May 9, 2012
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.
Smooth bromegrass head killed by a stalk borer.
Stalk borer hole in the stem of smooth bromegrass.
Stalk borer still in the smooth bromegrass stem but about ready to head for corn.
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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