Making Fungicide Decisions for Corn and Soybean in 2026

Jun 23, 2026

By Tamra Jackson-Ziems and Dylan Mangel et.al

Key Takeaways for Corn Disease

Tar spot confirmed this week.
Treatment is not recommended at this time.
Monitor tar spot progression regularly as crop matures.
Reevaluate the need for treatment during early to mid-reproductive stages.
Southern rust not currently reported in the U.S.

Crop diseases have been especially important in parts of Nebraska during the last two years. Before you make a fungicide decision on corn or soybean, there are several factors to consider.

Corn Disease

Tar Spot

Tar spot (Figure 1) was confirmed in several counties in Nebraska this week. This disease is caused by a fungus (Phyllachora maydis) that overwinters very effectively in Nebraska. The likelihood of your corn developing tar spot is greater if there was substantial tar spot disease in the past (because of the presence of more overwintering fungus to cause disease again).

The tar spot fungus is also favored by wet conditions but prefers cooler temperatures averaging 60–70°F. That’s why we often observe tar spot development early in the season (now), as well as a surge of disease often again late season when conditions are more favorable.

Overhead irrigation, such as through center pivots, can also increase the chances of tar spot development as it reduces the temperature by several degrees and increases relative humidity and leaf wetness for several hours. Pivot-irrigated fields should be scouted regularly, as they are at a higher risk for the disease, as well as areas where frequent rainfall occurs with a history of substantial tar spot pressure..

Source : unl.edu

Video: Independent Seed, National Impact | On The Brink: Episode 9

A survey of 200 independent seed businesses reveals what Canada's seed sector actually contributes — and what it stands to lose.

On the Brink, Justin Funk, a third-generation agri-marketer, shares the findings of a national survey conducted in early 2026. The numbers reframe the conversation: independent seed companies in Canada represent upwards of $1.7 billion in dedicated seed infrastructure, approximately 3,000 full-time equivalent jobs in rural communities, and an estimated $20 million in annual community contributions. And roughly 90% of Canada's cereals, pulses, and other small pollinated crops flow through them.

The survey also asked how dependent these businesses are on public plant breeding to survive. The answer was unambiguous. For policymakers evaluating the future of publicly funded breeding programs, Funk argues the economic case for this sector and the case for public plant breeding are the same argument.

On the Brink is a cross-country video series exploring the future of plant breeding in Canada. Each episode features voices from across the industry in an open, ongoing conversation about innovation and long-term investment in Canadian agriculture.