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Estimated Effectiveness of Recommended Herbicides on Selected Common Weeds in Florida Vegetables 1
William M. Stall and James P. Gilreath2Successful weed control is essential for economic production of vegetable crops in Florida. Weeds reduce vegetable yields by competing for moisture, nutrients and light during the growing season. Weeds also harbor insects, disease pests and interfere with harvesting. Control of weeds in vegetables involves good management practices in all phases of production. The use of herbicides, cultivation, crop rotation, cover cropping, using crop competition and/or mulching may have to be combined to suppress many difficult to control weed species.
Identifying the weed problems and selecting appropriate weed control methods are essential steps in designing or modifying a weed control program. Knowing the weed species that infest the fields is also important in selecting the correct herbicide that is effective for specific weed problems. Generally, for preplant and preemergence applications, the weed problem must be anticipated since weeds have not emerged at the time of application. This can be done by observing the field in the previous season and recording those weeds which are present and in what areas of the field they occur. These weed maps can be very useful the next season in refreshing your memory and making decisions on which herbicides to purchase. Once your weed problems have been determined the following tables can be helpful in determining the herbicide which is most effective for those problems.
Table 1 and Table 2 , estimating the effectiveness of control of certain herbicides, were developed from research data, herbicide labels, and the experience of research and extension workers in Florida. Table 1 lists effectiveness estimates for herbicides on broadleaf weeds. Table 2 lists effectiveness estimates for herbicides on grasses and sedges.
The estimated effectiveness is based on recommended rates for vegetables in Florida and application procedures as specified by the label. Herbicide effectiveness may vary due to soil type, environmental conditions (rainfall, temperatures etc), method and time of application, as well as size of weeds. Consult the herbicide label for specific information relating to crop use and expected response of the herbicide under your soil type.
The herbicide listings and the use of trade names in this publication is solely for the purpose of providing information. It is not a guarantee or warranty of the products named and does not signify that they are approved to the exclusion of others.
Tables
Table 1. Estimated effectiveness of herbicides on selected broadleaf weed in vegetables.
Herbicide
Amaran-thus
Cockle-bur
Evening primrose
Eclipta alba
Florida beggarweed
Florida pusley
Parthen-ium
Lambs quarter
Pur- slane
Morningglories
Night- shade
Rag- weed
Sickle-pod
Southern sida
PREPLANT INCORPORATED
Command F-G P-F G - - G - G-E E P - F-G P - Dacthal F-G P F-G - F F - G G P F - P F Devrinol F-G P G P P G-E P G-E G P P - P - Dual G P G-E G F-G G-E - F-G F P F F P G Eptam G P G G P G-E - G G F P-F F F G Prefar F P F P P E - F-G F P P P P P Pursuit G-E - E E E F - E E G-E G-E G P G Sencor E G E G G-E G G E G G-E P G G G Treflan G-E P G F-G P E P G-E E P P P P P PREEMERGENCE
Alanap G-E F G G F G - E G F F F P G Atrazine
E G-E E G-E G-E E E E E G G E F-G G-E Caparol
G-E - - - - F-G - F-G G-E - F-G F-G - - Command
F-G P G - - G - G E P - F P - Curbit
G P G - P E P G-E E P P P P P Dacthal
F-G P F-G - F F - G G P F - P F Devrinol
F P G P P G P G G P P - P - Dual
G F G G F G - F P P F F P G Goal
E E E E G G G E E G G G F G Kerb
F-G - G - - G - E G-E F-G G - - - Lorox
G F E - G E - E E F - G - F Matrix
G-E G-E E E E - - E E - F G - - Prowl
G-E P G - P G P E G P P P P - Pursuit
G-E G-E E E P F - G-E G-E G-E G-E G P G Sencor G F E F-G G G G E G F P-F G G G POSTEMERGENCE
Aim E G E G G G - E G G E E G G-E Atrazine
G-E F E G P G-E F-G G F-G G F F F-G
- Basagran
G G G G P F - - G F-G F-G G P G Diquat
E G E E G-E G
E E G F-G G G G G Enquik
E
G E E E G G F-G G F G G G G Fusilade DX N N N N N N N N N N N N N N Gramoxone E G E E G-E G P E G F-G F G G G Lorox E G - - G G - E E F-G - G G G Matrix G G-E G G G G - P - G P G - - Poast N N N N N N N N N N N N N N Pursuit E G G G - F - F-G P-F G G G P - Select N N N N N N N N N N N N N N *Sempra/ Sandea
G G - F - P - P F G - G - - Sencor E G G F G G P G F-G P P F-G F F E = 90-100% N = no control G = 80-90% -= no data F = 60-80% P = below 60% * Poor on Livid Amaranth
Table 2. Estimated effectiveness of herbicides on selected grasses and sedges in vegetables.
Herbicide
Grasses
Sedges
Barnyard grass
Bermuda grass
Broadleaf signalgrass Crab- grass
Goose- grass
Panicums (fall & texas)
Sprangletop
Purple nutsedge
Yellow nutsedge
Annual sedges
PREPLANT INCORPORATED
Command E G-E E E E G-E - P P P Dacthal G G F G G F - P P P Devrinol E E E E E G-E - P F F Dual G G-E E E E G G P-F G G-E Eptam E E G E E G-E - G-E G E Prefar G G G G G-E F-G - P P P Pursuit F P F F F P-F P F-G G E Sencor G F-G G G-E G-E F-G - P P P Treflan E G G-E E E G - P P P PREEMERGENCE
Alanap P P F F P P - P P P Atrazine F P F-G F F P P P P P Caparol F-G F-G F-G G F-G F - P P P Command E E E E E E - P P P Curbit E G-E E E E G-E G P P P Dacthal F-G F-G F G G F - P P P Devrinol E E E E E G-E - P-F F F-G Dual E E E E E G-E G P-F F-G E Goal E P F F F P - P F G Kerb G-E P G G-E G-E F-G - P P P Lorox F-G - G G G F-G - F F F Matrix P P P P P P P P P P Prowl E E E E E G-E E P P P Pursuit F P F F F P-F P G G-E E Sencor F F G G G-E P P P P P POSTEMERGENCE
Aim P P P P P P P P P P Atrazine F-G F F F F F F P P P Basagran P P P P P P P P-F F-G G-E *Diquat E-G G E G-E G-E G G F-G F-G G Enquik P-F P-F P-F P-F P-F P-F - F F F Fusilade E E E E E E E P P P *Gramoxone E E E E E E E F-G F-G G Lorox G F-G G G G G G F F F-G Matrix P P P P P P P P P - Poast E G-E E E G E E N N N Pursuit F P P-F PR F P-F P G-E G-E G-E Select E G-E G-E G-E E E E N N N Sempra/ Sandea
P
P P P P P P E E E Sencor
F P
P-F
F F-G
P P P P P E = 90-100% N = no control G = 80-90% = no data F = 60-80% P = below 60% * Initial burndown with sedges and other perennial weed can be complete but regrowth occurs.
Footnotes
1. This document is HS706, one of a series of the Horticultural Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Last revision date: June 2005. Please visit the EDIS Web site at http://edis.ifas.ufl.edu.2. William M. Stall, professor, Horticultural Sciences Department; James P. Gilreath, professor, Bradenton-Balm, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, 32611.
The use of trade names in this publication is solely for the purpose of providing specific information. It is not a guarantee or warranty of the products named, and does not signify that they are approved to the exclusion of others of suitable composition.
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. Larry Arrington, Dean.
Copyright Information
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