By Mark S. Johnson, Kelvin Leibold and Paul Kassel, ISU Extension and Outreach
Integrated Crop Management News
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By Angela Rieck-Hinz, Department of Agronomy, and Kapil Arora, Iowa State University Extension and Outreach
Iowa State University Extension and Outreach and the Iowa USDA-Natural Resource Conservation Service (NRCS) have scheduled an Advanced RUSLE2 workshop for Sept. 26, 2013, at the Polk County Extension Office in Altoona. This workshop starts at 8 a.m.
By Daren Mueller, Department of Plant Pathology and Microbiology
After taking much of the growing season off, soybean diseases are finally starting to wake up and make a bit of noise.
Yes, you read correctly, a soybean rust update. It has been a few years. Dr. Carl Bradley has a nice article on the status and risk of soybean rust in Illinois. The article includes the most common look-alike diseases.
By Bob Hartzler, Department of Agronomy, and Rich Pope, Harrison County Extension
The presence of Palmer amaranth was recently confirmed in Harrison County near the Missouri River. The infestation was in two fields that have a history of land application of sludge. Because of the magnitude of the infestation, we believe the weed has been present for at least two growing seasons. We suspect the weed probably has spread to other fields in the area, but at this time we have not verified this.
By Mark Licht, ISU Extension and Outreach
A field day will be held on Aug. 30, hosted by the Iowa State University (ISU) Agricultural Engineering/Agronomy Research Farm, rural Boone, from 9 a.m. to noon with lunch and tours of the ISU Biocentury Farm following the program.
The event will focus on cover crops and corn production. The field day is free and the public is invited to attend.
This is the only species in Iowa that will colonize soybean. Scout weekly from plant emergence until seed set. Aphids prefer to feed on the undersides of leaves and will establish on the newest leaves. If a large colony develops, they will feed on stems. Initial infestations are patchy and located near field edges, but winged aphids can quickly disperse within and between fields. Commercial fields that have reached uniform infestation should be closely monitored in August.
By Roger Elmore, Department of Agronomy
Cool August temperatures across Iowa slow growing degree day (GDD) accumulations. In addition, Iowa’s late corn planting dates this year obviously impacted the crop as well. These two factors affect corn yield potential.
By Alison Robertson and Daren Mueller, Department of Plant Pathology and Microbiology, and Stuart McCulloh, Field Extension Education Laboratory