International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Datura stramonium)

Photosystem II inhibitors (C1/5)

United States, Indiana
Jimsonweed (Datura stramonium) is a dicot weed in the Solanaceae family.  In Indiana this weed first evolved resistance to Group C1/5 herbicides in 1992 and infests Corn (maize).   Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group C1/5 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Nov 29, 2000 )

Common NameJimsonweed
SpeciesDatura stramonium
GroupPhotosystem II inhibitors (C1/5)
LocationUnited States, Indiana
Situation(s)Corn (maize)
Contributors - (Alphabetically)Daniel Childs 
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Daniel Childs
Daviess county, Indiana.

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Daniel Childs
Resistance to atrazine occurred due to the continued use of this product in community of farmers.

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Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Jimsonweed biotype with this Jimsonweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group C1/5 resistant Jimsonweed 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

Studies on the mechanism of resistance of Group C1/5 resistant Jimsonweed from Indiana indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
Relative Fitness

Researchers have indicated that Group C1/5 resistant Jimsonweed is ecologically less fit than normal susceptible Jimsonweed.  Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production..  There may be a note below or an article discussing the fitness of this biotype in the Fact Sheets and Other Literature
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Now With Monsanto, Was With
Purdue University
Cooperative Extension
Dept of Botany& Plant Pathology
915 West State St, Lilly Hall of Life Sciences
West Lafayette, 47907, Indiana
United States
Email Daniel Childs


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Indiana have been instrumental in providing you this information. Particular thanks is given to Daniel Childs for providing detailed information.
Herbicide Resistant Jimsonweed Globally
(Datura stramonium)
Herbicide Resistant Jimsonweed Globally
(Datura stramonium)
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Herbicide Resistant Jimsonweed Globally
(Datura stramonium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Indiana) United StatesIndiana1992 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
75Datura stramoniumJimsonweed407
Literature about Similar Cases

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