By Scout Nelson
Recent hailstorms in Minnesota have caused damage to corn crops, leading to questions about whether applying fungicides may help improve plant health or yield. However, research suggests that fungicides do not provide consistent benefits in these situations.
Some believe that hail-damaged corn is more vulnerable to disease and that fungicides can reduce infections. While hail can open pathways for certain diseases like common smut, Goss’s leaf blight and wilt, and possibly stalk roots, studies show that these diseases are not effectively managed by foliar fungicide treatments.
In fact, a study conducted in Iowa found that disease levels were actually lower in corn plots that had simulated hail damage, challenging the idea that damage increases disease risk.
Additional field studies have been conducted to evaluate the impact of fungicide use on hail-damaged corn. In Illinois, a two-year study using simulated hail damage revealed no significant reduction in disease or increase in yield when fungicides were applied. Similarly, a three-year study in Iowa at three different locations also showed no improvement in disease control or yield across various levels of simulated hail injury.
Reports from crop advisors in Minnesota reflect the same findings—fungicide applications after hail damage did not result in reduced disease or improved yield. In general, fungicides have not consistently increased yield in corn fields unless a controllable leaf disease is present.
“In summary, available information suggests that foliar fungicides do not consistently reduce disease or increase yield in hail-damaged corn.”
Despite this, some may still choose to apply fungicides. Ongoing field evaluations are encouraged, and data from those who do apply fungicides can help expand understanding of their value under these conditions.
Photo Credit:gettyimages-olga-ivanova
Categories: Minnesota, Crops, Corn, Weather