Crops Bulletin
 May 18, 2017   
  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.

Black cutworm.  Black cutworm adults migrate to Iowa each year.  Moth catches have been low in Iowa this year.  
Typically black cutworm larvae are large enough to damage corn the last week of May.  No large problems are expected but check fields for damage.
This ICM News article discusses black cutworm biology, damage, scouting and management.
Palmer Waterhemp update.  Palmer waterhemp has been added to the Iowa's noxious weed law.  This will allow landowners some legal options if adjacent land is infested with Palmer waterhemp.

Zidua and Dual II Magnum have received a Special Local Needs label to be used to prevent emergence of Palmer waterhemp in conservation plantings.  Application will need to be fairly soon to be effective.
The USDA NRCS has a webpage on Palmer waterhemp as well as a technical bulletin on Palmer waterhemp management in CRP acres.
Cash rent survey.  The most recent Cash Rental Survey is available on ISU's Ag Decision Maker website.

Replant yield potential.  Corn replanting
does not appear to be the issue that it was last year.  However, a few acres get replanted each year for various reasons.
Plant populations of about 20,000 would be expected to yield about 89% of normal.  Corn replanted on May 20 is expected to yield about 87% of normal.  Therefore a population below 20,000 may be a candidate for replanting. Use this checklist to make replant decisions.

Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: