Mycotoxin Survey in US corn: February 2019 update

Corn

  • 98% of ground corn samples were positive for at least one mycotoxin, vs 89% in 2017
  • 72% of samples had more than one mycotoxin, vs 47% in 2017
  • Aflatoxin prevalence in dry corn jumped to 10% vs 4% in 2017, with average contamination levels increasing nearly five-fold
  • Deoxynivalenol (vomitoxin) prevalence was 74% vs 70% in 2017, with average contamination level increasing by 41%
  • Fumonisin prevalence has increased to 78% vs 52% in 2017, with average contamination levels increasing by 40%
  • Zearalenone prevalence has jumped to 43% vs 25% in 2017, with average contamination levels remaining steady

Corn By-Product

  • 95% of samples were positive for at least one mycotoxin, vs % in 2017
  • 90% of samples had more than one mycotoxin, vs 94% in 2017
  • Aflatoxin prevalence is 2% vs. 9% in 2017, both years with similar and low contamination levels
  • Deoxynivalenol (vomitoxin) prevalence is 93% vs 99% in 2017, with average contamination level increasing by 34%
  • Fumonisin prevalence is 87% vs 91% in 2017, with average contamination levels decreasing by 20%
  • Zearalenone prevalence is 84% vs 80% in 2017, with average contamination level increasing over two fold

Corn Silage

  • 98% of samples were positive for at least one mycotoxin, vs 91% in 2017
  • 72% of samples had more than one mycotoxin, vs 30% in 2017, a drastic increase in co-contamination
  • Aflatoxin prevalence is 1% with low average contamination levels
  • Deoxynivalenol (vomitoxin) prevalence is 83% vs 85% in 2017, with average contamination level increasing by 81%
  • Fumonisin prevalence was 32% vs 12% in 2017, with average contamination levels increasing by 25%
  • Zearalenone prevalence was 55% vs 26% in 2017, with average contamination level nearly doubling

These contamination levels present MEDIUM to HIGH risk for all livestock and poultry species depending on toxin and feed ingredient type. Overall, producers in the Midwest should be on the lookout for the impacts from deoxynivalenol and zearalenone, while Southern states should be vigilant regarding fumonisin and aflatoxin contamination.