Jun 14, 2022 · What is Tar Spot? Due to its relatively recent U.S. discovery and its ability to cause significant production and economic losses, tar spot is often a topic of angst and anxiety amongst corn farmers and agronomists in Indiana.

May 10, 2023 · Tar spot symptoms appear initially as flecking and mild chlorosis (yellowing) on leaves, stalks and husks. The black tar spots form after the flecking or yellowing. These spots are the fungal structures called stromata, which are embedded in the plant tissue.

1 day ago · Tar spot occurs earlier in the season and can progress quickly from a few lesions on leaves to a severe infection across the entire crop. It can lead to poor grain fill, kernel abortion and reduced kernel weight. Scouting corn and soybeans for fungal diseases like tar spot should be done early and often.

Dec 1, 2024 · Tar spot disease in corn crops is spreading across the US with confirmed cases in the North, East, South, and Central regions. Experts provide insight. Tar Spot, caused by a fungus called Phyllachora maydis and native to Central America, …

May 1, 2020 · Tar spot is a foliar disease of corn that commonly occurs throughout the Caribbean, Central America, Mexico, and South America. Tar spot was identified in the United States for the first time in 2015, in northern Illinois and Indiana.

Jul 5, 2024 · Tar spot is the one disease in susceptible areas best treated as a preventative on acres vulnerable to infection. If you identify tar spot between V12 and R1 and find consistent lesions on multiple plants, plan for a fungicide application.

Jan 20, 2025 · Tar spot, caused by the fungus Phyllachora maydis, is an increasingly prevalent disease affecting corn crops. Characterized by raised black lesions on corn leaves, this disease can significantly reduce photosynthesis, leading to lower yields and poor-quality grain.

Jul 27, 2022 · Learn how to identify Tar Spot with the following strategies. Look at placement and movement. The disease begins on the lower corn leaves and moves to the upper plant and ear husks. Rule out other diseases. It’s easy to confuse Tar Spot with Common Rust or Southern Rust late in the season.

Aug 9, 2023 · Tar spot is a foliar disease of corn caused by the fungus Phyllachora maydis. It was first confirmed in the United States in 2015 in Illinois and Indiana. Tar spot has expanded its range as far west as Nebraska, Kansas, and South Dakota to as far east as Pennsylvania, Georgia, and Florida as of 2023.

Mar 19, 2019 · Tar spot is caused by the fungus Phyllachora maydis, and can cause severe yield loss on susceptible hybrids when conditions are favorable for disease. Tar spot appears as small, raised, black spots scattered across the upper and lower leaf surfaces.