Weed Management in Soybeans

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Source: J.A. Ferrell, G.E. MacDonald, and B. J. Brecke, University of Florida

Successful weed control is one of the most important practices for economical soybean production in Florida. Losses due to weeds have been one of the major limiting factors in soybean production. Weeds compete with soybeans for light, moisture, and nutrients with early-season competition being the most critical. Most of the yield reduction due to weed competition occurs during the first six weeks after planting; therefore, major emphasis on control should be given during this period. However, producing a good crop of soybeans is only half the battle and will not be profitable unless the soybeans can be harvested. Late-season weeds can result in inefficient equipment operation and excessive harvest losses. Weeds can be controlled in soybeans; however, this requires good management practices in all phases of soybean production. Good soybean weed control involves utilizing all methods available and combining them in an integrated weed management system.

Crop Rotations
Crop rotations may be beneficial since many of the most troublesome weeds in soybeans (sicklepod, morningglories, cocklebur, and Florida beggarweed) can be more easily controlled in a crop such as corn. If the full benefit of the rotation is to be achieved, weeds must be controlled throughout the growing season of the rotational crop. Seed produced late in the season of the corn will be available to germinate and compete with the succeeding soybean crop. The major goal of the rotational crop for weed control is to reduce the number of weed seed available for germination the following season. Other benefits of crop rotation may include reduction in insects, diseases, and nematodes.

Crop Competition
Crop competition is one of the most important, but often one of the most overlooked tools in weed control. A good stand of soybeans, which emerge rapidly and shade the middles early, is helpful in reducing weed competition. This involves good management practices such as: choosing a well adapted variety, good fertility, maintaining proper soil pH, adequate plant populations, and using row spacings as narrow as practical. Utilizing these good management practices is necessary for producing good soybean yields and is also an aid in weed control.

The plant that emerges first and grows most rapidly is usually the plant that will have the competitive advantage; therefore, everything possible should be done to ensure that the soybeans, and not the weeds, have this competitive advantage.

Cultivation
Cultivation is still a good and economical method of weed control; however, for cultivation to be effective in controlling weeds in the row, the soybeans must be taller than the weeds. The major reason for cultivation is weed control; therefore, if good weed control has been achieved with a herbicide, delay cultivation until weeds are present. Cultivate only deep enough to achieve weed control, since deep cultivation may disturb soybean roots, bring weed seed to the surface, and disturb the layer of soil previously treated with a herbicide.

Know Your Weeds
Choose control methods that are effective for your specific weed problem. Generally, for preplant and preemergence applications, the weed problems must be anticipated since weeds may not have emerged at the time of application. This can best be done by observing the field in the fall and recording the weeds present and their location in the field. These "weed maps" can be very useful the next spring in refreshing your memory and making a decision on what herbicide to purchase. Before selecting your herbicides (Table 1, Table 2 and Table 3), identify your expected weed problems. Once your weed problems have been determined, Table 4 and Table 5 can be helpful in determining which herbicide is most effective for these weeds.

Herbicides
Herbicides are one of the most effective tools for weed control in soybeans (Table 1 and Table 2). Preplant or preemergence applications combined with the previously discussed management practices are important in ensuring that the soybeans have the initial competitive advantage. One of the problems often encountered during this period is lack of rain to activate surface applied herbicides. Surface applied herbicides require rainfall or irrigation to be effective and for best results, moisture is needed within a week after application. Lack of moisture during this period often results in poor weed control. Incorporated herbicides are not dependent on rainfall or irrigation and have generally given more consistent weed control; however, they do require additional time and equipment for incorporation. Surface-applied herbicides can give excellent control and offer the greatest ease of application but they also carry the risk of failure if moisture is not received.

If good initial weed control is received with either a preplant or preemergence herbicide and the soybeans are taller than the weeds, then other control measures are available to extend the control throughout the season. Over-the-top applications are successful in controlling late germinating weeds and weeds not controlled by preplant or preemergence herbicides. They can also be used to aid in harvest efficiency.

Table 4 and Table 5 can be helpful in choosing the herbicide that is best suited for your particular situation.

Calibrate
Calibrate accurately since rates too high may injure the crop and rates too low may not provide weed control. The herbicides listed in Tables 1 and Table 2 are those that have performed well in IFAS research at the rates and time of application suggested. Herbicides, like any other pesticide, should be handled with care. Store herbicides behind locked doors, in the original containers, with the label intact, and separated from seed, fertilizer, and other pesticides.

Prepack Mixes

During the past several years a great number of prepack mixes have become registered on soybeans and are legal for use within Florida. Currently individual active ingredients recommended in this publication can be purchased prepacked in a number of combinations. To list all prepack mixes currently available would be prohibitive in this format. It is important to evaluate the weed problem to be controlled and consult this fact sheet for individual or tank mix combinations which give good activity. Upon deciding the appropriate active ingredient needed, shop around to see if the active ingredient or active ingredient combination desired can be purchased in prepack form. At times the proper ratio desired may not be available but if suitable ratios do exist many times price advantages will be noted when purchasing prepack mixtures.

A list of prepack mixes and active ingredients contained that are registered for soybeans in Florida is shown in Table 2.

 

Herbicide-resistant Soybeans
Transgenic or herbicide-resistant soybeans are genetically altered to tolerate (the actual resistance is altered enzyme) herbicides that would normally kill or injure conventional or non-transgenic varieties. This genetic modification allows the use of broadspectrum herbicides over-the-top of soybeans and provides economical and efficient weed management.

The transgenic soybean varieties which are commercially available are Roundup Ready and Liberty Link. Using transgenic varieties can expand weed management options while providing a more convenient and effective method of weed control. The following section provides information regarding herbicide applications for Roundup Ready and Liberty Link varieties. This is not intended to substitute for herbicide labels, which should be carefully read prior to planting these varieties.

Roundup Ready Soybeans
Roundup Ready varieties are genetically altered to tolerate over-the-top applications of glyphosate, Roundup WeatherMax, Glyphomax Plus, Glyphomax, Touchdown and several other products containing glyphosate. However, be sure to check the product label for use on all Roundup Ready soybeans. Glyphosate controls most annual grasses and broadleaf weeds. The Roundup Ready system has been most successful where soybeans are drilled in 7- to 10-inch rows, where fields are scouted early, and when timely applications are made. Producers are encouraged to keep good records of planting to avoid spraying non-transgenic resistant fields with glyphosate. Drift to adjacent crops should be avoided. Sprayers should be cleaned thoroughly and flushed prior to and after application.

Application Timing.
Glyphosate can be applied anytime from the cracking stage throughout flowering. Multiple applications can be made, but should not exceed the recommended limit on the label. Application rates are dependent on weed species and size, therefore, consult label for this information. Timely application is required. The first application should usually be made 16 to 20 days after planting; repeat applications can be made if needed. In narrow-row soybeans under good growing conditions, a single application is often sufficient. Wide-row soybeans normally require either a preemergence herbicide followed by glyphosate or two postemergence applications.

Herbicide program.
Any registered soil-applied herbicide can be used on Roundup Ready soybeans. Soil-applied herbicides are generally not needed with timely postemergence applications except for fields with Florida pusley. Use of soil-applied herbicides will, however, make the timing of postemergence herbicides less critical and usually eliminate the need for a second application. Consult the manufacturer label for use rates.

The addition of Cobra or Ultra Blazer will aid in morningglory control. For additional information on the weeds controlled by other herbicides, see Tables 4 and 5.
Table 1. 

Weed Management in No-Till Soybeans.

Trade Name and

Broadcast Rate/Acre of Commercial Product

Common Name and Broadcast Rate/Acre of Active Ingredient

 

 

Remarks

BURNDOWN NO-TILL SOYBEANS

Gramoxone Inteon

1 - 2 qt

paraquat

For control of most annual weeds and top-kill of perennials. Apply before, during or after planting but prior to emergence of soybeans for control of emerged vegetation. Good coverage is essential for effective control. Apply at 40 to 60 gal/A. Add a surfactant as recommended on the label.

Various

glyphosate

(1.0 - 4 lb)

Apply 1 qt/A to control annual weeds less than 6" tall. Apply in 10-20 gallons of water per acre.

Table 2. 

Soil-applied package mixes for Soybeans.

Trade Name and

Broadcast Rate/Acre of

Commercial Product

Common Name and

Broadcast Rate/Acre

of Active ingredient

 

 

Remarks

Canopy

(4 - 5 oz)

metribuzin (0.19 lb) + chlorimuron (0.028 lb)

Provides good to excellent control of broadleaf weeds. May be applied preplant incorporated on preemergence. Rotational restrictions apply. Consult label for crop rotational guidelines.

Boundary

(1.0 - 1.75 pt)

metolachlor (0.79 - 1.38) + metribuzin (0.19 - 0.22)

For broadspectrum control of grass and broadleaf weeds. Apply as a preplant incorporated or preemergence treatment. Soil moisture is required to activate. Some soybean varieties are highly sensitive to Boundary; consult your label of varietal information and restrictions. Soybeans should be planted 1.5 inches deep. Applications to sandy soils with low organic matter will increase soybean injury.

Herbicide recommendations in this report are contingent upon their registration by the Environmental Protection Agency. If a registration is canceled, the herbicide would no longer be recommended.

Table 3. 

Weed Management in Soybeans.

Trade Name and

Broadcast Rate/Acre of Commercial Product

Common Name and Broadcast Rate/Acre

of Active Ingredient

Remarks

PREPLANT

Treflan

1 - 2 pt

or

Prowl/Pendimax 3.3

1.2 - 1.8 pt

or

Prowl H2O

2 - 3 pt

or

Sonalan HFD

1.5 - 2.0 pt

trifluralin

 

pendimethalin

 

ethafluralin

Good control of annual grasses and certain broadleaf weeds. Poor control of cocklebur, sicklepod (coffeeweed), morningglory, and ragweed. Does not control nutsedge spp. Incorporate thoroughly according to label directions. The spectrum of weeds controlled is similar for each of these herbicides.

Pursuit

1.44 oz

imazethapyr

Annual grasses, nutsedge, some broadleaf weeds are controlled. Poor control of beggarweed, sicklepod, and ragweed. Excellent on purple nutsedge and wild poinsettia, good on yellow nutsedge. Pursuit may be applied PPI, PRE, early-post or post-emergence; however, best nutsedge control is generally provided with PPI or early-post treatments. Rotation restrictions: wheat - 4 months; corn - 8 months; tobacco - 9 months; cotton 18 months. No restriction for peanuts.

Scepter 70 DG

2.1 - 2.8 oz

imazaquin

For maximum grass control mix with Treflan, Prowl, or Dual. Scepter controls cocklebur, jimsonweed, smallflower and pitted morning-glory, pigweeds, wild poinsettia, prickly sida and smartweed. Sequential applications of Scepter will be required to control sicklepod and Florida beggarweed. Sequential post-emergence applications should be applied before these species exceed the 1 to 2 true-leaf stage. The total amount of Scepter applied per season should not exceed 1 1/3 pt. Rotation restrictions: wheat - 3 months; corn, tobacco - 9.5 months; peanuts - 11 months; cotton - 18 months.

PREEMERGENCE

Dual II Magnum

or

Dual Magnum

or

Cinch

 

1 - 1.3 pt

S-metolachlor

Controls annual grasses and certain broadleaf weeds. Poor control of cocklebur, sicklepod (coffeeweed), morningglory, and Texas panicum. Apply band or broadcast soon after planting. Use lower rates on coarse soils. Best results when rainfall is received within 4-6 days after application.

Sencor 4L

8 - 12 oz

 

Sencor 70DF

0.3 - 0.5 lb

metribuzin2

Good control of many broadleaf weeds, especially sicklepod and hophornbeam copperleaf. The range of crop tolerance is narrow; therefore, accurate application is critical. Refer to the Sencor label for soil texture and organic matter restrictions. Sandy soils with low organic matter are much more likely to result in Sencor injury. See footnote 2.

Outlook

10 - 18 oz

dimethenamid Similar to metolachlor. Application rate depends on soil properties. Check label for specific rates.

Valor

2 - 3 oz

flumioxazin

Provides good to excellent control of many annual broadleaf weeds. Valor will not control grass weeds, nutsedges, cocklebur, and sicklepod. Apply as a preemergence treatment only. Do not apply to emerged soybeans. Should be tank-mixed with Command or Prowl/Pendimax. Do not use Valor in the same field with Axiom, Domain, Dual, or Outlook or severe injury can occur. Valor can also be tank-mixed with glyphosate in reduced tillage production systems. Refer to label for specific rotation restrictions.

Lorox 4L

0.6 - 1.6 pt

linuron

Provides good control of Florida beggarweed, common ragweed, and pigweed. Adjust rates dependent upon soil type. Sicklepod will not be controlled. Linuron may be tank-mixed with Dual, or Prowl. Plant soybeans at least 1.5 inches deep to reduce injury.

Canopy1

4 - 5 oz

metribuzin

+

chlorimuron

Good control of several broadleaf weeds which include cocklebur, Florida beggarweed, jimsonweed, several morningglories, prickly sida and ragweed. May give partial control of nutsedges and seedling grasses. Crop tolerance is narrow, therefore accurate application is critical. Refer to the Canopy label for soil texture, pH and organic matter restrictions. Note recropping intervals and rotational guidelines on label. See footnote 2.

POSTEMERGENCE HERBICIDES FOR BROADLEAF WEEDS

Basagran, Depend, Ledger

1.0 - 2.0 pt

bentazon

Good to excellent control of certain weeds in the 2-6 leaf stage such as cocklebur, ragweed, morningglory, and yellow nutsedge. Use low rate on small weeds. Two applications at the low rate may be needed for yellow nutsedge control. Early treatment and good spray coverage are needed for best results. Soybeans have excellent tolerance. Always apply a crop oil concentrate (0.125-0.75% v/v).

Ultra Blazer

0.5 - 1.5 pt

acifluorfen

Good to excellent control of many broadleaf weed species. Refer to the label for proper rate for each species. Apply over-the-top after beans reach the first trifoliate stage and before the weeds are 4" tall. Sprayed leaves may be crinkled or cupped but new leaves should be unaffected. Add a surfactant at the rate recommended on the label. Do not apply if plants are drought stressed. May be tank mixed with several herbicides. Consult product labels for specifics.

Classic

0.5 - 0.75 oz

chlorimuron ethyl

Apply Classic as a postemergence treatment anytime after the first trifoliate has opened, but no later than 60 days before maturity. Weeds 2-4" in size that are actively growing. Treat weeds controlled include bristly starbur, cocklebur, Florida beggarweed, jimsonweed, pigweed, ragweed, smartweed and yellow nutsedge. A second application of Classic at ½ oz/A may be made 2-3 weeks after the initial application if conditions warrant. Postemergence applications of Classic should include a nonionic surfactant (80% active) at 1 qt per 100 gal of spray mixture. Strict recropping intervals apply. Check label for application specifics and recropping schedules.

Cobra 2EC

10 - 12.5 oz

lactofen

Good to excellent control of many broadleaf weed species. Refer to label for the proper rate for each species. Apply over-the-top when soybeans are at the 1st or 2nd trifoliate leaf stage and weeds are 3-4" tall. Sprayed leaves may show some cupping at the tip and crinkled edges, but will soon outgrow this damage under good conditions. Always apply a nonionic surfactant (0.25% v/v) or a crop oil concentrate (0.125-0.75% v/v) with Cobra herbicide. Cobra will exhibit more crop injury than Ultra Blazer.

Firstrate

cloransulam-methyl

May be applied any time prior to 50% flowering stage. Temporary yellowing of soybeans may occur in applications made prior to full emergence of the first trifoliate leaf. See label for tank mixes. Add a crop oil concentrate at 1.2% v/v. Provides good control of cocklebur and sicklepod. Rotation restrictions: 9 months (corn, cotton, peanut, sorghum), 18 months (sweet corn), 30 months (tobacco).

Pursuit 70 DG

1.44 oz

imazethapyr

Pursuit may be applied anytime after soybean

emergence but before weeds exceed 3 inches. Add 0.25% of a nonionic surfactant (2 pts/100 gals. of spray mixture). After application wait at least 10 days before cultivation. Do not apply Pursuit if Canopy, Scepter or Pursuit was used as a preplant incorporated or preemergence treatment.

Resource

4 oz

flumiclorac

Tank-mix with glyphosate for improved control of tall, ivyleaf, and entireleaf morningglory in Roundup Ready soybeans only. Must be applied with a NIS (0.25% v/v) or COC (1 pt/A).

Scepter 70 DG

1.4 - 2.8 oz

imazaquin

Apply Scepter as a postemergence treatment after crop emergence but before weeds exceed a height of 12". Apply when weeds are actively growing. The addition of 1 qt of non-ionic surfactant (80% active) per 100 gal of spray mixture is required. Weeds controlled include cocklebur, pigweeds and wild poinsettia. If postemergence treatment is in a sequential application scheme for the control of sicklepod or Florida beggarweed, spray should be made before these species exceed the 1-2 true leaf stage.

Storm

1.5 pts

bentazon

 

+

acifluorfen

Apply to actively growing weeds while soybeans are in the 2-3 trifoliate stage. A non-ionic surfactant (1-2 pt/100 gal) or crop-oil concentrate must be added. May be tank-mixed; consult label.

POSTEMERGENCE GRASS HERBICIDES

Assure II

quizalofop

Apply for control of annual and perennial grasses. Apply 5 ozs. when johnsongrass is 10-24" tall and re-treat with 5 ozs. when grass regrowth reaches 6-10" tall. Add crop oil concentrate at 1 gal or non-ionic surfactant at 1 qt/100 gals. of spray mixture. Use 8-10 ozs. for control of bermudagrass, Texas panicum, and broadleaf signalgrass.

Fusilade DX

6 - 12 oz

fluazifop-butyl

Apply for control of most annual and perennial grasses before they exceed 4" in height. See label for specific rates and weeds. Add crop oil concentrate (1 gal) or nonionic surfactant (2 pts) per 100 gal spray mixture.

Poast

1.0 - 1.5 pt)

or

Poast Plus

(1.5 - 2.25 pt)

sethoxydim

Apply for control of most annual and perennial grasses, before grasses exceed 4" tall. Include a crop oil concentrate at 2 pt/A. Poast is less effective than on bermudagrass.

Select, Arrow, Trigger

6 - 16 oz

 

Select Max

9 - 32 oz

clethodim

Apply for the control of annual and perennial grasses. For annual grasses up to 6" tall apply the lower use rates. A second application may be made. Higher rates will be necessary for rhizome johnsongrass, bermudagrass, and other perennial grasses. Add crop oil concentrate at 1 gal per 100 gals. of spray mixture. Select Max can be sprayed with either surfactant or crop oil. Do not apply more than 32 oz of Select or 64 oz of Select Max per acre per year.

Transgenic Soybeans

Liberty

28 - 34 oz

glufosinate Apply only to soybeans designated as Liberty Link. Can be applied from emergence until blooming. Do not apply more than 62 oz/A/yr. Very effective on morningglory, Florida pusley, cutleaf eveningprimrose. Less effective on grasses and sedges.

Credit

Glyfos

Glyphomax

Gly-Flo

Glypro

Roundup Ultramax

Roundup Weathermax

Touchdown

(and others)

glyphosate

(various trade names)

4 lb/gal (1.5 - 4.0 pts)

5 lb/gal (1.2 - 3.2 pts)

5.5 lb/gal (17 - 44 ozs)

glyphosate

(0.75-2.0 lb)

(0.75-2.0 lb)

(0.73-1.90 lb)

Apply glyphosate over-the-top of improved soybean varieties that are designated as soybeans with the Roundup Ready™ gene. Severe injury or death of soybeans will result if any soybean varieties not designated as having the Roundup Ready™ gene are sprayed with glyphosate. Controls a wide range of grass and broadleaf weeds. May be applied from the cracking stage through the full-flowering stage of soybeans. Use the low rate on weeds up to 3 inches tall. Higher rates are needed as weeds increase in size. For morningglories, applications should be made when morningglories are less than 3 inches tall. Sequential treatments may be applied provided that the maximum postemergence (from cracking to flowering) total use rate does not exceed 3.0 quarts per acre of 4 lb/gal products or 2.4 qts/A of 5 lb/gal products, or 2 quarts of 5.5 lb/gal products. No additional surfactant is necessary. There are no crop rotational restrictions for glyphosate. Not all formulations are labeled for use on RR soybeans. Refer to specific product label.

HARVEST AID

Various

2,4-DB

(0.25 lb)

May be applied as an overall spray 7-10 days before bloom to mid-bloom for severe cocklebur infestations. Temporary injury may occur. The late season spray is a SALVAGE TREATMENT for use if cocklebur forms a canopy over the crop.

Gramoxone Inteon

16 fl oz

paraquat

This is a harvest-aid treatment. Apply when half of the soybean leaves have dropped and the remaining half are yellow. Earlier applications will reduce yields. Harvest can begin 6-10 days after application. Weeds such as hairy indigo will not be desiccated by this treatment. Use as surfactant.

1 WARNING: THE FOLLOWING STATEMENT HAS BEEN ADDED TO THE SENCOR/CANOPY LABEL. THIS STATEMENT SHOULD BE HEEDED BY ALL PROSPECTIVE USERS AND STEPS SHOULD BE TAKEN TO COMPLY WITH THIS LABEL CHANGE. SENCOR/LEXONE IS A CHEMICAL WHICH CAN TRAVEL (SEEP OR LEACH) THROUGH SOIL AND CAN CONTAMINATE GROUND WATER AS A RESULT OF AGRICULTURAL USE. SENCOR/LEXONE HAS BEEN FOUND IN GROUND WATER AS A RESULT OF AGRICULTURAL USE. USERS ARE ADVISED NOT TO APPLY SENCOR/LEXONE WHERE THE WATER TABLE (GROUND WATER) IS CLOSE TO THE SURFACE AND WHERE THE SOILS ARE VERY PERMEABLE, I.E., WELL-DRAINED SOILS SUCH AS LOAMY SANDS. YOUR LOCAL AGRICULTURAL AGENCIES CAN PROVIDE FURTHER INFORMATION ON THE TYPE OF SOIL IN YOUR AREA AND THE LOCATION OF GROUND WATER. IN ADDITION, SOME PRODUCT LABEL STATEMENTS INCLUDE AS A FURTHER QUALIFICATION OF RISKY SOILS, SOILS CONTAINING SINKHOLES OVER LIMESTONE BEDROCK, SEVERELY FRACTURED SURFACES, AND SUBSTRATES WHICH WOULD ALLOW DIRECT INTRODUCTION INTO AN AQUIFER.

2 Metribuzin is not recommended for use on AP 55, AP 71, Burlison, Dassel, Tracy, Semmes, Altona, Vansoy, Coker 102 or Coker 156 soybeans: See product label for complete list soybean cultivars. Crop injury may occur when metribuzin is used in conjunction with soil-applied organophosphate pesticides, such as Counter, Dasanit, etc.

Table 4. 

Estimated Effectiveness of Recommended Herbicides on Common Weeds in Florida 1

Herbicides

Treflan, Prowl,

Sonalan

Scepter

Pursuit

Prowl

Canopy

Dual Magnum

First Rate

Scepter

Time of Application

PPI

PPI

PPI

PRE

PRE

PRE

PPI/PRE

POT

WEEDS

BROADLEAF

Bristly starbur

P

F

F

P

G

P

E

--

Crotalaria

P

F

F

P

--

P

--

--

Cocklebur

P

E

G-E

P

E

P

E

E

Florida beggarweed

P

F

P

P

E

F

F-G

F

Florida pusley

E

E

E

E

E

G-E

E

P

Morningglory

P

G

F-G

P

G

P

G

G-F2

Pigweed

E

E

G

G

E

E

P

E

Ragweed

P

F-G

P

P

E

F

E

--

Sicklepod (coffeeweed)

P

F

P

P

E

P

F

G3

Smartweed

P

G

P-F

P

G

P

--

--

Wild Poinsettia

P

G

G-E

P

F-G

P-F

G

E

GRASS

Junglerice/

Barnyardgrass

E

F

F

G

--

E

P

P

Crabgrass

E

F

F

G

G

E

P

P

Fall panicum

G-E

F

F

G

F

G

P

P

Goosegrass

E

F

F

G

G

E

P

P

Johnsongrass (seed)

E

F

F

G

F

F

P

P

Sandbur

E

F

F

G

F

G

P

P

Johnsongrass (rhizome)

P

P

P

P

P

P

P

P

Texas panicum

E

P

P-F

G-E

F

P

P

P

SEDGES

Purple Nutsedge

P

F

G-E

P

P

F

P

P-F

Yellow Nutsedge

P

F

G

P

P

F

P

P-F

1 Estimated effectiveness based on herbicide rates recommended in this report. Effectiveness may vary depending on factors such as herbicide rate, size of weeds, time of application, soil type, and weather conditions.

2 Check label for particular species control differences.

3 Must follow a sequential PPI Scepter treatment.

Weed Control Symbols: E = 90-100% control; G = 80-90% control; F = 60-80% control; P = less than 60% control; -- = insufficient observations.

Time of Application: PPI = preplant; PRE = preemergence; POT = postemergence over the top; PDS = postemergence directed.

Table 5. 

Estimated effectiveness of recommended herbicides on common weeds in Florida Soybeans (cont.)1

Herbicides

glyphosate*

Basagran

Classic

Gramoxone Inteon

Ultra Blazer,

Cobra

Poast Plus, Fusilade, Select, or Assure II

Time of Application

POT

POT

POT

PDS

POT

POT

WEEDS

BROADLEAF

Bristly starbur

G-E

E

E

G-E

P-F

P

Crotalaria

F-G

P

--

G-E

E

P

Cocklebur

E

E

E

E

E

P

Florida beggarweed

G

P

G

G-E

P-F

P

Florida pusley

P

P

P

P

P

P

Morningglory

F-G

F-G

G2

G

E

P

Pigweed

G-E

G

E

G-E

E

P

Ragweed

G

F-G

E

G-E

E

P

Sicklepod (coffeeweed)

G-E

P

G

G-E

P

P

Smartweed

G

--

E

F

F

P

Wild Poinsettia

G-E

P

G

F

F-G

P

GRASS

Junglerice/

Barnyardgrass

G

P

P

E

P

G-E

Crabgrass

E

P

P

E

P

E

Fall panicum

E

P

P

E

P

G-E

Goosegrass

E

P

P

E

P

G-E

Johnsongrass (seed)

E

P

P

E

P

G-E

Sandbur

G

P

P

E

P

G-E

Johnsongrass (rhizome)

E

P

P

P

P

G

Texas panicum

E

P

P

E

P

G-E

SEDGES

Purple Nutsedge

F-G

P

F

F

P

P

Yellow Nutsedge

F-G

G

F

F

P

P

1 Estimated effectiveness based on herbicide rates recommended in this report. Effectiveness may vary depending on factors such as herbicide rate, size of weeds, time of application, soil type, and weather conditions.

 

2 Check label for particular species control differences.

 

*glyphosate can be used ONLY on Roundup Ready Soybeans.

 

Weed Control Symbols: E = 90-100% control; G = 80-90% control; F = 60-80% control; P = less than 60% control; -- = insufficient observations.

 

Time of Application: PPI = preplant; PRE = preemergence; POT = postemergence over the top; PDS = postemergence directed.


Footnotes
1. This document is SS-AGR-05, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Revised November 2007 by J.A. Ferrell. Reviewed December 2009. Please visit the EDIS Website at http://edis.ifas.ufl.edu.

2. J.A. Ferrell, assistant professor, Agronomy Department; G.E. MacDonald, associate professor, Agronomy Department; B. J. Brecke, professor, West Florida Research and Education Center--Milton, 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 does not signify our approval to the exclusion of other products of suitable composition.

Use herbicides safely. Read and follow directions on the manufacturer's label.


Buyers Guide

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