Tar spot of corn

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"Tar spot is a corn disease that was first confirmed in the United States in 2015 and detected in Missouri in 2019. The disease is caused by a fungus, Phyllachora maydis, which can survive Missouri winters, allowing it to persist from season to season. The impact of tar spot varies each year and is dependent on weather conditions, hybrid susceptibility, and timing of disease onset. Tar spot can be observed without subsequent yield losses. However, severe outbreaks can occur when conditions favor disease spread and result in significant yield losses of 20 to 60 bushel/acre in the north central United States" -- first page

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Archive version. For the most recent information see extension.missouri.edu.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station websites for current information.