Source: Iowa State University

Warm weather has accelerated stalk borer migration with 10 percent stalk borer movement expected to start in Iowa this week, according to Iowa State University

Stalk borers have a wide host range, with larvae feeding on more than 175 different plant species. In the spring, young larvae are commonly found on brome grass and giant ragweed. Stalk borer larvae hatch around 500 growing degree days (base 41 F) of accumulated temperatures. Older larvae can quickly outgrow grass and weed stems and begin moving to corn and occasionally soybean around 1,400 growing degree days.

Original press release