herbicide testing in strawberry - washington state university...newly-planted strawberry trials •...
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Herbicide Testing in Strawberry
Tim MillerWSU Mount Vernon, NWREC
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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
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Weeds Present• Ladysthumb• Common chickweed• Shepherd’s-purse• Henbit
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More Weeds• Common Lambsquarters• Common Groundsel• Pineapple-weed• Annual Sowthistle
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Established Strawberry Trials2014-2016
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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
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• 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
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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
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Weed ControlMay, 2015-2016%
Alion Fierce Treevix Trellis
Chart1
AlionAlionAlionAlionAlion
FierceFierceFierceFierceFierce
TreevixTreevixTreevixTreevixTreevix
TrellisTrellisTrellisTrellisTrellis
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
Column1AloneChateauDevrinolSinbarSpartan
Alion8585889184
Fierce90918790
Treevix8082838584
Trellis7152616262
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Berry Yield2014-2016g/plot
Alion Fierce Treevix Trellis None
Chart1
AlionAlionAlionAlionAlion
FierceFierceFierceFierceFierce
TreevixTreevixTreevixTreevixTreevix
TrellisTrellisTrellisTrellisTrellis
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
Column1AloneChateauDevrinolSinbarSpartan
Alion26272461255622422460
Fierce249920552158
Treevix22572356234226672786
Trellis26342642243329492642
None2434
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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
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Newly-planted Strawberry Trials2015-2016
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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
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• 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
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Weed ControlJuly, 2015-2016%
Alion Reflex Treevix Trellis
Chart1
AlionAlionAlionAlionAlion
ReflexReflexReflexReflexReflex
TreevixTreevixTreevixTreevixTreevix
TrellisTrellisTrellisTrellisTrellis
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
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Strawberry Leaf AreaAugust-September, 2015-2016cm3
Alion Reflex Treevix Trellis None
Chart1
AlionAlionAlionAlionAlion
ReflexReflexReflexReflexReflex
TreevixTreevixTreevixTreevixTreevix
TrellisTrellisTrellisTrellisTrellis
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
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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
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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
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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