Fungicide Selection and Nitrogen Peanut Notes No. 176 2024

— Written by David Jordan | July 30, 2024 (Updated: July 30, 2024, 2:35 a.m.)

Question:

Good morning, I have many growers that are going to be making second fungicide applications this week. We have had from 5 to 12 inches of rainfall in the past two weeks. Most growers either used Bravo/Alto or Aproach Prima on the first spray which was two weeks ago. There are many options for this second spray. Many were thinking Miravis/Elatus (or another stem rot material) or Provost. With the amount of rainfall and weather conditions we have had, would you suggest going with Provost versus Miravis/Elatus in case we had some leaf spot come in during this rain event? Thoughts on fungicide choice? If we go with Provost this time in place of Miravis/stem rot material would that be made next spray to split the Provost sprays.

What are thoughts on applying ammonium sulfate this week? Growers usually make that application mid July?

Jordan:

If there are any doubts about a gap in protection, I would use Provost Silver as we know it has curative activity. Miravis does not have curative activity. There is no issue with switching the sequence of Provost Silver and Miravis plus Elatus.

I don’t recommend a general application of AMS. If there is not a clear N deficiency, I don’t think we gain from a N application. We may see yellow peanuts but that is from cloudy weather and limited photosynthesis. Certainly the bacteria that fixes N struggle under wet conditions. But my impression is that when the sun comes out and fields dry, peanuts will begin to green up.

This would be a season where a response to AMS might occur given wet soils and yellowing of peanuts. Hope we capture these conditions in on farm trials.