July 11, 2017   
  Issue 8  

Prepared by

Paul Kassel

Extension Field Agronomist



(712) 262-2264

Email: kassel@iastate.edu 



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



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Soybean yield, dicamba drift. Soybean plants are very sensitive to small amounts of dicamba.   Some area fields with non RR Xtend varieties are showing some crop response.
Dicamba drift that occurs in the vegetative stages on dicamba susceptible varieties usually has minimal yield impact. However, potential for yield damage increase as the soybean plant progresses into the reproductive stages. Yield impact is often correlated with amount of height reduction.
Read more
-  pictures of symptoms at different doses.
-  Slide 10 of this presentation has some recent research on dicamba drift at the V2 stage - about the current stage of soybean development.
Confirm waterhemp resistance. Some fields have waterhemp that appears to survive Flexstar/Cobra/Ultra Blazer applications. The University of Illinois can analyze for PPO/Group 14 and glyphosate resistance. Cost is $50.00 plus overnight freight.
Corn Progress.   The Useful to Usable website uses to local information to predict crop development and crop maturity.   The following are some predicted dates with a 101-day hybrid planted in northwest Iowa.
Plant date                         silking date                                     black layer date
April 17                        July 14                                                 September 7
April 24                        July 15                                                 September 10
May 7                           July 19                                                 September 14
Extreme cool or hot weather conditions could change these predictions - but this shows the effects of the recent hot July conditions on crop growth.

Northwest Research Farm field day.
The summer field day at the Northwest Research Farm is on July 12 from 9:00 to 12:30. Speakers include Chad Hart, Erin Hodgson, Ryan Bergman, Joel DeJong and Paul Kassel. 

Prepared by Paul Kassel, Extension Field Agronomist

Phone: (712) 262-2264, Email: kassel@iastate.edu