Herbicide Testing in Strawberry - Washington State University...Newly-planted Strawberry Trials • ‘Honeoye’ strawberries were transplanted in early June, 2015 and mid-May, 2016

Herbicide Testing in Strawberry

Tim MillerWSU Mount Vernon, NWREC

Strawberry Herbicide Trials • Two trials each in 2014, 2015, and

2016 were funded by the Washington Strawberry Commission

• Established strawberry herbicide trial

• Newly-planted strawberry herbicide trial

Weeds Present• Ladysthumb• Common chickweed• Shepherd’s-purse• Henbit

More Weeds• Common Lambsquarters• Common Groundsel• Pineapple-weed• Annual Sowthistle

Established Strawberry Trials2014-2016

Established Strawberry Trial• ‘Totem’ strawberry transplanted in May, 2013,

2014, and 2015– Treated with Spartan + Chateau shortly after

transplanting, and with Poast, Fusilade, or Select for grass control in June-May

– Roto-tilled several times during establishment, and once more prior to dormancy

• Herbicide combinations were applied in February, 2015 and January, 2016

• Tested herbicides included:– Registered: Chateau, Devrinol, Sinbar, and Spartan– Nonregistered: Alion, Dual Magnum, Fierce, Trellis,

Reflex, and Treevix

• Crop injury and weed controlmonitored prior to berry harvest

• Berries harvested in May and June of each year (three to four pickings per plot)– Total berry weight recorded and 50-

berry average fruit weight calculated

Established Strawberry Trial

Strawberry InjuryMarch, 2015%

Alion Fierce Treevix Trellis

Chart1

AlionAlionAlionAlionAlion

FierceFierceFierceFierceFierce

TreevixTreevixTreevixTreevixTreevix

TrellisTrellisTrellisTrellisTrellis

Alone

Chateau

Devrinol

Sinbar

Spartan

12

15

18

12

15

43

30

32

12

25

17

18

17

10

17

7

8

15

Sheet1

Column1AloneChateauDevrinolSinbarSpartan

Alion1215181215

Fierce433032

Treevix1225171817

Trellis10177815

Weed ControlMay, 2015-2016%

Alion Fierce Treevix Trellis

Chart1





Alone

Chateau

Devrinol

Sinbar

Spartan

85

85

88

91

84

90

91

87

90

80

82

83

85

84

71

52

61

62

62

Sheet1


Alion8585889184

Fierce90918790

Treevix8082838584

Trellis7152616262

Berry Yield2014-2016g/plot

Alion Fierce Treevix Trellis None

Chart1





NoneNoneNoneNoneNone

Alone

Chateau

Devrinol

Sinbar

Spartan

2627

2461

2556

2242

2460

2499

2055

2158

2257

2356

2342

2667

2786

2634

2642

2433

2949

2642

2434

Sheet1


Alion26272461255622422460

Fierce249920552158

Treevix22572356234226672786

Trellis26342642243329492642

None2434

ConclusionsEstablished Strawberry Trials

• Strawberry injury in March, 2015 was high with Fierce and Treevix + Chateau

• Depending on the year, weed control was fair to excellent through harvest with most combinations

• Berry size and yield were fairly similar among treatments (2015 was a bad year…)– Generally greater with Treevix or Trellis with

Spartan or Sinbar– Generally lower with Fierce combinations, Alion +

Sinbar, Treevix alone or with Chateau or Devrinol

Newly-planted Strawberry Trials2015-2016

Newly-planted Strawberry Trials

• ‘Honeoye’ strawberries were transplanted in early June, 2015 and mid-May, 2016

• Herbicides applied shortly after transplanting (POSTR)– Registered herbicides were combinations of

Spartan, Chateau, Devrinol, and Sinbar, – Nonregistered herbicides were Reflex, Trellis,

Fierce, Alion, and Dual Magnum

• Crop injury and weed controlmonitored through the season

• Three plants per plot were collected and their total leaf areawas measured in late August, 2015 and early September, 2016

Newly-planted Strawberry Trials

Weed ControlJuly, 2015-2016%

Alion Reflex Treevix Trellis

Chart1


ReflexReflexReflexReflexReflex



Alone

Chateau

Devrinol

Dual Mag

Spartan

72

77

79

71

69

75

74

53

47

67

62

79

74

76

74

Sheet1

Column1AloneChateauDevrinolDual MagSpartan

Alion72777971

Reflex697574

Treevix534767

Trellis6279747674

Strawberry Leaf AreaAugust-September, 2015-2016cm3

Alion Reflex Treevix Trellis None

Chart1


ReflexReflexReflexReflexReflex



NoneNoneNoneNoneNone

Alone

Chateau

Devrinol

Dual Mag

Spartan

858

821

951

538

645

935

727

685

705

507

744

1005

984

988

666

900

Sheet1

Column1AloneChateauDevrinolDual MagSpartan

Alion858821951538

Reflex645935727

Treevix685705507

Trellis7441005984988666

None900

ConclusionsNewly-planted Strawberry Trials

• Weed control was fair to good through the summer with several combinations, especially those with Alion and Trellis, as well as Reflex with Devrinol or Dual Magnum

• Strawberry leaf area was generally greater with Alion, Reflex, or Trellis with Devrinol, or with Trellis with Chateau or Dual Magnum

Many Thanks• Funding for all my berry trials was provided by:

– Washington Blueberry, Red Raspberry and Strawberry Commissions

– BC Raspberry Industry Development Council– Washington State Commission for Pesticide

Registration• Norcal Nursery for plant material• Cooperators and herbicide manufacturers• Carl Libbey, Yushan Duan, and the gang at

WSU Mount Vernon NWREC

Herbicide Testing in StrawberryStrawberry Herbicide Trials Weeds PresentMore WeedsSlide Number 5Established Strawberry TrialEstablished Strawberry TrialStrawberry Injury�March, 2015Weed Control�May, 2015-2016Berry Yield�2014-2016Conclusions�Established Strawberry TrialsSlide Number 12Newly-planted Strawberry TrialsNewly-planted Strawberry TrialsWeed Control�July, 2015-2016Strawberry Leaf Area�August-September, 2015-2016Conclusions�Newly-planted Strawberry TrialsMany ThanksSlide Number 19

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Herbicide Testing in Strawberry - Washington State University...Newly-planted Strawberry Trials • ‘Honeoye’ strawberries were transplanted in early June, 2015 and mid-May, 2016