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Weed Control in Strawberry with Herbicides
Steve Fennimore University of California-Davis, Salinas, CA
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Herbicides Herbicides allow you to control
weeds when and where needed better than any fumigant.
Herbicides allow you the freedom to use clear tarps.
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What we are trying to reduce – hand weeding
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The Role of Herbicides The soil residual activity of herbicides
compliments fumigants and allows you tocontrol weeds that fumigants miss.
0 10 20 30 40
Fumigants
GoalTender
Chateau
Weeks
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Herbicides vs. FumigantsFumigants do not control weeds in-
season, therefore if you only use fumigants you must kill all weed seed and propagules at fumigation.
Herbicides provide backup to a lessthan perfect weed kill at fumigation.
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Burclover Redstem filaree
Little mallow
Weeds difficult to control with fumigants
Sweetclover
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C206-01
Annual bluegrass (Poa annua) plant. J. M. DiTomaso
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Yellow nutsedge - perennial
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Fallow beds – time for application
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Clear plastic – weed control must be good
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Effect of mulch color on fruit yield –Irvine 1988
0200400600800
1000120014001600
Clear Black Brown White
Fruit
g/plant
Mulch color
Voth and Bringhurst 1990, average of 6 varieties
A B BC C
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Effect of mulch color on weed control – Watsonville 2001
0102030405060708090
Clear Black Brown White
Weed control (%)
Mulch color
Johnson and Fennimore 2005
C A A A
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Weed control dilemma Black plastic controls weeds better
than clear but reduces fruit yields. Clear film promotes earlier and
higher fruit yields.What can you do?
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Weed spectrumWeed Chateau Goal Metam Na Prowl
Bluegrass C P C CChickweed C N C CClover C P N NFilaree C C C NFleabane C P C NMalva C C N PYellow nutsg N N P NShepherd's C C C PSowthistle C C C N
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Herbicide selectivitySelectivity: the herbicide controls the
weed but is safe to the crop.Selectivity must be carefully verified
in an extremely valuable crop like strawberry.
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Trial locationsSpence USDA Farm, Salinas, CA.
Ran 10/24/07 to 9/30/08.Spence USDA Farm, Salinas, CA.
Ran 10/24/09 to 10/30/10.
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Herbicide variety trial 2007-08Objective to identify which varieties are
most and least sensitive to Chateau and GoalTender herbicides
Chateau applied at 2, 3 & 6 oz/AGoalTender 0.25 & 0.5 pt/AVarieties – Albion, Camarosa, Festival,
Ventana, Palomar, Plant Sciences, San Juan, Lanai
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Herbicide variety trial 2009-10Objective to identify which varieties are
most and least sensitive to Chateau and GoalTender herbicides
Chateau applied at 2, 3 & 6 oz/AGoalTender 0.25 & 0.5 pt/AVarieties – Albion, Camarosa, Palomar,
San Andreas, Ventana, 4634 PSI, 5298 PSI, San Juan, Del Rey
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Palomar Yields 2008
0
20
40
60
80
100
120
Control Cht 2 Cht 3 Cht 6 GT 0.25 GT 0.5
Relative yields (%)
*
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Lanai Relative Yields 2008
0
20
40
60
80
100
Control Cht 2 Cht 3 Cht 6 GT 0.25 GT 0.5
Relative yields (%)
* *
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San Andreas yields 2010
0100200300400500600700800
Control Cht 2 Cht 3 Cht 6 GT 0.25 GT 0.5
Frui
t yie
ld (G
/pla
nt)
*
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GoalTender fallow bed Label
Reentry interval 24 hours
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GoalTender Calif. 2(ee)
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Reentry interval 12 hours
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Herbicide variety: summaryTwo years data: Albion, Camarosa, Ventana,
PS 5298 and San Juan varieties did not suffer yield loss from either GoalTender or Chateau.
One years data: Del Rey, Festival, PS 4634 did not suffer yield loss from either GoalTender or Chateau.
San Andreas tolerated labeled rates of GoalTender and Chateau but be careful of overlap.
Lanai appears to be sensitive to both herbicides.
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Now registered on Strawberry
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Prowl H2OCan be applied pre-transplantCan be applied post-transplant but
not if new leaves are present Can apply to row middles if applied
at least 35 days before harvestCan apply no more than 3 pints/A per
application and no more than 6 pints/A per season.
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Prowl H2O: rates by soil texture
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Watsonville 2001-02Treat. Rate Timing Bluegrass Malva Fruit
/Transpt. No/40ft2 Trays/AProwl 2.1 pts PRE 7.3 bc 1.8 bc 4840 aProwl 2.1 pts POST 5.3 c 1.8 bc 3604 deControl 0 NA 15.0 a 5.3 abc 4708 ab
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Oxnard 2001-02Treat. Rate Timing Bluegrass Malva Fruit
/Transpt. No/40ft2 Trays/AProwl 2.1 pts PRE 5.3 b 18.8 abc 2017Devrinol 4 lbs PRE 6.5 b 17.8 abc 1947Control 0 NA 32.3 a 29.5 a 1986
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Prowl H20 2.1 pints/A at Salinas
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Prowl H2OA new tool for strawberry weed
managementHas a very flexible label Very effective on annual grassesVery safe to strawberry applied
pre-transplantReentry interval is 24 hours
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Sandea impregnated mulch in strawberry - Bayfilm
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AcknowledgementsUSDA ARS PW Area Wide MB
Alternatives ProgramCalifornia Strawberry Commission
Thanks to John Rachuy and Ben Weber