Northeast Iowa Corn Rootworm Demonstration

An increase in corn rootworm populations has farmers looking for answers. To provide research-based education about their options, Iowa State University Extension and Outreach are teaming up with field agronomists to offer seven field days across the state, beginning June 29.

Last year, entomologists and field specialists with Iowa State University Extension and Outreach received numerous questions about the effective management of corn rootworm as populations have increased in the past two years and farmers have experienced enhanced root injury during drought conditions

Each farm has planted a demonstration showcasing three hybrids (no Bt for corn rootworm, SmartStax, and SmartStax Pro) with and without a soil-applied insecticide.

In addition to ways to prevent corn rootworm, the event will feature scouting tips and advice. Erin Hodgson, professor in entomology and extension specialist in entomology at Iowa State, recommends corn growers dig a few corn roots up in July and August, even if they don’t suspect they have a problem with corn rootworm.

“In most growing conditions in Iowa, you’re not going to see above-ground signs of stress, because we have such good soils,” said Hodgson. “But that doesn’t mean corn rootworm isn’t present or that it won’t be a problem later in the season.”

Hodgson said she’s looking forward to showcasing a diverse approach to corn rootworm management, including crop rotation, transgenics, and the SmartStax products. The best way to control rootworms is through prevention. There will also be a novel management tactic, RNAi, planted at each location.

The demos are open to farmers, crop consultants, agronomists, and anyone with an interest in rootworms.

The field days are free to attend, but participants are asked to contact the field agronomist hosting each event to RSVP for food and handouts.

Contact: Josh Michel at jjmichel@iastate.edu or Terry Basol at tlbasol@iastate.edu