Skip Navigation

Degree days - Crops in Good Condition Despite Cool Temperatures

by Rich Pope, Corn and Soybean Initiative

The 2009 growing season finished off May a bit cool, with degree day accumulations for only one of the nine crop reporting districts, west central, besting its long-term average. May was marginally cooler in the east, although that is not a problem, and crops are off to a great start statewide. 

Degree day map for May 31

As we projected, black cutworm larvae were large enough to damage corn in southern Iowa by May 25 - with light black cutworm feeding on corn noted last week in southeast and south central Iowa.  These infestations have been light and sporadic, but they warrant monitoring.

Weedy fields are a concern statewide. Timely and appropriate weed management, especially in no-till fields, can be economically significant.


Rich Pope is a program specialist with responsibilities with Integrated Pest Management. Pope can be contacted by email at or by calling (515)294-5899.


This article was published originally on 6/3/2009 The information contained within the article may or may not be up to date depending on when you are accessing the information.

Links to this material are strongly encouraged. This article may be republished without further permission if it is published as written and includes credit to the author, Integrated Crop Management News and Iowa State University Extension. Prior permission from the author is required if this article is republished in any other manner.