Later harvest time increased the infection of stems by Fusarium spp. and plant lodging. With the delay of harvest, the dry matter content in grain increased, but the crop in the later periods decreased. The optimal harvest time seems to be 20 days after reaching physiological maturity. In spite of using different genotypes and a wide range of harvest dates, the chemical analysis used to determine the presence of trichothecens B (DON, 3-AcDON, 15-AcDON and NIV) did not reveal their presence above the detection limit 0,001 mg/kg.