Recent Peanut Problems (Copperleaf, Roundup, Mixing Order, 2,4-DB Rain-Free Period) - Prostko

A few interesting things that crossed my path over the last few weeks:  

1) From Macie Mosteller in Turner County.  Hophornbeam copperleaf in peanut.  Way too big now for herbicides (but not hands or hoes).  Ultra Blazer (acifluorfen) and Cobra (lactofen) are 2 POST control options for smaller copperleaf plants.  Check out this older fact sheet for more info about hophornbeam copperleaf in peanut:

https://secure.caes.uga.edu/extension/publications/files/pdf/C%20882_5.PDF

2) From former legendary Dodge Co. Agent Greg Slaughter (now with RW Griffin).  Roundup (glyphosate) contamination on peanut.  Grower sprayed Cadre (imazapic) + 2,4-DB + Basagran (bentazon) + Dual Magnum (s-metolachlor) + COC.  Sadly, this happens a lot (too much) in south Georgia.  Tissue samples sent to Waters Lab in Camilla confirmed the presence of glyphosate (0.3 ppm). How did it get there? Jug management????? Check out this older fact sheet for more info about peanut tolerance to glyphosate:  

https://archive.ces.ncsu.edu/wp-content/uploads/2014/10/PEANUT-NOTES-No.-104-2014-UGA-Glyphosate-on-Peanut.pdf?fwd=no

3) From Bill Tyson in Bulloch Co. The tank-mix blues strike again! Mixing order is important!! A slight change in mixing order helped fix this problem.  Check labels for proper mixing orders. Tons of good info in those labels!

4) It has come to my attention that the rain-free period for 2,4-DB listed in the peanut section of the 2025 UGA Pest Control Handbook of 1 hour (page 222) is NOT correct.  Not sure where I came up with the 1 hour since nothing specific is listed on any label nor is it consistent with other sources? After talking with technical folks at Albaugh, LLC (makers of Butyrac 175 or Butyrac 200), the rain-free period for 2,4-DB should be 6 hours.

Florida Beggarweed in Peanut (Prostko)

I was texted the following picture (slightly blurry) early yesterday morning from a SW-GA crop consultant.  He commented that it was all over the field.

This is Florida beggarweed (kidney-shaped cotyledons).  When I first got to GA in 1999, Florida beggarweed was the #1 peanut weed.  It became less troublesome when Valor (flumioxazin) was registered in 2001 (very effective) and when Palmer amaranth exploded. Florida beggarweed tends to be a later emerging weed and prospers during wetter conditions. 

At this point in the growing season, there are not many good options for controlling Florida beggarweed in peanut. The first option is a POST (60 days after peanut emergence) application of Classic (chlorimuron).  The other option is to use Gramoxone (paraquat) in a non-selective applicator (wiper, sponge, rope-wick).  Both of these options are described on page 224 of the 2025 UGA Pest Control Handbook and/or listed below. Please carefully read the comment sections of these recommendations.  Peanut cultivar tolerance to Classic is a major concern.  If a newer peanut cultivar is not listed in the comment section (i.e. Arnie, TifNV-HG, etc.), that means I DO NOT have any tolerance data and have no clue what will happen.