By Rich Pope, Department of Plant Pathology
A third straight week of cooler than average weather has slowed crop progress across Iowa. Sporadic rainfall has limited field work, and for many fields weeds are a growing concern (pun intended). There has been slow weed response to herbicides, especially with glyphosate. The answer to this lies in getting some warmer weather to stimulate growth. So patience is a virtue.
During the week of June 7-14 Iowa crops accumulated about 40 to 60 degree days fewer than the long term averages (30-year running average). That is equivalent to the crop putting in a four to five day week!
The degree day accumulations posted here are for the growing season that arbitrarily starts on May 1 each year, but many fields are planted in April. From April 15 through May1, base-50 degree day accumulations ranged from 107 in northwest Iowa, to 121 in central Iowa to 148 in the southeast. All these values were close to average.
Rich Pope is a program specialist with responsibilities with Integrated Pest Management. Pope can be contacted by email at email@example.com or by calling (515)294-5899.
This article was published originally on 6/16/2009 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.