Crops Bulletin
July 3, 2013
Issue 7

Prepared by

Paul Kassel

Extension Field Agronomist


Serving Clay, Buena Vista, Dickinson, Emmet, Hancock, Kossuth, Palo Alto, Pocahontas, Sac and Winnebago Counties


The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Many materials can be made available in alternative formats for ADA clients. To file a complaint of discrimination, write USDA, Office of Civil Rights, Room 326-W, Whitten Building, 14th and Independence Avenue, SW, Washington, DC 20250-9410 or call 202-720-5964.




Goss's Wilt:   Goss's wilt was prevalent in area corn fields in 2010 and 2011. Goss's wilt of corn can often occur after fields are exposed to high winds and/or hail damage. The causal bacterium of Goss's readily infects corn leaves through wounds.  This University of Illinois article explains the appearance and symptoms of Goss's.


Storing Soybean Seed: Some recent research by ISU shows that soybean seed does not maintain seed quality past 9 or 10 months. This research showed that conditioned storage that maintained 50 degrees and 50% relative humidity helped to reduce the decline of seed quality. Soybean seed stored in non-climate controlled warehouse or machine shed facilities are unlikely to maintain quality for 2014 planting season.


Soybean Aphids: Soybean aphids have been found near Sioux Rapids on June 28. The numbers of aphids were very low and would not be considered a problem at this time. However, check soybean fields for aphid activity. Early planted soybean fields without an insecticide seed treatment would have a greater chance of infestation.


Corn Borer: Check fields for corn borer where non-Bt corn borer hybrids were planted. Non-Bt corn that is taller than the 17-21 leaf height is susceptible. It takes about one corn borer larvae per plant to justify treatment. This article has a dynamic threshold spreadsheet to help figure costs and benefits from insecticide treatment.



Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: