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Plantback Restrictions for Herbicides Used in South Florida Sugarcane1

D. C. Odero, R. Negrisoli, M. VanWeelden, and S. Swanson 2

Although sugarcane is a relatively competitive crop, weed pressure can have a negative impact on yields. Consequently, most fields are treated with herbicides one or more times during the growing season. Regardless of whether an herbicide is primarily a pre- or postemergence product, some have the potential to persist in the soil for long periods of time. Ideally, herbicide applications would provide long-term weed control during the growing season but would dissipate to a safe level before the next crop is planted. In some situations, herbicides that persist in the soil for long periods of time can injure subsequently planted crops, or these crops can accumulate injurious herbicide residues. The potential for rotational crop injury depends on complex interactions among herbicide characteristics, soil type, soil moisture and temperature, and the sensitivity of the rotational crops. Herbicides that persist in the soil usually have a section on the product label detailing specific rotational crop (plantback) restrictions. These restrictions indicate how much time must pass between herbicide application and the planting of a sensitive crop. The rotational crop restrictions on herbicide labels take into account basic chemical properties of the herbicide, the persistence of the herbicide, typical environmental characteristics of the state or region, and the sensitivity of rotational crops.

This publication condenses rotational crop restrictions for herbicides registered for use in Florida sugarcane (Table 1). When considering the application of herbicides, it is very important to understand the effects that a persistent herbicide may have on subsequent crops. Information on herbicide labels should be used to make better decisions about the crop sequence in a rotation, about which herbicides to use or avoid in a system, and about the rate and timing of herbicide applications. When planning weed control programs, the labels for all herbicides that will potentially be used in crop rotation should be studied along with this bulletin to prevent label violations, reduce economic losses due to herbicide carryover, and avoid injurious herbicide residues.

Tables

Table 1. 

Minimum number of months following application of herbicides registered for use in sugarcane before it is safe to plant selected rotational crops.

Footnotes

1. This document is SS AGR 273, one of a series of the Agronomy Department, UF/IFAS Extension. Original publication date July 2007. Revised November 2010 and September 2018. For current recommendations, please visit the EDIS website at https://edis.ifas.ufl.edu.
2. D. C. Odero, associate professor, Agronomy Department, UF/IFAS Everglades Research and Education Center; R. Negrisoli, graduate assistant, Agronomy Department, EREC; M. VanWeelden, Extension agent, UF/IFAS Extension Palm Beach County; and S. Swanson, Extension agent III, UF/IFAS Extension Hendry County; UF/IFAS Extension, Gainesville, FL 32611.

The use of trade names in this publication is solely for the purpose of providing specific information. UF/IFAS does not guarantee or warranty the products named, and references to them in this publication does not signify our approval to the exclusion of other products of suitable composition. All chemicals should be used in accordance with directions on the manufacturer's label.

Publication #SS AGR 273

Date: 1/2/2019

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    Contacts

    • Dennis Odero