University of FloridaSolutions for Your Life

Download PDF
Publication #SS-AGR-351

 

Rainfast Time for Postemergence Herbicides Commonly Used in the Everglades Agricultural Area: Quick Reference Sheet1

D.C. Odero2

If rainfall occurs soon after herbicide application, it can affect the effectiveness of postemergence herbicides. Certain postemergence herbicides differ in their time requirements for rain-free periods (rainfast) following application. The exact time required to protect herbicide activity and efficacy will vary with weed species, environmental conditions, and other factors, including the type of adjuvant added to the spray mix. It is important to always READ THE LABEL instructions on rainfastness before applying postemergence herbicides during periods when rainfall is frequent. For more information on rainfastness and pesticide use, see the EDIS publication PI238 – Rainfastness of Pesticides (http://edis.ifas.ufl.edu/pi238).

The table below (Table 1) shows the required time interval between herbicide application and rain-free period for postemergence herbicides commonly used in sugarcane and vegetable production in the Everglades Agricultural Area and the surrounding region.

Tables

Table 1. 

Rainfast time for postemergence herbicides commonly used in the Everglades Agricultural Area.

Herbicide

Common name

Hours until rainfast

Aim

Carfentrazone

1

Aatrex 

Atrazine

4

Atrazine (various)

Atrazine

4

Asulam (various) 

Asulam

48

Asulox 

Asulam

48

Banvel 

Dicamba

4

Basagran

Bentazon

4

Cadet

Fluthiacet

4

Callisto

Mesotrione

1

Clethodim (various)

Clethodim

1

Dicamba (various)

Dicamba

4

Envoke

Trifloxysulfuron

3

Evik

Ametryn

4

Goal/Goal Tender

Oxyfluorfen

1

Gramoxone Inteon

Paraquat

0.25–0.5

Glyphosate (several)

Glyphosate

1–4

Poast

Sethoxydim

1

Metribuzin (various)

Metribuzin

6

Pursuit

Imazethapyr

1

Reflex

Fomesafen

1

Roundup Original Max

Glyphosate

1–2

Roundup PowerMax

Glyphosate

0.5

Roundup WeatherMax

Glyphosate

0.5

Sandea

Halosulfuron

4

Select/Select Max

Clethodim

1

Shapern

Saflufenacil

1

Touchdown

Glyphosate

0.5–1

Touchdown CT

Glyphosate

0.5–1

Touchdown Total

Glyphosate

0.5–1

Yukon

Halosulfuron + Dicamba

4

2,4-D amine (various)

2,4-D amine

6–8

2,4-D ester (various)

2,-4-D ester

1–3

Footnotes

1.

This document is SS-AGR-351, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date August 2011. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

D.C. Odero, assistant professor, Agronomy Department, Everglades Research and Education Center -- Belle Glade, FL; Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, 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 do not signify our approval to the exclusion of other products of suitable composition. Use pesticides safely. Read and follow directions on the manufacturer's label.

The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other extension publications, contact your county Cooperative Extension service.

U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, Dean.