College of Agricultural, Consumer & Environmental Sciences Illinois Extension

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A fungal leaf disease on maple leaves in the form of dark spots caused by the pathogen Rhytisma acerinum, tar spot

Sick plants? Rotate fungicides to prevent resistance

August 8, 2025

We have hit the other side of the precipitation pendulum. In 2023 and 2024, we experienced drought conditions. Now in 2025, the sump pump sales have surely hit a high note. For instance, Macomb's total July 2024 rainfall averaged around two inches. In 2025, many Macomb rain gauges recorded over ten...

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College of Agricultural, Consumer & Environmental Sciences Illinois Extension

101 Mumford Hall (MC-710)

1301 W. Gregory Dr.

Urbana, IL 61801

Email: extension@illinois.edu

EEO myExtension Staff Login

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Fungicide Blogs

Sick plants? Rotate fungicides to prevent resistance