Fungicides for Stem Rot and Leaf Spot Disease Peanut Notes No. 157 2023

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In the Peanut Extension Portal, there is a way to provide anonymous feedback to the Peanut Notes that we postWe appreciate all of the comments. A recent comment indicated that a post was not helpful because it did not state what fungicide to use for white mold (stem rot) control. I understand where that comment is coming from. The reason all of the options were not listed in Peanut Notes is because we have many options to select from for both stem rot and leaf spot. Rather than repeat ourselves in a Peanut Note, we point you to detailed information elsewhere. In the Peanut Disease Management chapter (pages 101-145 in 2023 Peanut Information), all of the products used for these diseases can be found. The 2023 Peanut Information guide is available in hard copy format through your local NC State Extension office. It is also available in electronic format on this Peanut Extension Portal using the menu bar. Similar information is available from other states in the region.

Virginia Tech – 2023 Virginia Peanut Production Guide

Clemson – Peanut Money-Maker 2022 Production Guide

In North Carolina, many farmers are on their third spray for leaf spot and stem rot. We generally make 5 or 6 sprays (assuming efficacy for two weeks with each spray.) One of the many options for stem rot should be included in sprays 2, 3 and 4 (generally mid-July through the month of August.) Fungicides that protect peanuts from leaf spot disease should be applied throughout the month of July and August and in some cases, depending on peanut maturity and weather patterns, throughout the month of September.

A major key to successful protection from these diseases is timely application of fungicides using recommended rates. It is also important to rotate modes of action to minimize the likelihood of selecting for resistance, especially for fungicides that are vulnerable to resistance.

If the production guide seems complicated in terms of what to use (and I know this can be the case for this decision and many others,) please reach out to your local NC State Extension agent for assistance in developing an effective spray program.