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Herbicide Carryover Concerns for Soybean in 2024
Wisconsin Ag Connection - 03/20/2024

Last spring/early summer, I probably received more calls and complaints about herbicide carryover to soybean than I had received in my entire career up to that time. Most of these cases could be directly related to the persistent drought that we experienced in many areas of the state. Unfortunately, I haven't really seen a major shift in our weather patterns from last summer through this spring that alleviates these concerns as we head into this growing season.

The potential for herbicide carryover will be determined by a variety of different factors, but for the purposes of this article I will just discuss a few that I believe are the most important and most relevant to our situation heading into 2024.

First, the likelihood of herbicide carryover is dependent on the persistence (or half-life) of the herbicide in question. In our case, the herbicides that we saw the most problem with in soybean last year were the group 27, HPPD-inhibiting herbicides like mesotrione (Callisto, etc.) and topramezone (Impact, Armezon, etc.). While these herbicides haven't historically been all that much of a concern for carryover to soybean from one year to the next, there are some conditions that are likely to increase their carryover potential. These include applications of these herbicides that were made much later than usual during the growing season than might typically occur, and/or "double-up" applications of these herbicides in corn (some amount or combination of these products were applied pre-emergence and post-emergence).

Another herbicidal active ingredient worth mentioning here is clopyralid. Along with mesotrione, I would classify clopyralid as an active ingredient that is fairly persistent and has become a more common component in a lot of corn herbicide premixes over the past few years (such as Kyro, Maverick, Resicore, Surestart II, Tripleflex II, etc.). Let me be clear that I have not received very many calls about clopyralid carryover injury to soybean, but since it is a herbicide that depends exclusively on microbial populations for its degradation, I thought it was worth noting.

A second factor that can increase the likelihood of herbicide carryover is the environmental conditions that have occurred since the herbicide in question was applied and the time you intend to plant the sensitive crop – in this case soybean.

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