Late Leaf Spot Dialogue Peanut Notes No. 202 2025
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Collapse ▲Question: (images were identified as late leaf spot on the underside of leaf)
Can you give me your thoughts?
Provysol/tebuconazole
Lucento
Provost end of last week
Jordan:
If this is in top of the canopy it is chemical burn and not leaf spot we spray fungicides for. I don’t think it is leaf spot “disease.” I have not seen any leaf spot in my non-treated controls yet. Are there any spots low in the canopy.
Follow Up:
I see a lot of top of canopy that is necrotic underside of leave. This is was down in canopy and had the black spores under side of leaf.
Jordan:
Checking now. Glad you have Provost out there for curative action.
Follow Up:
I’m worried about group 3s. Some of my worst fields last year growers switched my recommendation from Revytek to Provysol due to cost. Then followed with Provost the next spray.
Jordan:
Just got verification from David Langston this is late leaf spot.
Provost Silver is good in terms holding back more infection that might have already occurred. I’ll follow up with more information.
Follow Up:
I checked plots just up the road. These 2 farms way worst that checks in plots for some reason.
Jordan:
I talked to David, and going forward, with the spray program history you have, Chlorothalonil plus Tebuconazole next. Probably stay on a tight schedule from here on.
Definitely understand the concern on Group 3. Tebuconazole is contributing very little in the Provost Silver product in terms of leaf spot. It is still active against stem rot. Protection from leaf spot is driven by efficacy of prothioconazole. Provost Silver has been an important component of disease management for quite a while now. We are putting a lot of selection pressure on the prothioconazole component. Not as intensely as we did for Tebuconazole in the decade after Folicur came out. But certainly some pressure.
I suspect we should not be too surprised.