Search

 

Member Login

{{message}}

Subscribe to Our Newsletter

{{header}}

{{message}}

  • {{ error }}

New Soybean Herbicides for 2020

One of my goals in posting articles on this website is to inform producers about new products that will be available for them to use in their soybean production systems in the coming growing season.

Thus, the subject of this article is to provide details about two new herbicide products that producers can use in their battle against troublesome weeds that plague Midsouth sobyeans. Since I am not privy to proprietary information pertaining to the performance of these products, I will provide a summary of their pertinent points as stated on their labels. Additional information about the utility of these products can likely be obtained from state weed scientists and Extension specialists who may have seen them used in the field.

Perpetuo (Valent) is a new herbicide premix of Flumiclorac-pentyl (Group 14–e.g. Resource) and Pyroxasulfone (Group 15–e.g. Zidua). It can best be used for burndown and residual weed control in both field corn and soybeans. Its label states that the following weeds (among others) are controlled by preemergence (PRE) activity of the herbicide: Grasses–barnyardgrass, broadleaf signalgrass, crabgrass, seedling Johnsongrass, fall and Texas panicum, red rice, and Italian ryegrass; Broadleafs–Palmer amaranth, redroot and smooth pigweed, and prickly sida or teaweed. The label states that it only suppresses entireleaf, ivyleaf, and pitted morningglories. Its postemergence (POST) control of troublesome Midsouth weeds is limited to pigweeds (prostrate, redroot, and smooth) and prickly sida.

Perpetuo is rainfast one hour after application. It should be applied on a broadcast basis in a minimum of 15 gal. of water/acre (ground equipment) and a minimum of 7 gal. of water/acre by air. Do not apply Perpetuo more than once per year, after soybean growth stage V6, and less than 60 days before harvest. Since it is labeled for both corn and soybeans, either crop can be planted following a failed stand of the other where Perpetuo was applied PRE. Wheat can be planted following soybean after 4 months have passed following an application of the highest allowed rate of the herbicide. It can be tank-mixed with Roundup, XtendiMax, Enlist, Scout, and other herbicides to achieve in-season residual control of the above weeds when applied before stage V6.

Antares Complete (Helena Agri-Enterprises) is a premix of sulfentrazone (Group 14–e.g. Spartan), metribuzin (Group 5–e.g. Sencor), and s-metolachlor (Group 15–e.g. Dual Magnum) that is labeled for PRE weed control in soybeans, with applications to be made no later than 3 days after planting but prior to soybean emergence. Its label states that the following weeds (among others) are controlled or suppressed by PRE activity of the herbicide: Grasses–barnyardgrass, broadleaf signalgrass, crabgrass, seedling Johnsongrass, fall and Texas panicum, and red rice; Broadleafs–Palmer amaranth, morningglories, redroot, smooth, and spiny pigweed, sicklepod, sesbania, Pennsylvania smartweed, and prickly sida or teaweed.

As with most if not all soil-applied herbicides, Antares Complete must receive ½ to 1 in. of rainfall or irrigation within 7-10 days of application to be effective. Otherwise, a POST application of labeled herbicide(s) must be applied for optimum weed control. Since the amount of this herbicide that is available in the soil solution is primarily determined by soil texture (coarse, medium, and fine–click here for a soil texture calculator), soil pH, and soil organic matter content, it is important to know these soil properties at the site of application so that the proper rate of the herbicide is applied. Do not apply to soils classified as sands or to soils with <1% organic matter. Apply a minimum of 10 gal./acre of spray solution by ground or a minimum of 5 gal./acre by air. Do not make fall applications of this herbicide in the Midsouth, and do not apply more than 4 pints/acre per crop year. Rotational restrictions for corn and cotton are based on rate of the herbicide that was applied to the soybean crop. Wheat can be planted 4.5 months following a soybean crop that has received Antares Complete. Since one component of this herbicide mix is metribuzin, click here to check for soybean varieties that may be sensitive to this component.

Important point: the above are new premixes of currently available active ingredients–i.e., they do not contain active ingredients with new modes of action. Therefore, they should be considered a part of the arsenal of herbicides that is available to control targeted weeds, especially those such as Palmer amaranth that are troublesome in Midsouth soybean production systems.

Composed by Larry G. Heatherly, Apr. 2020, larryheatherly@bellsouth.net