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: kassel@iastate.edu