HRAC GROUP 9 (LEGACY G) RESISTANT WILLOW-LEAVED LETTUCE
(Lactuca saligna)

Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Australia, Western Australia

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INTRODUCTION WILLOW-LEAVED LETTUCE Willow-leaved lettuce (Lactuca saligna) is a dicot weed in the Asteraceae family.  In Western Australia this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2017 and infests Vegetables.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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.

QUIK STATS (last updated Nov 27, 2017 ) Common Name Willow-leaved lettuce Species Lactuca saligna Group Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G) Herbicides glyphosate Location Australia, Western Australia Year 2017 Situation(s) Vegetables Contributors - (Alphabetically) Abul Hashem  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse trials comparing a known susceptible Willow-leaved lettuce biotype with this Willow-leaved lettuce 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 HRAC Group 9 resistant Willow-leaved lettuce 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 9 (Legacy G) resistant Willow-leaved lettuce from Western Australia please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS ABUL HASHEM Senior Research Officer (weed Science) Agriculture Western Australia Department Of Agriculture And Food Wa Hampton Roads Ag Res And Ext Center 1444 Diamond Springs Rd, Northam, 6401, Western Australia Australia Email Abul Hashem

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Western Australia have been instrumental in providing you this information. Particular thanks is given to Abul Hashem for providing detailed information.

Herbicide Resistant Willow-leaved lettuce Globally (Lactuca saligna) Herbicide Resistant Willow-leaved lettuce Globally (Lactuca saligna) Drag a column header and drop it here to group by that column Herbicide Resistant Willow-leaved lettuce Globally (Lactuca saligna) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Australia (Western Australia) Australia Western Australia 2017 Vegetables glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 336 Lactuca saligna Willow-leaved lettuce 17111

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