August 16, 2018   
  Issue 3  

Prepared by

Paul Kassel

Extension Field Agronomist



(712) 262-2264




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.


The Iowa State University Extension and Outreach Policies Page.  


























Focus on Nitrogen Field day . There will be a nitrogen management field day  at the ISU Northwest research farm at Sutherland on Tuesday August 21 from 9:30 to noon. Topics will include N rates, N timing, N additives, and N research at the NWRF. Register by texting your intentions to 712 540 1085 or email . Cost is $10 and includes refreshments and lunch.
Soybean aphids. The yield benefit for treatment for aphids declines after the late R5 stage/early R6 stage. The R6 stage is where the soybean seed completely fills the pod at one of the top four nodes of the plant.
Thresholds are less clear at the late R5 stage/early R6. Info from the University of Minnesota suggests that treatment for aphids at the early R6 stage can be beneficial if dry soil conditions are prevalent.
Soybean gall midge. The  soybean gall midge has caused damage to the soybean crop in northwest Iowa. Look for dead or wilted plants, swollen lower stems, and small clear to orange maggot sized larvae at the base of the plant. Infested plants will easily break at the soil line.
Little is known about life cycle, extent of infestation and future potential damage from this insect. Feel free to report any suspected infestations to Erin Hodgson ( or Paul Kassel.
Late season cover crops. Flooded areas or prevented plant acres can still benefit from a  late summer seeded cover crop. Consider:
-  Oats will provide some cover, soil health benefits and will not overwinter.
-  Cereal rye or winter wheat will provide soil health benefits, will overwinter and will need to be terminated next spring.
-  Brassicas - such as forage turnips or forage radishes will provide soil health benefits and will not overwinter.
-  All of these options will provide some potential for livestock grazing. An oat crop may provide some harvestable fall forage.


Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: