CORRECTION to Alfalfa Weevil Scouting Update 2010

May 4, 2010
ICM News

By Adam Sisson, Corn and Soybean Initiative and Erin Hodgson, Department of Entomology

The alfalfa weevil article published on May 3, 2010 in the ISU Extension Integrated Crop Management News included predicted dates for scouting for the alfalfa weevil larvae in Iowa. The article used degree days that were obtained from the web-based climate service Midwestern Regional Climate Center

Following publication of the article, Iowa State University Extension field agronomist Brian Lang noticed that the degree days reported in the article were lower than what he was observing in northeastern Iowa and that degree days reported by ISU Extension field agronomist Virgil Schmitt for the east-central and southeast parts of the state were higher than reported in the article.

The information from Iowa State Extension field agronomists and new data from a cumulative growing degree day map from Oregon State University suggest that all of the crop reporting districts in Iowa have surpassed the scouting threshold for alfalfa weevil and that growers should presently be looking for the insect in fields. 

We apologize for any confusion.


Adam Sisson is a program assistant with responsibilities with the Corn and Soybean Initiative. Sisson can be contacted by email at or by calling (515) 294-5899.  Erin Hodgson is an assistant professor of entomology with extension and research responsibilities. She can be contacted by email at or phone (515) 294-2847.

Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on May 4, 2010. The information contained within may not be the most current and accurate depending on when it is accessed.


Adam Sisson Extension Program Specialist III

Adam Sisson is an extension specialist with the Iowa State University Integrated Pest Management (IPM) program. Sisson focuses on the development of publications and other educational resources for farmers, agribusiness, and students. He receive...

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...