No effective herbicides for nutsedge control in strawberry?

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Presentation transcript:

No effective herbicides for nutsedge control in strawberry? Oleg Daugovish, Anna Howell, UCCE-Ventura and Steve Fennimore, UC-Davis. Salinas

S-metolachlor (Dual Magnum) Acetamide herbicide: Root and shoot growth inhibition of germinating weeds Good nutsedge efficacy and safety in vegetable crops Added to IR-4 (minor crop) list in 2008 for strawberry: need data on nutsedge control in strawberry and crop safety

2009

Yellow and purple nutsedge at Santa Paula, CA in summer-planted strawberry Nutsedge tubers placed in pots into beds DM 0.95 lb a. i. /acre on June 9 Applied to beds and covered by mulch Strawberry transplanted 30 d later

Purple nutsedge Untreated control DM 0.95lb a. i./acre

Purple nutsedge counts No significant injury to strawberry

Yellow nutsedge counts injury was not determined : poor quality transplants

2010

March 19, 2010: yellow nutsedge re-emergence in untreated DM 0.95 Untreated

EFFECT ON STARWWBERY. Plant mortality number, Nov. 9: no signif EFFECT ON STARWWBERY? Plant mortality number, Nov. 9: no signif. differences

Plant injury 1(none) – 10 (dead), Nov. 9: no signif. differences

Plant size, Dec. 10:

Fruit yield (fresh market, Feb. –April 2010): P =0.05 13% less

2010-2011

Nov 22, 2010: DM 0.63 DM 0.95 Untreated

a ab b

Is there an effect of DM on this plant?

a a a Mortality: identical in all treatments ~1.5%

b b c 30% less a a a Unmarketable yield: similar trend

Dual Magnum Rates 0.63 and < likely safe on strawberry Effective for moderate nutsedge density ACKNOWLEDGEMENTS: CSC, UC HANSEN, CEDAR POINT NURSERY