Walnut Weeds Have Changed; Have You Updated Your Weed ...cetulare.ucanr.edu/files/161805.pdf · • Horseweed (glyphosate) • Hairy fleabane (glyphosate and/or paraquat) • Rigid

Walnut Weeds Have Changed; Have You Updated Your Weed Control Methods?

Kurt HembreeFarm Advisors, UCCE, Fresno County

44th Tri-County Walnut DayFeb 6, 2013

Kurt Hembree, UCCE, Fresno County – Feb 6, 2013

• Horseweed (glyphosate)• Hairy fleabane (glyphosate and/or paraquat)• Rigid ryegrass (glyphosate)• Junglerice (glyphosate)

Known herbicide-resistant weeds:


Horseweed

Junglerice

Rigid ryegrass

Hairy fleabane

http://www.google.com/url?sa=i&rct=j&q=glyphosate+resistant+ryegrass+california&source=images&cd=&cad=rja&docid=E7f2UKK_Mdl3gM&tbnid=6E_dWD_8INgrMM:&ved=0CAUQjRw&url=http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4641&ei=sQoQUcfHFa2UjAL-1oCYAw&bvm=bv.41867550,d.cGE&psig=AFQjCNEJraAeJ9VMLTcCmHA-INJ6IUsD1A&ust=1360092198564910

Future herbicide-resistant weeds:• Palmer amaranth (glyphosate)• Lambsquarters (glyphosate)• Barnyardgrass (DNAs)• Sprangletop (DNAs)


Sprangletop

Barnyardgrass

Lambsquarters

Palmer amaranth

0

20

40

60

80

100

2000 2005 2010

Acr

es tr

eate

d (%

)Herbicide use in walnuts in CA

(by herbicide type)

Preemergent PostemergentSource: CA DPR


0

10

20

30

40

50

diuroneptcflum

ioxazinindaziflamisoxabennaprpam

idenorflurazonoryzalinoxyfluorfenpendim

ethalinpenoxsulamrim

sulfuronsim

azinethiazopyrtrifluralincarfentrazoneclethodimfluazifopglufosinateglyphosatem

sma

paraquatpyraflufensaflufenacilsethoxydim2,4-D

Acr

es tr

eate

d (%

)Herbicide use in walnuts in CA

(by active ingredient)

2000 2005 2010Source: CA DPR

PRE POST


0

5

10

15

20

25

30

35

40

9 14 10 22 3 4 5 7 2 1 21 8 17 29 12 15

Acr

es tr

eate

d (%

)

WSSA MOA group number

Herbicide use in walnuts in CA in 2010(by mode of action)

Source: CA DPR

80%


*Use tank-mixes of multiple soil residual MOAs as your program base, then go with burndowns

to pick-up any escapes.

Where to find information:•http://ucipm.ucdavis.edu

‐ IPM practices, herbicide treatment tables, scouting

•http://cefresno.ucdavis.edu

‐Weed/herbicide charts, weed topics, research, etc.

•http://www.weedscience.com

‐Weed resistance, herbicide MOA

•http://www.agrian.com

‐ Pesticide labels


http://ucipm.ucdavis.edu/

http://cefresno.ucanr.edu/

http://www.weedscience.com

http://www.weedscience.com


*Look for MOA on the container and/or the label.

Trade name MOA Rate/A Additives* Tree age PHIPreemergentAlion 29 5-6.5 fl oz --- 36 mo 14Chateau 14 6-12 oz --- 12 mo 60Matrix SG 2 4 oz --- 12 mo 14Pindar GT 2 + 14 1.5-3 pt --- 9 mo 60Prowl H2O 3 2-6 qt --- Anytime 60Trellis 21 0.66-1.33 lb --- Anytime 60

PostemergentRely 280 10 3.5-5 pt --- Anytime 14Shark EW 14 2 fl oz NIS/COC/MSO Anytime 3Venue 14 1-4 fl oz NIS/COC Anytime 0Treevix 14 1 oz MSO Anytime 7

*Add AMS at 8.5 lb/100 gal spray solution

Labeled products since 2005:


Some important weeds targeted by the newer preemergents:

Chateau Trellis Matrix SG Pindar GT AlionFilareeHairy fleabane (GR/PR)Horseweed (GR)KnotweedMalvaNettlePrickly lettucePuncturevineWillowherbRyegrass (GR)Junglerice (GR)


Rely 280 Shark Treevix Venue Roundup 2,4-DFilareeHairy fleabane (GR/PR)Horseweed (GR)KnotweedMalvaNettlePrickly lettucePuncturevineWillowherbRyegrass (GR)Junglerice (GR)


Some important weeds targeted by the newer postemergents:

How have these newer materials been performing?

Preemergent• flumioxazin (Chateau)• rimsulfuron (Matrix SG)• penoxsulam + oxyfluorfen (Pindar GT)• isoxaben (Trellis)• indaziflam (Alion)

Postemergent• glufosinate (Rely 280)• carfentrazone (Shark)• pyraflufen (Venue)• saflufenacil (Treevix)


Walnuts in Madera, CA120 DAT

Ansolabehere, Valent

Chateau 12 oz Untreated



http://www.google.com/url?sa=i&rct=j&q=Pindar+GT+Herbicide&source=images&cd=&cad=rja&docid=BRQu5A8WNG4RiM&tbnid=lsaRJFfgr6P-oM:&ved=0CAUQjRw&url=http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=8946&ei=5yEQUfC2GMzWigLn0YDYAg&bvm=bv.41867550,d.cGE&psig=AFQjCNGWls9IZ73mfko-1M1RjITfdu4POw&ust=1360098138736705


Hairy fleabane control in almonds in 2012

0 10 20 30 40 50 60 70 80 90 100

9.Chateau+Regiment .383+.0285

8.Chateau+V‐10206 .255+.210

7.Chateau+ProwlH2O .255+1.9

6.Matrix .0625

5.Pindar GT 1.52

4.Alion .065

3.Goal Tendar 1.5

2.Chateau .383

1.Rely 1.5

Fleabane 30DAT Fleabane 90DAT Fleabane 120DAT Fleabane 196 DAT

RATE: LB AI/A

PERCENT CONTROL

Appl: 12‐19‐11 Trt. 8 Chateau+V‐10206 applied 1‐4‐12; Rely @ 1.5 lb ai/A included with all treatments

Canevari, Emeritus


Almond seasonal control in 2012138 DAT

0 10 20 30 40 50 60 70 80 90 100

9.Chateau+Regiment .383+.0285

8.Chateau+V‐10206 .255+.210

7.Chateau+ProwlH2O .255+1.9

6.Matrix .0625

5.Pindar GT 1.52

4.Alion .065

3.Goal Tendar 1.5

2.Chateau .383

1.Rely 1.5

Overall Weed Control

RATE: LB AI/A

PERCENT CONTROL

Appl: 12‐19‐11 Trt. 8 Chateau+V‐10206 applied 1‐4‐12; Rely @ 1.5 lb ai/A included with all treatmentsCanevari, Emeritus

Pindar GT 3 pt + Prowl H2O 2 qt + Rely 280 3.5 pt

Alion 5 oz + Rely 280 3.5 pt Alion 5 oz + Matrix 4 oz + Rely 280 3.5 pt

Rely 280 3.5 pt

Almonds in Fresno, CA in 2010 and 2011115 DAT


UC ANR


http://www.google.com/url?sa=i&rct=j&q=Pindar+GT+Herbicide&source=images&cd=&cad=rja&docid=5lxrnFd_ZX--wM&tbnid=GUxUhsXvsd04-M:&ved=0CAUQjRw&url=http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6182&ei=kiEQUaOpNKzWiAKmlID4CA&bvm=bv.41867550,d.cGE&psig=AFQjCNEMmOlGjXtYu2PbtK7FeJP0gsn7XA&ust=1360098055766619


70

80

80

85

95

90

95

90

98

90

80

80

0 10 20 30 40 50 60 70 80 90 100% Weed Control

Matrix SG 4.0 oz

Matrix SG 4.0 oz + Alion 2.5 floz



Matrix SG 4.0 oz + Chateau 6.0 oz

Matrix SG 4.0 oz + Chateau 8.0 oz

Matrix SG 4.0 oz + Goal 2XL 6.0 pt

Matrix SG 4.0 oz + Surflan AS 4.0 qt

Matrix SG 4.0 oz + Prowl H2O 4.0 qt

Alion SC 5.0 floz

Chateau SW 12.0 oz

Pindar GT 3.0 pt

Treatment*

Italian Ryegrass in Almonds – 119 DAT Martinez Ranch – Durham, CA

* all treatments included Rely 280 at 5.0 ptPacheco, DuPont


Almonds in Durham, CA in 2012119 DAT

Pacheco, DuPont

Italian ryegrass, shepherd’s-purse, filaree, malva, chickweed,

California burclover,


Junglerice control – 180 DAT

Gersdorf, Bayer CropScience

Alion 5 oz


Hanson, UC Davis

Almonds in Delhi, CA in 2012120 DAT


Grapes in Fresno, CA in 2010110 DAT

Rely 280 3.5 pt

Matrix 4 oz + Surflan 2 qt + Rely 280 3.5 pt Chateau 12 oz + Surflan 2 qt +

Rely 280 3.5 pt

Rely 280 3.5 ptKurt Hembree, UCCE, Fresno County – Feb 6, 2013

Alion 5 oz + Simazine 1 qtNovember 11, 2011


60

70

80

90

100

Knotweed Pineapple Burclover Bluegrass

Trellis 1 lb Trellis 1 lb + SurflanTrellis 1.33 lb Trellis 1.33 lb + Surflan

Almonds in Fresno, CA in 2012186 DAT

Mueller, Dow AgroSciences


Almonds in Fresno, CA in 2012120 DAT

(Trellis at 1 lb/acre)

Mueller, Dow AgroSciences


Untreated Chateau 12 oz + Rely 280 Alion 5 oz + Rely 280

Non-crop area in Fresno, CA in 201090 DAT


Untreated Chateau 12 oz + Rely 280 Alion 5 oz + Rely 280

Non-crop area in Fresno, CA in 2010210 DAT


*If weed seeds have sprouted before Alionis applied, mix another material with it.

Alion 6.5 oz

Alion 5 oz

1 yearlater


0

1

2

3

4

5

6

7

8

9

10

gly par glu saf car pyr gly + pyr

gly + saf

gly + car

glu + pyr

glu + car

glu + saf

gly + glu

Con

trol r

atin

gPOST control across 6 trials in 2009

Hairy fleabane & Horseweed Grasses


Treevix 1 oz + MSOFresno County in 2012



0 20 40 60 80 100

Glufosinate + Isoxaben

Glufosinate + Flumioxazin + Bispyribac

Glufosinate + Flumioxazin + …

Glufosinate + Flumioxazin + …

Glufosinate + Rimsulfuron

Glufosinate + Pinoxsulam

Glufosinate + Indaziflam

Glufosinate + Oxyflurazon

Glufosinate + Flumioxazin

Saflufenacil

% Control

B

B

B

B

B

B

B

B

B

Almonds in Tulare County in 20127 DAT

Rios, UCCE


Treevix + MSO 14 DAT

Rios, UCCE


Weed Control in Pistachios – 2010UCCE – Richgrove (Wright)

21 DAT

Treatments Rate/ A Nozzles

AMAPAPalmer

Amaranth(2-10 inches)

AMAPAPalmer

Amaranth(11-30 inches)

AMABLProstratePigweed

MALNEMalva

URTDIBurningNettle

SSYIRLondonRocket

1. Rely 280 3.5 pt FF 8002 86 38 45 40 78 1002. Rely 280 3.5 pt FF 8004 86 45 55 43 75 1003. Rely 280 3.5 pt TJ 11002 86 51 45 30 78 934. Rely 280 3.5 pt TJ 11004 94 54 70 53 82 1005. Rely 280 5 pt FF 8002 84 48 65 50 98 1006. Rely 280 5 pt FF 8004 91 44 56 35 80 1007. Rely 280 5 pt TJ 11002 94 51 80 43 87 1008. Rely 280 5 pt TJ 11004 93 55 63 50 100 1009. Untreated - - 0 0 0 0 0 0

Untreated

Roundup PowerMax 1.5 pt

Treevix 1 oz +Roundup 1.5 pt +

MSO 1% v/v



PRE+POST Program

POST Program

PRE+POSTProgram

Hanson, UC Davis


TAKE-HOME POINTS• Take advantage of the newer preemergents to control

difficult weeds like fleabane, horseweed, junglerice, and ryegrass. They’re a bit costly (compared to simazine and diuron), but should help on the postemergent end.

• Rotate or tank-mix MOAs where possible to broaden and lengthen control.

• Use PREs as the base and POSTs to clean-up escapes when they’re small. Relying solely on POST treatments can be problematic and often leads to resistance.

• These newer products are not regulated under GWPA.


Documents

Walnut Weeds Have Changed; Have You Updated Your Weed ...cetulare.ucanr.edu/files/161805.pdf · • Horseweed (glyphosate) • Hairy fleabane (glyphosate and/or paraquat) • Rigid