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<div>Fusarium head blight (FHB), caused by <i>Fusarium graminearum</i>, is associated with wheat grain contamination with harmful mycotoxins such as deoxynivalenol (DON). Although FHB is a good indicator of DON, this relationship breaks down under certain weather conditions. One possible explanation for this could be the conversion of DON to DON-3-Glucoside (D3G), which is often missed by common DON testing methods. An experiment was conducted to investigate the effects of rainfall patterns on DON-D3G conversion in wheat grains. Separate replicate plots with different levels of FHB were subjected to one of six rainfall treatments: rainfall every day (Rain1); every other day (Rain2); two days with, two days without rainfall (Rain3); three days with, three days without rainfall (Rain4); four days with, five days without rainfall (Rain5); and no supplemental rainfall (check). There was a significant positive relationship between DON and D3G. Rain1 resulted in significantly higher mean D3G than the other treatments. Rain4 resulted in higher mean D3G than Rain2, Rain3, and Rain5. All rainfall treatments induced sprouting, as indicating by low falling number (FN). Rain1 consistently had the lowest mean FN, whereas Rain4 resulted in significantly lower mean FN than the other intermittent rainfall treatments. There was a significant positive relationship between DON-D3G conversion (based on D3G/DON ratios) and sprouting. This study is the first to associate DON-D3G conversion to pre-harvest rainfall patterns and sprouting, and provides new information that is invaluable for understanding this complex disease-toxin system.</div>