Iowa State University Extension and Outreach

East-Central and Southeast Iowa Crop Information

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May 9, 2012

 

CORN

 

Spraying Fields with Emerged Corn

 

Many corn fields were planted April 25 - 27, 2012 did not receive intended soil applied herbicides before the corn began to emerge.  In some cases, it was also the intention to apply 100+ units of liquid nitrogen fertilizer with the herbicide. And now emerged weeds are (still?) there too.   So now what?  Bob Hartzler and John Sawyer address these issues in the article at http://www.extension.iastate.edu/CropNews/2012/0508hartzler.htm.

 

 

Stalk Borers on the Move

 

According to Growing Degree Day accumulations, base 41, stalk borers are starting to move from grassy areas into nearby corn fields along and south of Highway 34 (Burlington – Mount Pleasant – Fairfield area) and will soon start to move from grass into nearby corn fields north of Highway 34.

 

Information on scouting and management can be found at the ICM News article at http://www.extension.iastate.edu/CropNews/2012/0508hodgsonsisson.htm.

 

Local Growing Degree Day accumulations are shown at http://www.extension.iastate.edu/Pages/eccrops/stalkborer.html.

 

You can get an early “heads up” of the size of potential movement of stalk borers into corn by examining the grass for dead heads; the vast majority of dead heads will have been killed by stalk borers who are outgrowing the grass plant and moving into nearby corn.  The more dead heads you find, the more stalk borers may be poised to move into corn.  Tom Hillyer provided the following pictures.

 

 

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Smooth bromegrass head killed by a stalk borer.

 

 

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Stalk borer hole in the stem of smooth bromegrass.

 

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Stalk borer still in the smooth bromegrass stem but about ready to head for corn.

 

 

 

 

HAY

 

Alfalfa Weevil Winding Down Soon

 

Alfalfa weevils have been a very spotty pest of alfalfa this year and they will soon start to “wind down” in southern Iowa.  Continue to scout alfalfa for this pest and also monitor re-growth.  Details can be found at http://www.extension.iastate.edu/Pages/eccrops/alfalfaweevil.html.

 

 

FOR YOUR CALENDAR

 

 

SOUTHEAST IOWA RESEARCH and DEMONSTRATION FARM, Crawfordsville

SPRING FIELD DAY and 25th Anniversary Celebration (afternoon) &

SPECIAL SESSION FOR CCAs (morning)

JUNE 21, 2012

Details are posted at http://www.extension.iastate.edu/Pages/eccrops/meetserc.html.

 

 

 

 

NORTHEAST IOWA RESEARCH and DEMONSTRATION FARM, Nashua

SPRING FIELD DAY

JUNE 28, 2012, 1 – 4:30 p.m.

Details are posted at http://www.extension.iastate.edu/Pages/eccrops/meetnerf.html.

 

 

 

 

 

TECHNIQUES TO AVOID SPRAY DRIFT

July 17, 2012, Field Extension Education Laboratory (FEEL) near Boone, IA

 

Two half-day sessions (morning session repeated in the afternoon) (no cost to participants) will be conducted, focusing on:

-     Nozzle selection/use with demonstration on spray table

-         Balancing efficacy and drift

-         Environmental factors, adjuvants and limitations, field demonstration, etc.

More information and registration will soon be available at http://www.aep.iastate.edu/.

 

If you have any questions, please feel free to contact the Iowa State University Extension Office.
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Last Update: May 9, 2012
Contact: Virgil Schmitt vschmitt@iastate.edu


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