Tar Spot Showing Early this Year: a Note on Diagnosis

Jul 13, 2021

By Pierce Paul

I have so far only received one confirmed report of Tar Spot in the state, but the fact that the disease has been reported in a few neighboring states has some stakeholders asking questions about diagnosis and management. Tar Spot is a relatively easy disease to diagnose. As the name suggests, it usually shows up as raised, black spots, primarily on the leaf blast. The size of the spots may vary, but they all have a very similar appearance – raised, circular-to-irregularly shaped, black spots. However, is you do have trouble with diagnosis, please feel free to send me images and samples (1680 Madison Ave, Wooster, OH 44691).

This is the earliest we have seen Tar Spot in the state since it was first reported in 2018. Results from studies out west suggest that yield losses due to Tar Spot tends to be highest when it develops and spreads before tasseling (VT) on susceptible hybrids. Warm, wet, and humid conditions seem to favor the development and spread of Tar Spot, so keep your eyes on the weather, and watch the progress of the disease. If it continues to spread, a fungicide application may be warranted, but efficacy of fungicides against Tar Spot is still being investigated.

Source : osu.edu

Video: Spraying Corn Herbicide

Border View Farms is a mid-sized family farm that sits on the Ohio-Michigan border. My name is Nathan. I make and edit all of the videos posted here. I farm with my dad, Mark and uncle, Phil. We also have a part-time employee, Brock. My dad started the farm in 1980. Since then we have grown the operation from just a couple hundred acres to over 3,000. Watch my 500th video for a history of our farm I filmed with my dad.

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