Corn Seedling Damage from Ammonia
There are several indicators of corn seedling damage from ammonia; an injury that is being reported this spring.
Integrated Crop Management News
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Degree Days - Cool is cool
By Rich Pope, Corn and Soybean Initiative
The month of June opened with a cool week, with about 80 percent of the normal heat accumulated between May 31 and June 7. Although a bit warmer weather would accelerate crop development, Iowa crops are progressing nicely in most areas.
Size Restrictions for Postemergence Herbicides in Corn
By Bob Hartzler, Department of Agronomy
While most farmers and applicators have good intentions to apply herbicides in a timely fashion, it isn’t uncommon for equipment limitations or weather to result in delayed applications. Nearly all postemergence herbicides have restrictions on how late in the season they can be delayed.
Early Signs of Corn Stress
By Roger Elmore and Lori Abendroth, Department of Agronomy
Iowa weather conditions this spring resulted in wide ranges in corn plant color - from green to yellow-green to purple and some with stripes. The color variability in most of our fields is not a cause for alarm as the plants simply reflect the 2009 environment to date. Above- and below-ground growth is slowed with low temperatures, despite the plentiful moisture and sunshine we have had. A few days of sun and warmer temperatures will change plant colors quickly.
Growers, Check Corn Stands NOW
Go to the fields NOW and scout for early-season insects, even in unexpected places such as fields planted with Poncho 250 treated seed.
Stalk Borers Forecasted to Begin Movement Into Corn
Stalk borers will be moving from grassy areas adjacent to corn into border rows in the next few weeks.
Degree days - Crops in Good Condition Despite Cool Temperatures
by Rich Pope, Corn and Soybean Initiative
The 2009 growing season finished off May a bit cool, with degree day accumulations for only one of the nine crop reporting districts, west central, besting its long-term average. May was marginally cooler in the east, although that is not a problem, and crops are off to a great start statewide.
Cancellation of Furadan (carbofuran) for Crops Use
There are several factors that producers need to consider in light of the EPA's ban on carbofuran, the active ingredient of FuradanT 4F.
June 1 Iowa Crop and Weather Report
By Doug Cooper, Extension Communications Specialist
The June 1 Iowa crop and weather report includes interviews with Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope, and soybean agronomist Palle Pedersen.
Pedersen reports soybean planting is near complete. He says the time is right to go to the fields and count stands to determine if replanting may be necessary.
Taylor talks of El Niño's return by early August, which could benefit soybeans more than corn.
Dynamic Black Cutworm Action Threshold
Make decisions about treating black cutworm by placing current economic and yield factors into a spreadsheet designed by ISU Extension specialists. Spreadsheet is downloadable from this article.