Georgia Weeds: Valor Clean-Up, Morningglories, and Ziddua

Photo by Eric Prostko

A few things based upon my telephone calls and e-mails this week:

1. Growers must not cut corners when cleaning a sprayer after Valor has been used. Heard someone say this week that if you cut out the corners, you just go in circles.  I have discussed this tank-cleaning issue in a previous blog (June 3, 2013).

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2. Field corn growers might be able to use a lay-by rig for cleaning up some messes or improving annual morningglory control. In the past, I have talked alot about Evik (ametryn) but I have had some trouble with the formulation this year.

If a grower decides to use Evik, he/she must pre-slurry, have aggressive tank agitation, use 20 GPA, and get new product. There have been some older and bad batches of Evik out there.

There are other lay-by options such as Gramoxone (paraquat) and Aim (carfentrazone). Currently, I am investigating the potential for Laudis (tembotrione) to be used in a lay-by rig.

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3. Growers who are considering using a dicamba product for pigweed or morningglory control in field corn need to be reminded that the use rate in field corn (0.25 lb ae/A) is 1/2 of the use rate in Xtend cotton/soybean (0.50 lb ae/A). Thus, it is highly unlikely that dicamba in field corn will control a large escaped pigweed plant (>3″ tall).

4. Zidua, Zidua, Zidua???????  Tons of questions about this new peanut product. Based upon all the work I have done since 1997, I have seen no differences in performance between Dual Magnum, Warrant, and Zidua when used in our recommended peanut weed control programs. I have also discussed this topic in a previous blog (May 23, 2017).

There might be some minor differences between these herbicides on individual weed species but these differences tend to disappear when a complete weed control program is used.


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