More Tank-Mix Info/Mixing Order Problems (Prostko)

Here are a few things of interest from last week:

1) Been getting a lot of questions about the use of COC (1% v/v) vs. NIS (0.25% v/v) with Select/Clethodim 2EC on peanut.  Generally, clethodim works better when applied with a COC vs. NIS (~10-15% better on some days).  But, COC increases crop injury (see below) especially when hot/dry.  In the picture below Dyne-Amic (Helena), is a combination of methylated seed oil (soybean) + organosilicone-based NIS.  Growers who are overly concerned about peanut injury could use the other formulations of clethodim (Select Max 0.97EC, Tapout 0.97EC, Intensity One 0.97EC) that already include an adjuvant, can be used with a NIS, and are less likely to cause major leaf burn (will still get some leaf burn in this weather).  

2) Check out this tank-mix. Ouch!! Class Act NG is a NIS + AMS product (Winfield).  Praiz 6F is a generic chlorothalonil (Winfield).  Domark 1.9ME (tetraconazole), from Gowan, is labeled for early/late leaf spot, web blotch, and rust.  In my opinion, the Class Act NG was not really needed and the rate of Dual Magnum could have been reduced to 16 oz/A.  This is a great example of everyone on the planet (me included) not knowing what will happen on any given day when 6 products are tank-mixed together (especially when hot/dry).  

3) Somebody asked me about tank-mixing boron with Cadre + DB + Dual Magnum + Priaxor???  Never did it before.  See below.  Not as bad as I was anticipating but it could be very different on any given day and/or when sprayed later in the PM.  

4) Check out this picture from JK.  A huge mess.  Best we could come up with after reviewing product labels and scratching our heads was an incorrect mixing order.  Mixing order matters!!!!

 

Cobra or Ultra Blazer for Large Pigweed (Prostko)

A late night text from "The Greatest American County Agent (see below and note chest logo) prompted this blog.  For you Millennials reading this, it's a spin on an 1980's TV show called "The Greatest American Hero" (https://en.wikipedia.org/wiki/The_Greatest_American_Hero).  This is what you get when you text me at 7:42 pm (Ha Ha! But all kidding aside, I am available 24/7/365 for county agents!)

What are my thoughts about controlling large pigweed in peanuts with Cobra or Ultra Blazer?

1) I do not have a preference between Cobra or Ultra Blazer if the pigweed plants are 2"-4" tall.

2) I do prefer Cobra over Ultra Blazer when plants get bigger than that. But, I would not expect any miracles when plants get larger than 4".  For the record, labeled maximum heights for Ultra Blazer (24 oz/A) and Cobra (12.5 oz/A) are 4" tall/6 leaf and 3" tall/6 leaf, respectively.

3) If plants are too big, grower is wasting his time and money on a revenge spray.

4) Other options for controlling large pigweed include hand-weeding, mechanical cultivation, and/or using paraquat in a non-selective applicator (wiper, rope-wick, etc.).

From the Field - June 2 (Prostko)

 A few things for you to consider, fresh from the field:

1) New technologies are great but you can control weeds without it.  Nothing beats starting clean, using a strong residual herbicide (activated with moisture) at planting, followed by a timely POST (with more residual).  The Palmer amaranth population in these soybean plots is both glyphosate and ALS-resistant and was at an initial density of 40+ plants/sq. ft.  Boundary is a combination of metribuzin + s-metolachlor.

2) These peanut weed control programs have worked for me for more than 20+ years (started clean).  Once again, I have not observed any differences between Prowl or Sonalan based programs.  If you don't like Dual Magnum, you can substitute Anthem Flex, Outlook, Warrant, or Zidua.  If you don't like Cadre, use Ultra Blazer or Cobra but lower your weed control expectations, especially if nutsedge and/or sicklepod are present. 

3) Don't expect to see much much from Cadre on yellow nutsedge for at least 21 days after application.  Cadre must be absorbed by both the leaves and roots for it to be the most effective.  POST applications of Cadre in dryland peanut fields that have not gotten much rain after application will likely provide less than optimum control.

4) Tank-mixes of Basagran/Broadloom (bentazon) with Cadre will NOT improve the control of yellow nutsedge.  In fact, it could cause antagonism.