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Frequent occurrences of high levels of <i>Fusarium</i> mycotoxins have been recorded in Norwegian oat grain. To elucidate the influence of tillage operations on the development of <i>Fusarium</i> and mycotoxins in oat grain, we conducted tillage trials with continuous oats at two locations in southeast Norway. We have previously presented the content of <i>Fusarium</i> DNA detected in straw residues and air samples from these fields. Grain harvested from ploughed plots had lower levels of <i>Fusarium langsethiae</i> DNA and HT-2 and T-2 toxins (HT2 + T2) compared to grain from harrowed plots. Our results indicate that the risk of <i>F. langsethiae</i> and HT2 + T2 contamination of oats is reduced with increasing tillage intensity. No distinct influence of tillage on the DNA concentration of <i>Fusarium graminearum</i> and <i>Fusarium avenaceum</i> in the harvested grain was observed. In contrast to <i>F. graminearum</i> and <i>F. avenaceum,</i> only limited contents of <i>F. langsethiae</i> DNA were observed in straw residues and air samples. Still, considerable concentrations of <i>F. langsethiae</i> DNA and HT2 + T2 were recorded in oat grain harvested from these fields. We speculate that the life cycle of <i>F. langsethiae</i> differs from those of <i>F. graminearum</i> and <i>F. avenaceum</i> with regard to survival, inoculum production and dispersal.