Spots on Leaves and Fungicide Programs Peanut Notes No. 145 2021

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Question:

Do these look like early leafspot or irregular leafspot to you? The grower is getting ready to put Miravis+ tebuconazole but was a little worried if it’s early leafspot. I’m really having trouble deciding.

Jordan Answer:

I think it is not spots reflective of leaf spot caused by a pathogen. Also looks like it is up in the canopy. The fungicide program the farmer is getting ready to spray is really really good for leaf spot, so I think that is the best management practice.

Keep in mind that tebuconazole at registered use rates will not last 4 weeks. Miravis has performed well and I have seen it consistently provide 4 weeks of control.

Follow up Comments:

Ok, thanks. We already put out one good shot of tebuconazole with our Bravo two weeks ago also so I was hoping that would help along with a good shot this time. We’ve been doing that combo for a couple of years now and it seems the two early shots of tebuconazole has done a really good job keeping soil-borne diseases under good control( pretty much no problems at all)  and for so much cheaper than the Miravis/ Elatus. That Miravis-Elatus combo is just so dang expensive. It’s one reason I was a little concerned about the leafspot though because I knew Elatus with the Miravis might be a better choice if leafspot was already there. I am trying some Miravis/Elatus in a few fields with bad a history of Sclerotinia though.

Shew Answer:

I agree with David- those spots don’t look like leaf spots. Miravis is a excellent leaf spot fungicide and does not need “help” from Elatus to be effective against leaf spot. Bailey, Bailey II and Sullivan have good stem rot resistance and do very well with one or two teb applications. Your approach is good – glad it’s working for you.

Spots on Leaves