53-mycotoxin-survey-monthly-update-november-2026

Mycotoxin Survey in North America: November 2026 Update

The first update from the 2026 PROcheck mycotoxin survey is here! The 2025 data set has been updated as well as 101 “new” samples were analyzed since the last update that was posted in July. Contact your dsm-firmenich representative to learn how to submit samples for analysis and contribute to the survey.

2026 US and Canada Corn Ingredient Survey Reports

Each sample was tested for 6 major mycotoxin groups including,

A-Trichothecenes (A-Trich): T-2 toxin, HT-2 toxin, Neosolaniol*, Diacetoxyscirpenol
B-Trichothecenes (B-Trich): Deoxynivalenol (DON/Vomitoxin), 3-Acetyl-deoxynivalenol, 15-Acetyl-deoxynivalenol, Nivalenol*, Fusarenon X*
Fumonisins (FUM): B1, B2, B3*
Zearalenone (ZEN)
Aflatoxins (Afla): B1, B2, G1, and G2
Ochratoxin A (OTA)
In Canada, samples are also routinely screened for Mycophenolic Acid (MPA) and Sterigmatocystin (STC).

*Not screened for in Canada

The survey results represent samples sent in for surveillance testing only and does not include any sample submitted following clinical signs.

Below we discuss trends of each of these feed ingredients regarding mycotoxin occurrence. Additional details including mean contamination levels and risk by state or province can be found by downloading the full report.

USA Corn

67 samples submitted from 10 states (2025: 458 samples submitted from 22 states)
Overall occurrence for corn samples:

Occurrence	2026	2025
Total positive	98%	99%
>1 Mycotoxin/sample	72%	85%

Occurrence status by mycotoxin group:

Mycotoxins	2026	2025
A-Trichothecenes	10%	14%
B-Trichothecenes	49%	79%
Fumonisins	93%	79%
Zearalenone	51%	81%
Aflatoxins	4%	5%
Ochratoxin A	13%	3%

Based on the limited dataset of 67 corn grain samples tested to date, surveillance of 2026 crop suggests an increase in the occurrence of Fumonisins (+14% points) and Ochratoxin A (+10% points), while the occurrence of B-Trichothecenes (-30% points) and Zearalenone (-30% point) is decreased, and the occurrence of A-Trichothecenes (-4% points) and Aflatoxins (-1% point) is similar vs. 2025 crop year results.
It is important to keep in mind that as of August 1, 2023, Romer Labs implemented the updated PLUS Method featuring enhanced sensitivity. Changes in laboratory methods including lowered limits of detection (LOD) may influence historical comparisons vs. 2023 through 2026 survey results.

Download US Corn Grain Report

USA Corn Silage

This data set will be updated once more samples are screened as part of the survey.

Canada Corn

This data set will be updated once more samples are screened as part of the survey.

Canada Corn Silage

This data set will be updated once more samples are screened as part of the survey.

Continued monitoring and surveillance of 2026 crop ingredients is warranted to provide on-going characterization of contamination patterns and trends in North America. Keep in mind the potential for storage contamination to increase over time.

Results based on the samples analyzed in the region to date.