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Swarm of mosquitoes.

West Nile Virus Update: September 3, 2025

As of August, the South Dakota Department of Health indicated that West Nile Virus positive mosquito pools have been detected in Beadle, Brookings, Brown, Codington, Hughes, Lincoln, and Minnehaha counties.

Color-coded map of South Dakota indicating the number of classes of change in drought conditions from June 3 to September 2, 2025. For a detailed description, please call SDSU Extension at 605-688-4792.

Summer 2025 Climate Review and September Outlook

A record wet August in several locations marked the end of South Dakota’s meteorological summer. One challenge coming this fall will be determining how quickly field and crop conditions dry down to allow harvest activities to progress.

A group of brown cattle foraging in a green field.

Prussic Acid Poisoning

As the first frost date approaches, producers often have concerns about the risk of prussic acid poisoning in livestock. Certain forage plants, especially sorghums and related species are associated with an increased risk of death loss because of prussic acid poisoning.