Integrated Crop Management News

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Know Your Choices: Hundreds of SCN-resistant Soybean Varieties For Iowa

October 21, 2011
SCN-resistant soybean varieties for late maturity group 0 and maturity group 1

Soybean cyst nematode (SCN) is effectively managed with resistant soybean varieties grown in rotation with corn, and Iowa growers have hundreds of SCN-resistant soybean varieties from which to pick. ISU Extension recently updated the list of SCN-resistant soybean varieties in late maturity group 0 and maturity groups 1, 2, and 3.

Frogeye Leaf Spot Resistance NOT Found in Iowa

October 17, 2011
Frog-eye Leaf Spot Pathogen

Daren Mueller, Department of Plant Pathology and Microbiology

During the 2011 season several foliar diseases were present in Iowa, including brown spot, Cercospora leaf blight and frogeye leaf spot. The disease that was noticeably higher in 2011 compared to previous years was frogeye leaf spot, at least in susceptible varieties. The pathogen that causes frogeye leaf spot, Cercospora sojina, has been in the news several times the past couple of years because of reports of resistance to strobilurin fungicides. 

End of Season Soybean Rust Update

October 17, 2011
Current distribution of soybean rust

None of the three critical steps that must happen for rust to get to Iowa happened in 2011. Soybean rust has petered out the past two seasons, allowing Midwestern growers to mentally eliminate it as a possible threat and concentrate on other issues - exemplifying the importance of an established nationwide scouting system.

Frogeye Leaf Spot Resistance NOT Found in Iowa

October 17, 2011

The possible development of resistant strains of the frogeye leaf spot pathogen to strobilurin fungicides should be a consideration as growers are deciding about foliar fungicides for 2012.

New Publication Makes Interpreting Manure Nutrient Analyses Easier

October 4, 2011

Iowa State University Extension and Outreach has recently released a publication that complements existing extension manure management resources. How to Interpret Your Manure Analysis, PM 3014, explains the value of manure sample analyses that indicate nutrient concentrations.

Frost Damage to Crops

September 22, 2011

A September 15 frost hit some northern Iowa fields, causing damage to corn and soybean fields alike, especially fields that were already experiencing some type of stress. Yield reductions caused by the frost will depend on the maturity of the crop but across the board damage does not seem significant, according to ISU Extension Corn Agronomist Roger Elmore. He reminds producers that frost damaged crops will have changes in drydown rate and test weights

Does Corn Lose Drymatter After Physiological Maturity? No

September 18, 2011

By Roger Elmore, Department of Agronomy

Iowa's corn this year reached dent (R5) development stage on pace with that of 2010, but well ahead of normal (see NASS report).  Some combines are rolling across Iowa's 14 million plus acres of corn; others will roll soon. Harvest begins. Fall approaches.

New Publication Helps Farmers Manage Energy Used for Corn Drying

September 14, 2011
Improving corn drying efficiency publication

When corn harvesting conditions allow optimal time for in-field drying, taking full advantage can reduce on-farm energy consumption. A new publication from Iowa State University Extension and Outreach explains the basic principles of energy management for grain drying.