Abstract
Mycotoxins continue to represent one of the most significant biological hazards in global food and feed supply chains. Climate variability, changing agricultural practices, and increasingly complex international trade networks have heightened the risk of mycotoxin contamination in cereals, oilseeds, nuts, and other agricultural commodities. As the 2026 harvest season approaches, proactive testing strategies are essential to ensure compliance with regulatory limits, protect animal and human health, and minimize economic losses. This article reviews the expected mycotoxin risks for the 2026 harvest and presents practical testing strategies for producers, processors, traders, and feed manufacturers.
Introduction
Mycotoxins are toxic secondary metabolites produced by fungi, primarily species belonging to the genera Aspergillus, Fusarium, and Penicillium. These compounds can contaminate crops in the field, during harvest, transport, and storage. The most economically significant mycotoxins include aflatoxins, deoxynivalenol (DON), zearalenone (ZEN), fumonisins (FUM), ochratoxin A (OTA), T-2 toxin, and HT-2 toxin.
The global impact of mycotoxin contamination is substantial. Beyond direct yield losses, contamination can lead to rejected shipments, reduced animal performance, food recalls, and significant reputational damage. Regulatory authorities worldwide continue to tighten monitoring requirements, increasing the need for robust testing programs throughout the supply chain.
Mycotoxin Risk Outlook for the 2026 Harvest
Impact of Climatic Conditions
Climate conditions observed during the 2025/2026 growing season suggest elevated mycotoxin risks in several agricultural regions. Increased frequency of:
- Heat stress periods
- Heavy rainfall events
- Extended humidity during flowering
- Delayed harvest conditions
can create favorable environments for fungal growth and toxin production.
Key Mycotoxins of Concern
Aflatoxins
Aflatoxins remain the most toxic and tightly regulated mycotoxins globally. Produced primarily by Aspergillus flavus and Aspergillus parasiticus, aflatoxins are increasingly detected in maize, peanuts, tree nuts, spices, and other commodities grown under warm and drought-stressed conditions.
Particular attention should be paid to:
- Southern and Eastern Europe
- Mediterranean regions
- North Africa
- Areas experiencing prolonged drought followed by rainfall
Fusarium Mycotoxins
Fusarium toxins remain a significant concern in wheat, barley, oats, and maize.
Key compounds include:
Wet weather during flowering and grain filling stages significantly increases infection risk and subsequent toxin production.
Emerging and Masked Mycotoxins
Growing evidence indicates that masked mycotoxins and emerging metabolites may contribute to overall toxicological burden. Although regulatory frameworks are still evolving, analytical laboratories increasingly include these compounds in comprehensive surveillance programs.
Why Testing Is Essential
Food and Feed Safety
Mycotoxins are associated with numerous adverse health effects including:
- Hepatotoxicity
- Nephrotoxicity
- Immunosuppression
- Reproductive disorders
- Carcinogenicity
Aflatoxin B1 is classified as a Group 1 human carcinogen by the International Agency for Research on Cancer (IARC).
Regulatory Compliance
The European Union, United States, China, and many other jurisdictions maintain strict maximum levels for key mycotoxins. Non-compliant lots may result in:
- Shipment rejection
- Import restrictions
- Product recalls
- Financial penalties
Economic Protection
Early detection enables segregation of contaminated lots before they enter processing streams, reducing downstream costs and protecting product value.
Recommended Testing Strategies for Harvest 2026
1. Risk-Based Sampling
Sampling remains the most critical step in mycotoxin testing.
Because mycotoxins are heterogeneously distributed, poor sampling can introduce greater analytical error than laboratory testing itself.
Recommended practices include:
- Collection of multiple incremental samples
- Representative composite sampling
- Compliance with EU Regulation (EU) 2023/2782 and relevant national standards
- Increased sampling frequency for high-risk regions and commodities
2. Rapid Screening at Intake
Rapid lateral flow and quantitative immunoassay technologies provide immediate decision-making capability at grain reception points.
Benefits include:
- Results within minutes
- Reduced storage of suspect lots
- Immediate segregation decisions
- Lower overall testing costs
Recommended targets:
3. Laboratory Confirmation
High-risk or positive screening samples should undergo confirmatory testing.
Preferred analytical methods include:
- LC-MS/MS
- HPLC-FLD
- UHPLC-MS/MS
These techniques provide:
- High sensitivity
- Multi-mycotoxin capability
- Regulatory-grade documentation
- Quantification of emerging toxins
4. Multi-Mycotoxin Surveillance Programs
Contamination rarely involves a single toxin.
Modern testing programs should monitor:
| Commodity | Recommended Analytes |
|---|---|
| Maize | Aflatoxins, DON, FUM, ZEN |
| Wheat | DON, ZEN, T-2, HT-2 |
| Barley | DON, ZEN, OTA |
| Oats | T-2, HT-2, DON |
| Animal Feed | Full multi-mycotoxin panel |
5. Storage Monitoring
Testing should not end at harvest.
Post-harvest monitoring should include:
- Moisture control
- Temperature surveillance
- Periodic mycotoxin verification
- Testing before shipment and processing
Storage-related fungal growth can significantly increase contamination levels after harvest.
Integrated Mycotoxin Management Approach
Testing should form part of a broader risk management framework including:
Pre-Harvest Measures
- Selection of resistant varieties
- Crop rotation
- Fungicide programs where appropriate
- Timely harvest
Harvest Controls
- Moisture assessment
- Removal of damaged kernels
- Segregation of suspect lots
Post-Harvest Controls
- Rapid drying
- Aeration
- Continuous monitoring
- Routine testing
Combining preventive measures with analytical verification provides the highest level of protection against mycotoxin-related losses.
Conclusion
The 2026 harvest is expected to present significant mycotoxin challenges driven by increasingly variable climatic conditions and evolving regulatory expectations. Aflatoxins, Fusarium toxins, and emerging mycotoxins remain critical hazards requiring proactive management. Organizations throughout the food and feed chain should implement risk-based sampling, rapid screening technologies, confirmatory laboratory analysis, and continuous storage monitoring. Such integrated testing strategies are essential for ensuring regulatory compliance, protecting public health, and safeguarding the economic value of agricultural commodities.
Keywords
Mycotoxins, Harvest 2026, Aflatoxin Testing, DON, Zearalenone, Fumonisins, Food Safety, Feed Safety, Grain Testing, Risk Management, LC-MS/MS, Rapid Screening, Agricultural Commodities
