Replanting Field Corn and Weed Control (Prostko)

The recent frosty weather has resulted in the need for some corn fields to be replanted. Some of those fields may have already been treated with a PRE application of atrazine. Since it is likely that these fields will have to be re-tilled, there have been some questions on what to do next.  Here are a few comments to consider:

1) Field corn is extremely tolerant of atrazine so crop injury should not be a concern. 

2) The maximum amount of atrazine that can be legally be applied in a field when both PRE and POST applications are used is 2.5 lbs ai/A (i.e. 2.5 qts of 4L).

3) Atrazine could be used again PRE on the replant but that would limit the amount that could be applied POST.

4) In those fields that have already been treated with atrazine and are tilled/replanted, I would suggest that growers switch to another PRE herbicide such as Dual II Magnum 7.64EC (16-21 oz/A) or Warrant 3ME (48 oz/A).  This way, growers can use an additional 1.5 qts/A of atrazine in their POST application of glyphosate or other favorite and remain within the label restrictions. 

4) When using these chloracetamide herbicides in field corn, it is also a good idea to make sure that there are no potential hybrid sensitivity issues (really not that common).  Generally, this information can be obtained from the seed companies.  

Pioneer: https://www.pioneer.com/CMRoot/Pioneer/US/products/stewardship/2016-corn-herbicide-ProdList.pdf

Dekalb: No specific ratings for amide tolerance?

Mycogen:  Field corn hybrids rated for careful management (i.e. limit overlap and high rates) include the following: MY90R27RA, MY13K77RA, CNX157144S3, F2F499, and TMF86H77RA. 

Sprayer Clean-Out and Tank-Cleaners (Prostko)

With all the ado about 2,4-D and dicamba-tolerant crops theses days, there is some concern about sprayer cleanout after application of Enlist Duo, Engenia, Fexapan, and Xtendimax.  I would encourage all applicators to read and follow the specific sprayer clean-out instructions listed on the herbicide labels. Here are some useful links: 

2017 Enlist Duo Product Use Guide (automatic download of document - sprayer clean-out procedures listed on pages 20-21)
http://www.enlist.com/~/media/enlist/enlist-ahead/resource-pdfs/2017_enlistallcrops_pug_final.ashx

Engenia Clean-Out Recomendations:
http://agproducts.basf.us/campaigns/engenia/assets/pdf/Engenia-Spray-System-Cleanout-TIB.pdf

Fexapan Sprayer Cleanout
http://www.dupont.com/products-and-services/crop-protection/soybean-protection/articles/sprayer-cleanout.html

Xtendimax Cleanout (video presentation)
https://youtu.be/LzywJ-YSta4?list=PLWKeHPsbiIP7URV05Y03YTMfYxGLmQ3sF

I called a few local chemical dealers and the following are some commercial tank-cleaners that are currently being sold in Georgia (listed in no particular order):

1) WipeOut XS
https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/WipeOut_XS_Label.pdf

2) Valent Tank Cleaner
https://www.valent.com/Data/Labels/1714-B-ValentTankCleaner.pdf

3) Nutra-Sol Tank-Cleaner
http://www.cdms.net/ldat/ldDC2000.pdf

4) All Clear
https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/All_Clear_Label4.pdf

5) ProTank Cleaner
http://www.winfield.com/cs/groups/lolweb/@winfield/documents/web_content/ndjf/mzax/~edisp/36142_301402.pdf

6) Neutralize
http://www.cdms.net/ldat/ldDC1000.pdf