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ISDA describes 2024 Snake River response, expanded sampling and a 200‑hour chelated‑copper treatment
Summary
The Idaho State Department of Agriculture briefed the House committee on the 2024 quagga mussel response: expanded inspections and water sampling statewide, a delimiting detection in September, and an intensive October treatment on the mid‑Snake River using chelated copper and multiple agency and private partners.
Chanel Tewalt, director of the Idaho State Department of Agriculture, and Nick Zerflue, the ISDA bureau chief who oversees the invasive species response, updated the House Agriculture Affairs Committee on the agency’s 2024 activities to detect and respond to quagga mussel veligers in the Snake River.
Tewalt outlined the program expansion: ISDA inspected about 50 percent more boats in 2024 than in 2023 and doubled water sampling statewide. She said sampling is now published and available so “it'll tell you who pulled the sample, where they were, when they pulled the sample and what we found in that location.”
ISDA reported a delimiting detection of quagga mussel veligers in the mid‑Snake in late September 2024. After molecular confirmation, agency teams undertook targeted delimit sampling to identify the leading edge of the detection and then planned a treatment. Zerflue said the population…
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