Insect activity update

June 21, 2019 9:25 AM
Blog Post

I was a speaker at the ISU Northern Research Farm field day near Kanawha yesterday. So many questions about thistle caterpillar and soybean gall midge. I also saw some feeding injury to vegetative corn. Here are some pictures:

Stink bug injury in corn.
I saw a few stink bug nymphs. I think this is the result of their feeding last week. Note the yellow halo around the holes. 

Caterpillar injury in corn.
Similar type injury but I think this is from a caterpillar. Often called "shothole" feeding. Note the absence of a yellow halo. 

Common stalk borer exit hole.
Brome grass with an exit hole from common stalk borer. 

Common stalk borer.
Common stalk borer moving to corn. 

Author: 

Erin Hodgson Associate Professor

Dr. Erin Hodgson started working in the Department of Entomology at Iowa State University in 2009. She is an associate professor with extension and research responsibilities in corn and soybeans. She has a general background in integrated pest management (IPM) for field crops. Dr. Hodgson's curre...