That includes the fungus tar spot. Showing up as black speckled dots ... Bauer says while many think rainfall and temperatures are a key driver, there’s another indicator to watch.

An agronomist with AgriGold says many farmers have tar spot on their mind. Brian Weihmeir, who covers central Illinois, says ...

Tar spot robbed several key corn-producing states ... data with its research models and GPS weather information, including temperature, dewpoint, humidity and precipitation to recommend the ...