1)The current rainfall event that is occurring in many parts of Georgia will likely result in Valor (flumioxazin) injury in some peanut fields. I do not feel they need to reinvent the wheel, so please check out the following previous 6 blogs where I have addressed the Valor/peanut injury issue:
June 3, 2013: https://ugaweedscience.blogspot.com/2013/06/valor-injury-on-peanut-prostko.html
May 20, 2014: https://ugaweedscience.blogspot.com/2014/05/peanut-injury-update-prostko.html
May 26, 2017: https://ugaweedscience.blogspot.com/2017/05/valor-injury-or-sky-is-falling-prostko.html
May 21, 2020: https://ugaweedscience.blogspot.com/2020/05/valor-injury-on-peanut-is-likely-prostko.html
May 23, 2021:https://ugaweedscience.blogspot.com/2021/05/irrigating-peanut-fields-treated-with.html
May 13, 2023: https://ugaweedscience.blogspot.com/2023/05/valorpeanut-injury-again-prostko.html
TAKE HOME POINT FOR THE VALOR/PEANUT INJURY ISSUE: VALOR INJURY IS LIKELY BUT YIELD LOSS IN NOT!
2) Peanut growers who have missed the recommended application timing for applying Valor + Strongarm + Prowl or Sonalan (PRE) should not panic. My suggestion would be to let the peanuts emerge, then treat herbicide "naked" fields with an EPOST application of Gramoxone + Storm or Basagran + Zidua or Anthem Flex + NIS (Page 221 of 2024 UGA Pest Control Handbook). I usually do not have a preference between the Group 15 herbicides (Anthem Flex, Dual Magnum, Outlook, Warrant, Zidua). However in fields that were not treated with any Prowl or Sonalan, I do prefer Anthem Flex or Zidua in the first EPOST treatment because these herbicides provide slightly better control of Texas panicum (i.e. bullgrass or buffalograss). Check out the picture below from my 2023 research plots. No PRE herbicides were applied (on purpose) but I was still able to obtain very effective weed control. This situation is not ideal but growers can make it work.
