Not sure what's going over the last few days in the peanut patch but I have received numerous inquires about Valor applications ahead of the anticipated rainfall over the next few days. Here are some reminders to share with overly concerned growers:
1) I have been working with Valor since 1997. Since that time, I have NO data that proves that when injury occurs, peanut yields are significantly reduced after a labeled/recommended application (3 oz/A within 48 hours after planting, at least 1.5" planting depth).
2) Valor does NOT effect peanut seed germination and radical development. Recent UGA thermogradient studies indicated that when there is direct peanut seed exposure to Valor at field application rates, there in NO impact on germination and radicle development (Source: Peanut Science (2020) 47:89-93).
3) From 2017-2019, I conducted field trials to evaluate the potential effects of high moisture conditions on peanut response to Valor. During those trials, peanuts were exposed to 8.0-11.3" of rainfall/irrigation in the first 30 DAP. Yields were NOT reduced in any year (Source: Peanut Science (2021) 48:113-117). Here is some data for the "Doubting Thomas":
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| Figure 1. Peanut yield response to Valor under high moisture conditions in 2018 (UGA Ponder Farm, Ty Ty). Peanuts were planted 2" deep and Valor was applied 48 hours after planting. 3 oz/A is the labeled and recommended use rate. |
4) Peanuts are most likely to be injured by Valor when higher rates are applied, applications are delayed past 48 hours after planting, peanuts are planted too shallow, and heavy rainfall occurs as the peanuts begin to emerge (i.e. cracking). Irrigation immediately after application will not prevent Valor injury when heavy rainfall events occur at cracking.
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Figure 2. Valor injury 17 DAP (Attapulgus, 2009). 5.44" total rainfall from planting until picture was taken. Valor was applied the same day as planting, 1.75" planting depth. |
