International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT SPREADING DAYFLOWER
(Commelina diffusa)


Synthetic Auxins (O/4)

United States, Hawaii
INTRODUCTION SPREADING DAYFLOWER
Spreading Dayflower (Commelina diffusa) is a monocot weed in the Commelinaceae family.  In Hawaii this weed first evolved resistance to Group O/4 herbicides in 1957 and infests Sugarcane for sugar.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to 2,4-D and they may be cross-resistant to other Group O/4 herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameSpreading Dayflower
SpeciesCommelina diffusa
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationUnited States, Hawaii
Year1957
Situation(s)Sugarcane for sugar
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NOTES ABOUT THIS BIOTYPE

GENERAL

Hilton, H.W. 1957. Herbicide tolerant strains of weeds, Hawaiian Sugar Plant. Assoc. Annu. Rep., 69 (1957).

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GENERAL

One biotype of Commelina diffusa could withstand 5 times the dosage of a susceptible.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Spreading Dayflower biotype with this Spreading Dayflower biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on Group O/4 resistant Spreading Dayflower have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group O/4 resistant Spreading Dayflower from Hawaii please update the database.
 
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CONTRIBUTING WEED SCIENTISTS


ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Hawaii have been instrumental in providing you this information. 
Herbicide Resistant Spreading Dayflower Globally
(Commelina diffusa)
Herbicide Resistant Spreading Dayflower Globally
(Commelina diffusa)
Drag a column header and drop it here to group by that column
Herbicide Resistant Spreading Dayflower Globally
(Commelina diffusa)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Hawaii) United StatesHawaii1957 Sugarcane for sugar 2,4-D 45 Synthetic Auxins (O/4)
56Commelina diffusaSpreading Dayflower394
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, August 19, 2017 .  Available  www.weedscience.org
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