Length of Leaf Spot Suppression with Miravis plus Elatus Peanut Notes No. 188 2026

— Written by David Jordan | July 31, 2026 (Updated: July 31, 2026, 12:18 p.m.)

Fungicides being applied in peanut in early July

I recently had a discussion with an excellent farmer about how soon a fungicide spray should follow Miravis plus Elatus. This farmer is risk averse and is anticipating rain early next week. The 21-day interval after Miravis plus Elatus is Wednesday August 5. Here is my text to the farmer. I have also included data tables associated with the research mentioned. The link to the full article is also provided.

Couple of thoughts on Miravis/Elatus (ME) and the next spray. I know we are in a cycle of rain (but I also know the spigot could turn off at any moment.) ME is very expensive and the extended interval beyond 2 weeks is the only way that treatment pencils out. Depending on the product it is being compared with, ME is about twice the cost. We did a lot of work when it first came out (Miravis) and demonstrated that you could get 4 weeks of protection from leaf spot with a single ME spray. If you were delayed to 5 weeks, leaf spot control and yield dropped off. Overtime, especially in the southeastern US, control has decreased with Miravis when people were expecting 4 weeks of protection. In some cases, with 3 weeks. I’m not sure if the decrease in sensitivity to the pathogen has been documented, but the ME program has been used a lot for almost a decade, so there could be some resistance developing. We have not observed the issues up here that the folks in the southeastern US have, at least to the same extent. We have better rotations (longer) and fewer peanuts, and I know that helps.

All this to say, if you spray at about 16 days with ME, I think it is very conservative. If you waited until 21 days to spray and then got rained out until 28 days, you would most likely not sacrifice protection from leaf spot. If it got so wet you were delayed until about 35 days, there would be slippage in control. But that’s 3 weeks from now. You are planning on a Provost Silver spray next, and that has some curative activity if that spray gets delayed.

Nothing inherently wrong with a short interval of ME other than expense. Even with a 21-day program, we have pretty good information showing you have at least one more week where protection is adequate.

https://acsess.onlinelibrary.wiley.com/doi/abs/10.1002/cft2.70021

Table 1. Fungicide regimes during the cropping cycle.^a
First fungicide spray	Second fungicide spray		Third fungicide spray^b	Fourth or fifth fungicide spray^b
First fungicide spray	Fungicides	Interval prior to third spray	Third fungicide spray^b	Fourth or fifth fungicide spray^b
		days
No fungicide	No fungicide	-	No fungicide	No fungicide
Chlorothalonil	Miravis plus Elatus	-	No fungicide	No fungicide
Chlorothalonil	Miravis plus Elatus	21	Chlorothalonil plus tebuconazole	Chlorothalonil plus tebuconazole or chlorothalonil
Chlorothalonil	Miravis plus Elatus	28	Chlorothalonil plus tebuconazole	Chlorothalonil plus tebuconazole or chlorothalonil
Chlorothalonil	Miravis plus Elatus	35	Chlorothalonil plus tebuconazole	Chlorothalonil plus tebuconazole or chlorothalonil
^aChlorothalonil, pydiflumetofen, flutolanil, azoxystrobin plus benzovindiflupyr (Miravis plus Elatus), and tebuconazole applied at 1.25, 0.044, 0.95, 0.27, and 0.2 lb/acre, respectively. ^bChlorothalonil plus tebuconazole was applied 14 days after spray 3 and is referred to as spray 4. A second application of chlorothalonil plus tebuconazole, referred to as spray 5, was made 14 days following spray 4 if the application was made in August. If spray 4 was made in September, tebuconazole was not included with chlorothalonil as spray 5.

Table 2. Peanut canopy defoliation and yield based on the interval of the second and third spray in the fungicide regime in the experiment with the cultivar Bailey II.^a
Second fungicide spray^b	Interval between second and third fungicide spray^c	Canopy defoliation	Peanut yield
	Days	%	lbs/acre
No fungicide	No fungicide	52 a	4,190 c
Miravis plus Elatus	No fungicide	15 b	4,510 b
Miravis plus Elatus	21	1 c	4,840 a
Miravis plus Elatus	28	2 c	4,800 a
Miravis plus Elatus	35	6 c	4,660 ab
^aMeans within a column followed by the same letter are not statistically significant based on Tukey’s HSD test at α = 0.05. Data are pooled over 14 site-year combinations from 2019-2022. ^bPydiflumetofen, flutolanil, and azoxystrobin plus benzovindiflupyr (Miravis plus Elatus) applied at 0.044, 0.95, and 0.27 lb/acre, respectively. ^cChlorothalonil (1.25 lb/acre) plus tebuconazole (0.2 lb/acre) was applied at 21, 28, or 35 days after the pydiflumetofen treatment. Additional chlorothalonil plus tebuconazole or chlorothalonil applications were maintained on a 14-day interval throughout the remainder of the cropping cycle.

Table 3. Peanut canopy defoliation and yield based on the interval of the second and third spray in the fungicide regime in the experiment pooled over the cultivars Bailey II, Emery, and Sullivan.^a
Second fungicide spray^b	Interval between second and third fungicide spray^c	Leaf spot incidence	Canopy defoliation	Peanut yield
	Days	^{_____________}% ^{_______________}		lbs/acre
No fungicide	No fungicide	99 a	65 a	4,360 c
Miravis plus Elatus	No fungicide	98 a	42 b	4,530 bc
Miravis plus Elatus	21	27 c	8 c	5,260 a
Miravis plus Elatus	28	32 c	9 c	5,160 a
Miravis plus Elatus	35	44 b	13 c	4,750 b
^aMeans within a column followed by the same letter are not statistically significant based on Tukey’s HSD test at α = 0.05. Data are pooled over 5 site-year combinations and three cultivars in 2021 and 2022. ^bPydiflumetofen and azoxystrobin plus benzovindiflupyr (Miravis plus Elatus) applied at 0.044 and 0.27 lb/acre, respectively. ^cChlorothalonil (1.25 lb/acre) plus tebuconazole (0.2 lb/acre) was applied at 21, 28, or 35 days after the pydiflumetofen treatment. Additional chlorothalonil plus tebuconazole or chlorothalonil applications were maintained on a 14-day interval throughout the remainder of the cropping cycle.

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Written By

David Jordan Extension Peanut Specialist