In 2007, many acres of corn in Wisconsin were sprayed mid-season with fungicides, strobilurin or a strobilurin/triazole combination, (in Iowa and Illinois an estimated six million acres of corn were sprayed).

Most acres applied had little or no disease at the time of application. Reasons for spraying vary and include the high price of corn, potential to control diseases, and a possibility of improved yield from “plant health” benefits. Until this year, fungicide applications to production cornfields were rarely practiced because they were not profitable. Many of the hybrids grown today have good overall tolerance to foliar diseases…

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