International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT EASTERN BLACK NIGHTSHADE
(Solanum ptycanthum)


ALS inhibitors (B/2)

United States, Illinois
INTRODUCTION EASTERN BLACK NIGHTSHADE
Eastern Black Nightshade (Solanum ptycanthum) is a dicot weed in the Solanaceae family.  In Illinois this weed first evolved resistance to Group B/2 herbicides in 1999 and infests Soybean.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to imazamox, and imazethapyr and they may be cross-resistant to other Group B/2 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 Jun 13, 2003 )

Common NameEastern Black Nightshade
SpeciesSolanum ptycanthum
GroupALS inhibitors (B/2)
Herbicidesimazamox, and imazethapyr
LocationUnited States, Illinois
Year1999
Situation(s)Soybean
Contributors - (Alphabetically)Dean Riechers, and F. William Simmons 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Eastern Black Nightshade biotype with this Eastern Black Nightshade 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 B/2 resistant Eastern Black Nightshade indicate that the inheritance is determined by a one gene, dominant, nuclear trait.  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 B/2 resistant Eastern Black Nightshade from Illinois 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

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 B/2 resistant Eastern Black Nightshade from Illinois please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

DEAN RIECHERS
Professor
University Of Illinois
Crop Sciences
N-331 Turner Hall 1102 S. Goodwin
Urbana, 61801, Illinois
United States
Email Dean Riechers
Web   : Web Site Link
F. WILLIAM SIMMONS
Professor
University Of Illinois
Soil & Water Management
104 Mumford Hall 1301 W. Gregory
Urbana, 61801, Illinois
United States
Email F. William Simmons
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Illinois have been instrumental in providing you this information. Particular thanks is given to Dean Riechers, and F. William Simmons for providing detailed information.
Herbicide Resistant Eastern Black Nightshade Globally
(Solanum ptycanthum)
Herbicide Resistant Eastern Black Nightshade Globally
(Solanum ptycanthum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Eastern Black Nightshade Globally
(Solanum ptycanthum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario2000 Corn (maize), and Soybean flumetsulam, imazamox, imazethapyr, nicosulfuron, primisulfuron-methyl, prosulfuron, and rimsulfuron 7 ALS inhibitors (B/2)
190Solanum ptycanthumEastern Black Nightshade5211
2 Canada (Ontario) CanadaOntario2009 Blueberries paraquat 7 PSI Electron Diverter (D/22)
190Solanum ptycanthumEastern Black Nightshade5493
3 United States (Wisconsin) United StatesWisconsin1999 Soybean imazamox, and imazethapyr 45 ALS inhibitors (B/2)
190Solanum ptycanthumEastern Black Nightshade1170
4 United States (North Dakota) United StatesNorth Dakota1999 Soybean imazamox, and imazethapyr 45 ALS inhibitors (B/2)
190Solanum ptycanthumEastern Black Nightshade1196
5 United States (Illinois) United StatesIllinois1999 Soybean imazamox, and imazethapyr 45 ALS inhibitors (B/2)
190Solanum ptycanthumEastern Black Nightshade5184
6 United States (Michigan) United StatesMichigan2004 Blueberries atrazine 45 Photosystem II inhibitors (C1/5)
190Solanum ptycanthumEastern Black Nightshade5286
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