INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
Dotted Duckweed (Landoltia punctata) is a dicot weed in the Lemnaceae family. In Florida this weed first evolved resistance to Group 22 (Legacy D) herbicides in 2001 and infests Aquatic. Group 22 (Legacy D) herbicides are known as PS I Electron Diversion
(PSI Electron Diversion
). Research has shown that these particular biotypes are resistant to diquat, and paraquat and they may be cross-resistant to other Group 22 (Legacy D) 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.
|PS I Electron Diversion
HRAC Group 22 (Legacy D)
|diquat, and paraquat
|United States, Florida
|Contributors - (Alphabetically)
|Laboratory trials comparing a known susceptible Dotted Duckweed biotype with this Dotted Duckweed 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 HRAC Group 22 resistant Dotted Duckweed 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
|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.
|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 22 (Legacy D) resistant Dotted Duckweed from Florida please update the database.
|Visiting Assistant Professor
University Of Florida
915 W State St
Gainesville, 32653, Florida
Email Tyler Koschnick
|Drag a column header and drop it here to group by that column
|United States (Florida)
diquat, and paraquat
PS I Electron Diversion
( HRAC Group 22 (Legacy D)
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online.
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