Micronized Sulfur in Leaf Spot Management Peanut Notes No. 201 2025
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Collapse ▲This morning, I had a question about sulfur applied with fungicides. LeAnn and I have discussed results from a “rescue” treatment of Provost Silver plus Microthiol Dispress applied when peanut leaves expressed about 15% incidence of leaf spot when peanuts were at optimum maturity. The context of that study was what a grower should do if peanuts are mature or close to mature and modest level of leaf spot but anticipate that digging is several weeks out due to logistics or weather. It was clear that Provost Silver plus Microthiol Dispress applied at that time was extremely helpful in protecting yield over the next four weeks after optimum maturity. Would Provost Silver by itself have been adequate? We do not know, but we think the micronized sulfur made a significant contribution.
With that said, the grower wanted to know if micronized sulfur should be applied with each fungicide over the cropping cycle. We would generally say no, if growers are applying fungicides that are considered effective. This would not be the case if you were applying tebuconazole only or azoxystrobin only or pyraclostrobin only. Micronized sulfur would be essential if that is your program. Almost no one is doing that now.
I have attached a draft report to the NC Agricultural Foundation on a leaf spot project we just completed. This provides information on how we currently see micronized sulfur use in peanut. Micronized sulfur is a good fungicide treatment on its own for leaf spot in some cases. We are still learning about how to use this fungicide.
Yesterday I was in a discussion about late leaf spot slipping through a generally effective Group 3 fungicide program. Hopefully that is an isolated case. But if not, micronized sulfur (and certainly chlorothalonil) we be essential in our fungicide programs for leaf spot disease.
Addressing Leaf Spot Issues in Peanut Jordan Final Report August 2025 Results Only