Tar spot has moved west quickly as it has infected fields across Missouri, Iowa, and has now been confirmed in some counties in Nebraska. If you’ve had tar spot in your field, you know the damage it can cause. If you’ve been lucky and not gotten it so far, you could still get it.
The growing season of 2021 has provided many areas in the Midwest with favorable conditions for possible southern corn rust development. Currently in the Midwest, southern rust has been observed in southeast Kansas, Missouri, and southern Illinois. Current numbers are low, but if high humidity and temperatures continue the pathogen could spread quickly.
Southern corn rust, a fungus caused by Puccinia polysora, thrives in temperatures above 80 F with high humidity, particularly if corn has been planted late.
Gray leaf spot leads to leaf tissue loss, a decrease in plant sugars and decreased grain production. It is considered the world’s most yield-limiting disease in corn…
As harvest begins, it is important to continue scouting fields for diseases, including ear rots