Monday Mycotoxin & Crop Report for August 10, 2026

Welcome to this week’s edition of the Monday Mycotoxin & Crop Report!

This report serves as a bi-weekly update for crop conditions, weather outlook, and mycotoxin levels. Information is sourced from the USDA, NIDIS, and US Wheat and Barley Scab Initiative.

As the season progresses, we will continue to monitor weather conditions for likelihood of toxin contamination, and report on verified levels of toxin from the field.

1. Winter wheat harvest is nearing completion nationwide, with 86% harvested and harvest progress at or beyond 95% in most major producing states.  
2. Corn development continues ahead of historical averages, with 90% of the crop silking and 43% reaching the dough stage. National crop conditions declined slightly from the prior week.  
3. Spring wheat and barley have largely reached heading, while harvest activity has begun in both crops.  

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Weekly Weather Summary

Weather conditions varied across the US. Warmer weather was observed across the Rockies, Great Plains and upper/middle Mississippi Valley, while temperatures in the eastern region were average or slightly below average. Dry conditions continued across the central and southern Plains, while increased precipitation was recorded across areas of the northern Plains, Ohio Valley, upper Mississippi Valley, and northern Atlantic states. 

As major risk windows for mycotoxins within the growing season have passed, recent weather conditions primarily affect further development in crops and fieldwork.  

Crop Progress & Condition Overview

• Winter wheat - Winter wheat harvest in the nation has reached 86% completion by August 2, matching the five-year average. Harvest is progressing rapidly in remaining areas and has surpassed 95% completion in states with the highest volumes of winter wheat acreage.    
  
  With harvest nearly complete, monitoring continues for any emerging reports of DON or other mycotoxin concerns. While much of the crop matured under widespread drought pressure, isolated regions that received timely precipitation during critical development periods should still be observed as grain quality data becomes available. States at highest risk for DON or zearalenone are Pennsylvania, New York, Michigan, Ohio, Montana, North Dakota and South Dakota. 
  
  
• Corn – 90% of corn has reached the silking stage, 3 percentage points ahead of the five-year average, 43% of corn has entered the dough stage, five points ahead of average, and 6% has reached the dent stage. National condition ratings declined to 61% good-to-excellent, 2 points below the previous week and 12 points below the same time last year. The following states have pockets of corn that are behind the national average of very poor and poor condition: Colorado, Kansas, Nebraska, North Carolina, North Dakota, South Dakota and Texas.
  
  Above-normal temperatures and below-normal precipitation continue across much of the Great Plains and central production areas, maintaining stress conditions that can elevate aflatoxin and fumonisin risk. At the same time, portions of the northern Plains, Ohio Valley, and upper Midwest experienced meaningful rainfall, creating localized environments that may warrant continued monitoring for DON and zearalenone development as grain fill progresses. 
  
  
• Spring Wheat –  98% of the spring wheat crop has reached the headed stage, 1 point ahead of the five-year average. Harvest has begun, with 5% of acreage harvested. National condition ratings improved slightly with 55% of crop rated good-to-excellent condition, two points higher than the previous week and seven points above last year. The following states have pockets of spring wheat that are behind the national average of very poor and poor condition: Idaho, North Dakota, South Dakota, and Washington.
  
  Recent weather patterns have provided additional moisture to portions of the northern Plains while warmer temperatures accelerated crop development elsewhere. As harvest expands, continued monitoring of grain quality remains important in areas that experienced repeated rainfall events during heading and grain-fill periods.  Areas of North Dakota, South Dakota, and Montana are most elevated for DON risk.
   
• Barley –98% of the barley crop has reached the headed stage, 2 points ahead of the five-year average. Harvest activity remains limited, with 7% harvested nationally. 46% of barley is rated good-to-excellent, down 6 points from the previous week.  The following states have pockets of barley that are behind the national average of very poor and poor condition: North Dakota, Idaho, and Montana.
  
  Barley production areas across the northern tier continue to experience variable weather conditions, including pockets of above-normal precipitation. As harvest progresses, growers and grain handlers should continue monitoring quality indicators in regions that received prolonged moisture during the flowering and heading stages. States most susceptible to DON risk are areas of Montana, North Dakota, South Dakota and Minnesota. 
   

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