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Herbicide Burndown Reminders – Getting a Clean Start

Apr 09, 2013

Featured Seedsman: Stanley Knepp, Indiana,

Just ahead of planting season is a good time to discuss tips related to burndown herbicide applications.

Benefits. There can be several benefits to a successful burndown application, including control of winter annual and early summer annual weeds, increased soil warming, and preservation of soil moisture. When removed in a timely manner, there is less of a chance that weeds will hinder seed-to-soil contact or get balled up in the residue managers or other parts of the planter during planting. Controlling weeds early in the season can also reduce the risk of insects, such as black cutworms, laying their eggs in fields with ample winter annuals.HerbicideBurndown

Timing. Three important factors to consider when making a burndown application are if the field is fit, the size of the weeds, and if there are any plant back restrictions for the herbicide being applied. While it is important to control weeds when they are small and follow plant back restrictions, making applications in fields that are too damp can cause issues throughout the growing season. Burndown herbicide applications often include a Roundup® brand agricultural herbicide tank mixed with 2,4-D or dicamba. The decision between 2,4-D or dicamba depends on weed species, crop, and plant back restrictions. When applying Roundup agricultural herbicides, it is important to take into account that they work best when weeds are actively growing. It can often take three to four weeks for weeds to die. Cool temperatures can slow the activity of Roundup agricultural herbicides.

Rate. The largest or the most difficult to control weed, not the most prevalent weed, should determine the rate of a Roundup agricultural herbicide to be applied. For example, if a field has predominantly 3- to 5-inch henbit, but also has 8- to 12-inch giant ragweed, the recommended rate would likely be determined by the giant ragweed since it has a higher labeled rate than the henbit.

Residual Herbicides. A preemergence residual corn or soybean herbicide can help provide for weed control later into the growing season. Depending on the timing, herbicide to be applied, crop to be planted, and target weed, the residual herbicide application could be a separate application or part of the burndown tank mixture of Roundup agricultural herbicides and 2,4-D or dicamba.

AMS. Including AMS in the spray mix helps maintain the effectiveness of Roundup agricultural herbicides in hard water or when mixed with residual herbicides. AMS should be added to the water before Roundup agricultural herbicides.

Crop Safety. Labels of different formulations of 2,4-D and dicamba herbicides can vary in terms of recommended rate and plant back restrictions. There can be considerable differences in plant back restrictions between the different 2,4-D and dicamba formulations. Please refer to specific individual 2,4-D, dicamba, and residual herbicide labels for rate recommendations, plant back restrictions and other important information to help you obtain good weed control while maintaining crop safety.

Ultimately, well timed burndown and residual herbicide applications, applied at the appropriate rate, can help provide good weed control, which is one step toward protecting the yield potential in your fields.

To learn more about tips related to burndown herbicide applications, contact Stanley Knepp from Indiana ( or your local Channel Seedsman.

Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible.

ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Tank mixtures: The applicable labeling for each product must be in the possession of the user at the time of application. Follow applicable use instructions, including application rates, precautions and restrictions of each product used in the tank mixture. Monsanto has not tested all tank mix product formulations for compatibility or performance other than specifically listed by brand name. Always predetermine the compatibility of tank mixtures by mixing small proportional quantities in advance. Roundup® is a registered trademark of Monsanto Technology LLC. ©2013 Monsanto Company. 04092013EJP

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