Crops Bulletin
July 24, 2015  
Issue 11                    
 
 

Prepared by

Paul Kassel

Extension Field Agronomist

 

Phone: 

(712) 262-2264

Email: [email protected] 

 

 

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.

Northern corn leaf blight (NCLB).  NCLB has not developed as fast or as severe as thought earlier this season. However, continue to check cornfields for this disease.

 

-check hybrid susceptibility - to help prioritize fields.

-Consider treatment when

  • 50% of plants have NCLB up to and past the ear leaf
  • the hybrid is rated susceptible
  • cool wet weather is forecast.

-Most fungicides are effective - this Purdue publication rates fungicide efficacy for different fungicides.

 

Fungicide Use on Soybean: Fungicide applications for soybean should be applied at the R3 stage  (3/16 inch pod at one of the four uppermost nodes). Foliar fungal diseases of soybean are at low levels this year.  

 

However, fungicide applications to soybean have increased soybean yields when foliar disease levels are low. Research in northwest Iowa has shown a yield benefit with fungicide applications on R3 stage soybean. A searchable summary of studies by the Iowa Soybean Association has data on fungicide applications.

 

 

Weeds Week. Join us August 6 at the ISU NW Research farm near Sutherland for an educational program on resistant weeds and effective herbicide use.

-farmers - registration at 9:00, program 9:30 to noon, lunch at noon.

-retailers - lunch at noon, program at 1:00 to 3:30 (2.5 CCA PM CEUs).

-Preregistration is requested by August 2. Cost is $25 and includes lunch.

 

There is a Twitter trivia contest for Weeds Week. Follow @PaulKassel or @ISUCrops on Twitter and if you answer the trivia question correctly - you will be entered into a drawing for a free registration.

Crop Moisture use. Northwest Iowa is now listed as abnormally dry on the most recent edition of the Drought Monitor. The corn and soybean crop is currently at its peak moisture demand. The Nebraska Ag Water Management Network shows that that both the corn and soybean crop are using about 0.27 inch of water per day for the week of July 23.

    

 

 
  

 

  
 

 

 

 

Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: [email protected]