Tar Spot Of Corn: What To Know And New Research
WEBJun 14, 2022 · Tar spot is caused by the fungus known as Phyllachora maydis and can be identified by small, raised black and circular spots present on corn leaves, stalks, and husks (Figure 1). These black and circular spots are known as fungal fruiting structures called stromata, each of which can produce thousands of spores.
Corn tar spot identification and diagnostics guide
WEBMay 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 …
Don't Be Fooled by Tar Spot Look-alikes in Corn - Penn State …
WEBJul 13, 2022 · While tar spot can be easy to recognize, there are a few non-disease lookalikes that can cause false alarms when scouting. These include things like bird droppings, insect frass (see Lead image), aphid honeydew, and debris that may adhere to the surface of corn leaves.
Tar Spot of Corn in the U.S. and Canada | Pioneer® Seeds
WEBDec 4, 2023 · Tar spot (Phyllachora maydis) is a relatively new disease of corn in the U.S., first appearing in Illinois and Indiana in 2015 and subsequently spreading to neighboring states. In 2018, tar spot established itself as an economic concern for corn production in the Midwest, with severe outbreaks affecting corn yield reported in several states.
Don’t miss window to control tar spot - Farm Progress
WEBJul 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.
Identifying Tar Spot in Corn | Crop Science US - Bayer
WEBAug 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.
Tar Spot of Corn: A Diagnostic and Methods Guide
WEBAug 1, 2022 · Tar spot of corn is an emerging plant disease in the continental United States and Canada caused by the fungal pathogen Phyllachora maydis Maubl. Tar spot has been known to occur in Mexico, the Caribbean, and Central and South America since the early to mid-1900s.
An Overview of Tar Spot - Crop Protection Network
WEBMay 1, 2020 · You can diagnose corn tar spot in the field by examining corn leaves for the presence of circular to diamond-shaped, black, tar-like spots, which may have a slightly raised appearance and feel bumpy to the touch. Tar spot stromata cannot be …
How to identify Tar Spot disease and manage its spread - Successful Farming
WEBJul 27, 2022 · Tar Spot is found on healthy and dead plant tissue, and it appears on both the upper and lower surfaces of leaves. Know the difference between Tar Spot and late-season degradation. Tar Spot is sometimes mistaken for saprophytic organisms, which help to break down dead plant tissue in the fall.
Fighting Tar Spot, A New Foe for Farmers - Purdue University …
WEBNovember 16, 2023. The strange black circles began appearing on corn leaves in Indiana’s Cass and Carroll counties in 2015. It looked almost as if someone had dipped a brush in black paint and flicked it on the corn. Farmers had never seen anything quite like it, but it gave them a bad feeling.
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