Integrated Crop Management News

Links to these articles are strongly encouraged. Articles 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 articles are used in any other manner, permission from the author is required.

Flooded Corn and Saturated Soils

May 30, 2008
Image of ponding in a field with two-leaf corn seedlings

By Roger Elmore and Lori Abendroth, Department of Agronomy

The storms last Sunday, May 25, and again on the May 29 and 30 have unloaded extraordinary amounts of rain in many parts of Iowa. Soils in the majority of the state are likely saturated. Low lying areas of fields whether they are tiled or not, are covered with ponds and areas along streams and rivers are flooded. It is not an attractive sight for producers!

Now Grow! (No, Not You, Weeds)

May 27, 2008
Image of base 50 degree F degree days in regions of Iowa from May 1 to May 26, 2008

The week of May 19 through May 26 was slightly cooler than average.  Favorable field conditions allowed corn and soybean planting to catch up.  About 60 to 70 percent of soybeans are planted statewide. 

Where Do I Get Weather Information?

May 23, 2008
Screenshot of the weather.gov page

By Elwynn Taylor, Department of Agronomy

There are several sources of weather information available to help farmers make informed crop production decisions.

To see the forecast for your ZIP code go to www.weather.gov. Click the general location of interest within the U.S. map. Now click your “exact” location (if you miss it a bit you get a chance to put in your ZIP code.)

La Nina Diminishes

May 23, 2008

By Elwynn Taylor, Department of Agronomy

The La Nina of the past several months as determined by the 90-day average Southern Oscillation Index (SOI) has ended. The SOI is a measure of the atmospheric pressure deviation from normal and directly influences meteorological conditions in numerous distant locations. The SOI diminished to 0.8 standard deviations on May 19, 2008. 

Timeliness Critical to Protect Corn Yields

May 23, 2008
Image of a weedy cornfield

By Bob Hartzler, Department of Agronomy

Weeds likely are emerging with corn in many fields due to the lack of a preemergence herbicide. Whether this was planned or due to weather constraints, it is critical to control weeds early in order to protect yields.

Update on Fungicides for Use on Soybean

May 20, 2008

By Daren Mueller, Department of Plant Pathology

There have been some changes in the availability of fungicides for soybean. Here is a quick summary.

Alto® (cyproconazole, Syngenta Crop Protection) has been fully registered for use on soybean by EPA. The product will be available for use on soybean in Iowa when the new label is approved by the state. Until then, this product will only be available through its Section 18 label for soybean rust.

Finally! A Good Work Week

May 20, 2008
Image of base 50 degree F degree days in regions of Iowa from May 1 to May 18, 2008

The last week found Iowa farmers able to get to the field, and crop planting progress advanced notably. Although the week followed the seasonal temperature trend, being a bit cooler than average, the rain held off for the most part.

 

Emerged corn can now be found across Iowa, and soybean planting is well underway.

 

Black Cutworm Scouting Advisory—2008

May 16, 2008
Map of the projected dates of first cutting: black cutworm

By Marlin E. Rice, Rich Pope, and Jon Tollefson, Department of Entomology

A significant flight of black cutworm adults (moths) arrived in Iowa the weekend of April 18, based on pheromone trap capture data across the state.

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