Weed Control in the Transition Zone

Weed Control in the Transition Zone

PLSC 441 Advanced Turfgrass Management January 25, 2017

slideshare.net

PRE vs POST Solutions to Problem Weeds Weed Control at Establishment Indicator Weeds

Review

THE LABEL IS…?

THE LAW

READ THE LABEL!

dallisgrass

Poa annua

goosegrass

crabgrass

bermudagrass

Chemical Control

Cultural Control

Weed Control

Remember the Basics

PRE vs.

POST

Pre-Emergence

Pre-Emergence

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Weed Seeds and Turf Roots

Weed Seeds and Turf Roots

Weed Seeds and Turf Roots

Weeds Best Controlled by PREs?

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What Else Can Affect PREs?

What Else Can Affect PREs?

Soil

Water

Temperature

5 cm 10 cm 15 cm UTC

5 cm 10 cm 15 cm UTC

All Images Taken 5 WAT

Mowing?

Smooth Crabgrass Control 5 MAT in Knoxville, TN

Smooth Crabgrass Control 5 MAT in Knoxville, TN

Questions on PREs?

Post-Emergence

Factors Affecting POST Control

Herbicide and Rate

AdjuvantsSpray Volume

Weed MaturityTiming

Environmental Conditions

Environmental Conditions

1 2

34

Weed Maturity

Timing

Herbicide and Rate

Spray Volume

Adjuvants

Troublesome Weeds in Tennessee

BermudagrassFusilade - 6 oz/ac Pylex - 1.5 oz/ac Turflon - 32 oz/ac

Sequential apps 3-4 weeks

Bermudagrass control in tall fescue

Dallisgrass

Trade Name Active Ingredient Turf Species

Roundup glyphosate NONE

MSMA monosodium methanearsonate Berm, Zoysia

Monument trifloxysulfuron Berm, Zoysia

Revolver foramsulfuron Berm, Zoysia

Tribute Total thiencarbazone + foram + halo Berm, Zoysia

Certainty sulfosulfuron B, Z, Cent., St.A

Katana flazasulfuron B, Z, Cent., St.A

Fusilade II fluazifop TF, Z

Dallisgrass control in tall fescue

Virginia Buttonweed

Sequential POST Applications

Escalade II

Momentum FX2

Celcius

Tribute Total

Blindside

Weed Control during establishment

Most PREs Are Not an Option

Herbicides During Establishment• Mesotrione (Tenacity)

• Topramezone (Pylex)

• Quinclorac (Drive)

• Carfentrazone (QuickSilver)

• Foramsulfuron (Revolver)

• Oxadiazon (Ronstar)

Prior to and at seeding

4 weeks or 2 mowings

NOT LABELED for fine fesuce or

creeping bentgrass

5 - 8 fl oz/acre

0.25% vol/vol NIS

Repeat Applications

Prior to and at seeding

28 days after seeding

Lawns Spot Treatment Only

1 - 1.5 fl oz/acre

0.5 - 1% vol/vol COC or MSO

Repeat Applications

NOT LABELED for creeping bentgrass

Excellentbermudagrasscontrol

Broadleaves/crabgrass/nimblewill

no spot spray

annual bluegrass

nutsedge

weak on bermuda and goosegrass

Tenacity

Pylex

bermudagrass

goosegrass

bentgrass tolerance

spot spray only

GreatCrabgrassControl

Prior to and at seeding

7 days after emergence

No fine fescue 0.9 - 2.1 fl oz/acre

0.25% vol/vol NIS14 days after emergence for Zoysiagrass

1 week prior to seeding

2 weeks after emergence

Warm-Season Only 4 - 35 fl oz/acre

Increased control with 1% MSO

3 weeks after emergence for Zoysiagrass

Sprigging bermudagrass

Off Target Movement

Immediately Prior

Immediately After

Dormant Warm-Season Only

80 fl oz/acre

Not for seed 4 month interval

Ronstar FloSprigging

Irrigate after application

Immediately Prior

Immediately After

4 - 8 packets/acre 4 - 8 lbs ai/acre

Irrigate after application

Ronstar 50 WSPSprigging

Dormant Warm-Season Only

Not for seed 4 month interval

Immediately Prior

Immediately After

100 - 150 lbs/acre

Not for seed 4 month interval

Ronstar GSprigging

Can use in established cool-

season

Irrigate after application

Why Ronstar and Not Other PREs?

Indicator Weeds

Compacted*Soil*

•  Moist,'clayey'soils'are'very'prone'to'compac2on.'

•  Water'infiltra2on'is'o6en'as'slow'as'1/10th'of'an'inch'per'hour.'

Compacted*Soil:*Crabgrass*Indicator*Weeds*

Digitaria'ischaemum''

Compacted*Soil:*Goosegrass*Indicator*Weeds*

Eleusine(indica((

Compacted*Soil:*Virginia*Bu5onweed*Indicator*Weeds*

Diodia&virginiana&&

Compacted*Soil:*Indicator*Weeds*

Prostrate*Knotweed* Common*Purslane*

Polygonum)aviculare) Portulaca)oleracea)

Low$Nitrogen$

Low$Nitrogen:$Indicator$Weeds$

White$Clover$

Black$Medic$

Trifolium)repens)

Medicago)lupulina)

Poorly&Drained&Soils&

Poor$Drainage:$Sedges,$Rushes$Indicator$Weeds$

Cyperus(esculentus(( Juncus(sp.((

Poor$Drainage:$Annual$Bluegrass!Indicator$Weeds$

Poa!annua!

Poor$Drainage:$Algae!Indicator$Weeds$

Photos$courtesy$of$North$Carolina$State$University$

Cyanobacteria!

Shade&

Shade&

Shade:'Moss'Indicator'Weeds'

Bryum&argenteum&and&others&

Shade:'Wild'Violet'Indicator'Weeds'

Shade:'Heal*all'Indicator'Weeds'

Prunella(vulgaris(

Picture'courtesy'of''Forrest'and'Kim'Starr'

Shade:'Nimblewill'Indicator'Weeds'

Muhlenbergia,schreberi,

Shade:'Japanese'S,ltgrass'Indicator'Weeds'

Microstegium,vimineum,

Acidic%Soil%

Acidic%Soil%

Acidic%Soil%

Acidic%Soil%pH:%Sheep%Sorrel%(pH%4)%Indicator%Weeds%

Rumex&acetosella&&

Indicator*Weeds*Acidic*Soil*pH:*Ground*Ivy*

Puccinia'glechoma.s'

Acidic%Soil%pH:%Common%Cinquefoil%Indicator%Weeds%

Poten&lla)sp.))

Photo%courtesy%of%North%Dakota%State%University:%hAp://www.ag.ndsu.edu/%

Basic&Soil&

Basic&Soil&pH:&Common&Plantain&Indicator&Weeds&

Plantago(major((

www.mobileweedmanual.com

Questions?