Miravis and Elatus Applied Late for Sclerotinia Blight Peanut Notes No. 210 2023

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I am not sure on inventory for Omega 500. That fungicide is very effective on Sclerotinia Blight. Fontelis has activity but is less effective than Omega 500 on this disease. Over the past few years many growers have rightly assumed Miravis plus Elatus will give protection from leaf spot, stem rot and Sclerotinia blight. There may be a tendency to apply this fungicide combination now as we move into September. Stem rot will be much less active at this point in the season. Leaf spot will continue through September in many areas and the likelihood of Sclerotinia blight being an issue will only increase in September and October.

If you decide to spray Miravis plus Elatus for Sclerotinia blight, keep in mind this can push us closer to resistance with leaf spot (to Miravis) if we don’t follow up the Miravis plus Elatus spray with fungicide(s) with a different MOA. Chlorothalonil is the most obvious choice. See the previous post on other options that have curative activity on leaf spot. Regardless of choice, we need to follow Miravis plus Elatus with other fungicides in September for resistance management.