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Are corn rootworms here, or was it a false alarm?Are corn rootworms here, or was it a false alarm?

Sight of a lightning bug in late May raises questions about corn rootworm hatch

Tom Bechman 1

June 3, 2015

2 Min Read

Tom Turpin got people's attention many years ago, long before you could control rootworms with GMO traits, when he proclaimed that corn rootworm hatch roughly correlates to appearance of lightning bugs in late spring or early summer.

Related: Using a soil insecticide alongside corn rootworm traits is not advised

Turpin is a Purdue University entomologist, famous for cockroach races at the Indiana State Fair, eating mealworms and being a past Honorary Master Farmer.


Some may have thought it was one of his famous pranks. However, John Obermeyer, another Purdue entomologist, says there is actually a good correlation between when lightning bugs appear and when you can start finding rootworm larvae in corn fields. The correlation likely hinges on the fact that both respond to heat units accumulated over time to reach a certain stage in development where they make an appearance.

So I was quite surprised last week, on May 24 to be exact, when sitting on the back porch with my wife, Carla, and daughter, Kayla, Kayla insisted she saw a lightning bug. I was looking the other way, naturally, and didn't see it, if there was one.

Her eyes are better than mine anyway, so I assume there was one.

It's been a relatively cool spring. Surely lightning bugs weren't out yet. That would mean, if Turpin is right, that corn rootworm larvae could be hatching too.

Obermeyer offers a possible explanation where everyone could be right. "There are two kinds of lightning bugs," he says. "One is more commonly found in wooded or wet areas. If you put the adults side by side, the one found in those places is smaller than the one found in fields."

The caveat is that the one found in woods and wet areas comes out much earlier, Obermeyer notes. Our house and barn lot are full of trees. So is it possible Kayla saw one of the "other" kind of lightning bugs? Possibly. Obermeyer says that from a distance, they would appear very similar.

Related: Why Western corn rootworm is so tough to control

At any rate, both "real" lightning bugs and corn rootworm larvae will be appearing soon. They are likely to appear first in southern and central counties in Indiana. Keep an eye out for both.

About the Author(s)

Tom Bechman 1

Editor, Indiana Prairie Farm

Tom Bechman is an important cog in the Farm Progress machinery. In addition to serving as editor of Indiana Prairie Farmer, Tom is nationally known for his coverage of Midwest agronomy, conservation, no-till farming, farm management, farm safety, high-tech farming and personal property tax relief. His byline appears monthly in many of the 18 state and regional farm magazines published by Farm Progress.

"I consider it my responsibility and opportunity as a farm magazine editor to supply useful information that will help today's farm families survive and thrive," the veteran editor says.

Tom graduated from Whiteland (Ind.) High School, earned his B.S. in animal science and agricultural education from Purdue University in 1975 and an M.S. in dairy nutrition two years later. He first joined the magazine as a field editor in 1981 after four years as a vocational agriculture teacher.

Tom enjoys interacting with farm families, university specialists and industry leaders, gathering and sifting through loads of information available in agriculture today. "Whenever I find a new idea or a new thought that could either improve someone's life or their income, I consider it a personal challenge to discover how to present it in the most useful form, " he says.

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