Product update weed and brush control.C. K. Rice, Extension Agronomist

Read and follow all Label recommendations before using pesticides.

Lots of the same old products!

• 2,4-D amine• 2,4-D ester• Weedmaster• Grazon P+D• and generics

• Remedy• Reclaim• Tordon• Velpar• Spike• Banvel• and generics

There are many other products that are mixtures of these in some form or fashion.

Pasture Broadleaf Weeds.

2,4-D amine2,4-D LV Ester2,4-D + Dicamba2,4-D + PicloramCimarron Max

My Picks = the cheapest thing that will do the job.

Grass release is the goal!

The Old Standby.

• 2,4-D• Basis for most of the broadleaf pasture weed

control products.• If it’s gonna be cheap, and work against 90% of

the broadleaves out there, its gonna have 2,4-D in it.

• When annual broadleaves and western ragweed are small and actively growing, 2,4-D will do the job by itself.

Amine? LV? Ester?• Amine = salt = less

volatile = less active• LV = low volatile

ester = more active.• Be carefull with

esters around sensitive crops!

• 1.5 pints/ac – amine• 1.5 pints/ac –Lv4• 1 pint/ac – Lv6

Do Nothing Herbicide only

100#N + P + K 100#N + P + K and 2,4-D

Herbicide should only be used in pastures as a rescue treatment!

D+Fert Fert 2,4-D Nothing WDM yr10

1000

2000

3000

4000

5000

6000

Grass Broadleaf Legumes

Treatment

Yie

ld (l

bs/a

cre)

Weed control only pays dividends if it results in grass release.A lot of weeds = water loss, nutrient loss, and shading.

A few weeds will not affect grass yields!The grass release will not pay for the herbicide.

Treatments Applied April 26, 2006, Harvest was taken July 7, 2006

check herbicide N +P N+P + Herb.0

1000

2000

3000

4000

5000

6000

Bahia grass yields, Buffalo Valley Oklahoma

Column1

pH 5.6

N 3

P 15 (72%)

K 348

Advantages For Products Other Than 2,4-D

• Weeds too large• Weeds are stressed (drought)• Some hard to control species• Comparable cost

• Remember Good Timing Saves Money

Surfactant. Add 1 quart of surfactant per 100 gallons of mix if: Droughty conditions. Weeds are large. If weeds have a silver or gray cast – Hairy leaves and

stems: Lanceleaf ragweed, doveweed. If weeds have fine, fern like leaves: sneezeweed,

broomweed.

Check the label for the recommended surfactant for the herbicide you are using!

“NEW” Pasture Products I Get Questions About?

Cimarron Plus

• Metsulfuron Methyl 48% + Chlorsulfuron 15%• Ally + Glean• Weak on ragweeds, Does well on most of the annual

broadleaves.• I would only recommend it by itself for areas around

crops sensitive to phenoxy. Or for specific weed problems like buttercup, mullen, and bull thistle.

• This product can be hard on seedling grasses, and established grasses such as fescue and bahia grass.

Cimarron Extra

• Metsulfuron Methyl 30% + Chlorsulfuron 37%• Ally + Glean• Weak on ragweeds, Does well on most of the annual

broadleafs.• I would only recommend it by itself for areas around

crops sensitive to phenoxy. Or for specific weed problems like buttercup, mullen, broom snakeweed and bull thistle.

• This product can be hard on seedling grasses, and established grasses such as fescue and bahia grass.

Cimarron Max

• Metsulfuron Methyl .75% + Dicamba 12.25% + 2,4-D 35.25% (all by weight).

• Rate I : Excellent all around pasture weed control product.

• Rate II : Dewberry, Broom Snakeweed(fall), thistles, sericea lesp.

• This product can be hard on seedling grasses, and established grasses such as fescue and bahia grass.

Milestone

• Aminopyralid 40.6%• Close cousin of picloram, not as long of residual

and not restricted use.• Works well on seedling broadleaf weeds in

pastures, but is a little weaker with some of the perennials.

• My suggestion would be to use the Grazon Next, unless pasture is close to a sensitive crop.

GrazonNext

• Aminopyralid 6.58% + 2,4-D 51.6%• Not restricted use like P+D.• Works similar to P+D on most pasture weeds.• Seems to have better activity on solanum Sp.

than P+D.• Weaker on brush species and sericea than

P+D.• Shorter residual.

Pasturall• Aminopyralid 1.5% + 2,4-D 51.6%• Low rate of Aminopyralid, makes it cheaper

than Grazon next.• Not restricted use like P+D.• Marketed as having the kick of an ester with

out the volitility.• Should work on most annual pasture weeds.• Shorter residual.

Brush Herbicides!• Kill the easy stuff first! Broadcast

applications.• Hard to beat triclopyr (remedy)• Has activity on a large number of

our common brush species.• Brush control is a long term

endeavor.

• Work on the hard stuff as individual treatments or with more expensive specialty herbicides.

• Picloram (Tordon), hexazinon(velpar), Dicamba(Banvel) and tebuthiuron(spike)

Old standby brush herbicides.• Remedy• Velpar• Tordon• Spike

Most recommended broadcast application. 1 quart of remedy + 1 quart of Tordon.

Little cheaper and almost as good. 3 pints remedy + 1 pint of Tordon.

Most recommended soil applied.No liscense needed.Liquid:Velpar – honey locust, elm,

Blackberry, oaksPellets:Spike – sandy soils – oak and elm

Most recommended soil applied.Private applicators liscence

needed.Liquid:Tordon – honey locust, elm, BLK

berry, oaks, cedar

Surmount• Picloram 13.25% + Fluroxypyr 10.65%• Tordon + Starane• Good to excellent activity on many woody plant species.• Gives some of the better control I have seen on

persimmon with a broadcast application.• Research on prickly pear control indicates this is one of

the better solutions, although slow, 2-3years.• Gives good control of many of the pasture weed

problems, although more expensive than some other choices.

Pasturegard

• Triclopyr 25% + Fluroxypyr 8.6%• Remedy + Starane• Good to excellent activity on many woody

plant species.• Excellent on Sericea Lesp.• Gives good control of many of the pasture

weed problems, although more expensive than some other choices.

Grassy Weeds?

Is the cost of the cure worth the added value of the product?

Outrider or Maverick

• Sulfosulfuron • Johnsongrass, yellow and purple nutsedge

control in established bermuda and bahiagrass pastures.

• Also labeled for cheat and downey brome control on pastures west of the Miss. On many natives, bermuda and bahia.

Pastora• Now have a full label for Pastora herbicide. • Nicosulfuron 56.2% +Metsulfuron Methyl 15.0%• Accent + Ally• Rate: 1 to 1.5 ounces/ac; maximum of 2.5 onces per year • Timing: Bermuda is less than 4 inches in height following spring green

up and germinated sandburs are apparent. The label also suggest that applications can be made for sandbur control after the first cutting of hay.

• PHI: No grazing or haying restriction• Pastures and hay meadows (no rangeland) • Bermudagrass varieties: All, but must be an established stand• Being marketed for the control of Johnsongrass and field sandbur in

bermudagrass.• Also has activity on bahia, and on many summer and winter annual

weeds and grasses.

Prowl H2O

• Rate: 1.1 - 4.2 qts/ac; maximum of 4.2 qts per year • Timing: Anytime during winter dormancy and prior to weed germination • PHI: 60 days prior to harvest for hay; 45 days prior to grazing/harvest for

forage • Pastures and hay meadows (no rangeland) • Bermudagrass varieties: All, but must be an established stand• Activation: 1" of precipitation ideal prior to weed germination • Pendimethalin 38.7%• Sandbur control in Bermuda grass.• Apply before sandburs are up.• Should also control most germinating annual grasses.

Summary

• There is very little new chemistry out there in pasture and rangeland!!!!!

• Most of the “NEW” products are re-packaged products from other crops.