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Last week, Miravis (a.i. adepidyn), a FRAC Group 7 carboxamide fungicide, was registered for the control of foliar diseases in peanut. Other Group 7 carboxamide fungicides labeled for use on peanut include Elatus, Priaxor, and Fontelis. Unlike Elatus and Priaxor, Miravis contains just the a single a.i. adepidyn. As a result, following resistance management practices will be critical to maintaining the long term efficacy of all of the above Group 7 carboximide fungicides.
The efficacy of Miravis against early and late leaf spot is superior to all fungicides currently recommended for early and late leaf spot control in peanut. Performance of Miravis against late leaf spot under heavy disease pressure with nearly daily rain showers in 2017 at GCREC was impressive. Miravis does not control white mold in peanut nor does it have activity against peanut rust. To obtain white mold control, Miravis will need to be tank mixed with 7.3 or 9.5 oz/A Elatus or another fungicide with good activity against white mold. Other peanut diseases controlled or suppressed by Miravis include pepper spot, web blotch, and Sclerotinia blight. While web blotch causes some defoliation on late planted peanuts, pepper spot and Sclerotinia blight are not issues in Alabama peanuts.
In recent Alabama field studies, the recommended rate of 3.4 fl oz/A Miravis, when included in a five application fungicide program with 7.3 or 9.5 oz Elatus, provided superior early and particularly late leaf spot control than other registered fungicides. According to the label, Miravis applications can be scheduled at 21- to 28-day intervals as apposed to the standard 14-day application schedule recommended for nearly all other leaf spot fungicides. For meet resistance managment criteria, applications of the above FRAC Group 7 fungicides should be limited to no more than half of the total number of fungicide applications. While recommended Miravis-based fungicide programs have yet to be finalized, a possible five application program would include alternating applications of a chlorothalonil fungicide with Alto or similar product and 3.4 fl oz/A Miravis + either 7.3 or 9.5 oz/A Elatus or other white mold fungicide.
Miravis is a premium early and late leaf spot fungicide that may be available in 2018 in limited quantities. Additional field trials designed to evaluate the efficacy of Miravis against foliar diseases will continue through the summer, 2018 with the results being available by early 2019.
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