from at least one Ultisol site. (...) The distribution of Fusarium spp. observed in this study is consistent with the hypothesis that these fungi are widely distributed in host tissue under field conditions and that they respond to stress in the plant by taking advantage of preferential growth conditions to incite disease
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John F. Leslie (1990) studied this question.
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