During the winter, Iowa State University Extension staff and the Iowa Department of Agriculture and Land Stewardship (IDALS) Pesticide Bureau staff fielded questions about Section 18 (emergency exemption) fungicides to decide whether Iowans can legally spray them for management of Asian soybean rust (ASR). In 2005, the Iowa Soybean Rust Team formulated the "I-70 Rule." They recommended that Section 18 fungicides not be sprayed unless Asian soybean rust was found north of I-70 in Missouri.
Iowa State University
Mueller, Daren S., "Questions concerning Section 18 fungicides" (2006). Integrated Crop Management News. 1225.
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