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 May 07, 2017 )
NOTES ABOUT THIS BIOTYPE
April 2017 Update
12 verified cases. Most of these cases are seed samples sent by farmers or consultants on suspicion of resistance. They have been tested in pot experiments including a susceptible and resistant reference population. Tribenuron-methyl and florasulam have been applied in 4-6 doses. A survey on untreated plots in agricultural fields all over Denmark showed that P. rhoeas was resistant in 5% of the fields (to be presented in Denver in May). Genotyping: Molecular analysis of a few samples has shown a mutation at the 197 position
CONTRIBUTING WEED SCIENTISTS