Nebraska Corn: Tar Spot Disease Spreading to More Counties Oct 17, 2022

    🕔Oct 17, 2022
    Tar spot, caused by the fungus Phyllachora maydis, was confirmed in eight eastern Nebraska counties in October 2021. As expected, the fungus overwintered and disease redeveloped in 2022 as field conditions […]

    Minnesota Corn: Scout Field for Tar Spot Oct 4, 2022

    🕔Oct 4, 2022
    Tar spot of corn has continued to develop in many fields across southeastern and into central Minnesota. Fortunately, with the exception of some areas in southeastern MN, tar spot has […]

    Missouri Corn: Tar Spot Confirmed in Carroll, Harrison, and Marion Counties Sep 21, 2022

    🕔Sep 21, 2022
    Tar spot was first confirmed in Missouri in Marion County in 2019. The pathogen that causes tar spot, Phyllachora maydis, can survive over the winter in corn residue, so disease […]

    Kentucky Corn: Tar Spot Confirmed in Lincoln County Sep 21, 2022

    🕔Sep 21, 2022
    Tar spot on corn was confirmed by the University of Kentucky Plant Disease Diagnostic Laboratory (PDDL) from samples collected in Lincoln County. This is our first confirmation of tar spot […]

    Iowa Corn: Should You Apply a Late Season Fungicide for Tar Spot? Aug 27, 2022

    🕔Aug 27, 2022
    I continue to receive tar spot reports from across Iowa. Given the moisture we have had the past couple of weeks and the growth stage of the crop, this is not […]

    Ohio Corn: More on Tar Spot – Mid to Late R-Stage Fungicide Application Aug 16, 2022

    🕔Aug 16, 2022
    Most of the corn across the state of Ohio is now between the late-R1 (silking) and late-R3 (milk) growth stages, with a few late-planted fields at late vegetative stages. Concerns […]

    Indiana Corn: Tar Spot Confirmed for 1st Time in 2022 Aug 12, 2022

    🕔Aug 12, 2022
    Tar spot continues to be found in Indiana and our first confirmation of southern corn rust happened this week (Figures 1 and 2). I suggest if you have not gotten […]

    Michigan Corn: Mid-Season Tar Spot Management Considerations Aug 11, 2022

    🕔Aug 11, 2022
    What is tar spot? Tar spot is a disease of corn that was first found in Michigan in 2016. Tar spot is caused by Phyllachora maydis, a fungus that infects the […]

    Pennsylvania Corn: 1st Incident of Tar Spot Confirmed for 2022 Jul 31, 2022

    🕔Jul 31, 2022
    After a few weeks of diligent scouting on the part of private and Extension agronomists, the first positively identified tar spot lesions of 2022 were discovered today in Lancaster County, […]

    Indiana Corn: What Diseases To Look for in Corn Jul 25, 2022

    🕔Jul 25, 2022
    Corn growth stages are quite variable across Indiana but a number of areas have moved into tasseling or beyond. Therefore, it is time to continue monitoring for diseases to make […]


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