Wheat Disease Update: Fusarium Head Blight Risk Is Open Across Maryland
Certified Crop Advisor Ben Hushon with The Mill joined Market Day Report this week with a timely and important message for wheat growers across Maryland and southern Pennsylvania. The topic the host had written down specifically to ask about was Fusarium head blight, and Ben's answer is one that every grower with wheat in the ground right now needs to hear.
What Is Fusarium Head Blight and Why Does It Matter Now
Fusarium head blight, also known as scab, is a fungal disease that infects wheat during the flowering stage. When conditions favor the disease during that narrow window, the pathogen can penetrate the developing head and cause significant yield loss, quality degradation, and the accumulation of deoxynivalenol, a mycotoxin commonly called DON or vomitoxin, that can make grain unmarketable or unsaleable to certain end users.
The disease has been a recognized concern in Maryland and surrounding states for roughly 15 years, when it first began appearing regularly in this geography. Since then, university researchers have developed predictive models that estimate Fusarium head blight risk based on temperature, moisture, and crop stage data.
Ben reported that the region is currently sitting in the middle of that risk model, describing it the way a forecaster might describe partly cloudy skies with a recommendation to bring an umbrella. The conditions are not certain to produce a problem, but the risk level is meaningful enough to take seriously.
Why Dry Conditions Do Not Eliminate Fusarium Risk
One of the most important clarifications Ben offered this week is that the dry spring growers have experienced does not mean disease risk is low. Wheat growers who have been watching dry conditions since early March may have assumed that a lack of rainfall would keep disease pressure manageable. Ben pushed back on that assumption directly.
The disease triangle for Fusarium head blight requires three elements: a susceptible host, the presence of the pathogen, and favorable environmental conditions. The environmental piece does not require rainfall alone. Morning dew, overnight humidity, and wet foliage from condensation are all sufficient to create the leaf wetness that drives infection risk.
Ben described waking up, walking across the yard, and having wet shoes as a straightforward illustration of the moisture conditions that contribute to disease risk even in the absence of measurable rainfall. When the wheat canopy is dense and the mornings are dewy, the microenvironment within that canopy can be considerably wetter than the surrounding conditions suggest.
Powdery Mildew Is Already Visible in Wheat Fields
While Fusarium head blight symptoms will not be visible until after infection has already occurred, another disease is already showing up in wheat fields across the region right now. Ben noted that powdery mildew is present and visible in healthy wheat stands throughout the area, and that even someone unfamiliar with the disease would notice it immediately by parting the canopy and looking at the lower leaves.
Powdery mildew appears as a white to gray powdery coating on leaf surfaces. It thrives in dense canopies with poor air circulation and moderate temperatures, exactly the conditions that many well-managed wheat fields across Maryland are presenting right now.
The presence of powdery mildew is itself a signal about the microclimate conditions within these wheat fields. If moisture is sufficient to drive powdery mildew development in the lower canopy despite a dry spring, the same conditions are contributing to Fusarium risk at the head as the crop moves through flowering.
The Fungicide Decision Window Is Now
Fusarium head blight is a preventable disease in the sense that a well-timed fungicide application at flowering can significantly reduce infection levels. The critical phrase is well-timed. Once flowering is complete and the risk window has passed, a fungicide application loses most of its effectiveness against Fusarium head blight. The spray needs to be on the heads at the time of infection risk, not applied reactively after symptoms appear.
Ben was clear that the decision is one each grower needs to make based on their assessment of risk for their specific farm and fields. University risk models provide a framework, and those tools are publicly available and updated regularly during the flowering period. For growers uncertain about their risk level or spray timing, consulting with an agronomist before the window closes is the most reliable path to a sound decision.
Soybeans and Corn Are Finally Moving
Beyond wheat disease management, the broader field picture showed meaningful progress this week. Soybeans, which have been struggling to emerge through cool temperatures, dry soils, and a frost event, are finally out of the ground across the community. Corn is also starting to emerge, with another quarter to half inch of rain received in the region since Ben's previous appearance.
The concern now is heat. Temperatures are forecast to reach 90 degrees and above through Monday, Tuesday, and Wednesday of this week. That kind of heat accelerates growth, which is what young corn and soybean plants need, but it also creates stress without adequate soil moisture to support it. Ben expressed hope that the forecast would deliver rain later in the week to keep young plants from experiencing heat and moisture stress simultaneously during their earliest growth stages.
Commodity Markets Continue to Strengthen
The market backdrop remains favorable for Mid-Atlantic growers as the season moves into its most critical phase. Soft red wheat climbed to $6.50 per bushel on the July contract, up nearly 24 cents, while hard red wheat advanced to $7.02. Soybeans pushed back above the $12 per bushel mark on the November contract, up 30 cents following two consecutive lower sessions. Corn held near $4.94 on the December contract, up 13.5 cents.
For wheat growers in particular, the combination of strong prices and active disease risk reinforces why fungicide timing decisions this week carry real economic weight. Protecting yield and grain quality through the flowering stage is the most direct way to capture the value that current wheat prices represent.
Connect With The Mill's Agronomy Team
The Mill's agronomy team is actively scouting wheat fields, evaluating Fusarium head blight risk, and supporting fungicide timing decisions across Maryland and southern Pennsylvania. With the disease window open and flowering either underway or imminent across much of the region, the time to make this call is now.
Connect with The Mill's Agronomy Team to evaluate your Fusarium risk and make the right fungicide decision before the window closes.
