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 17, 2016 )
NOTES ABOUT THIS BIOTYPE
NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH, 2016
http://dx.doi.org/10.1080/00288233.2016.1238397
Cross-resistance to auxinic herbicides in dicamba-resistant Chenopodium album H. Ghanizadeh and K. C. Harrington Institute of Agriculture and Environment, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand
ABSTRACT
The responses of two dicamba-resistant Chenopodium album (fathen) populations (L and M) were compared with the responses of two dicamba-susceptible populations (A and P) to the auxinic herbicides mecoprop, clopyralid, 2,4‐D and aminopyralid in a preliminary experiment. The dicamba-resistant fathen was cross-resistant to the pyridine carboxylic acid herbicides clopyralid and resistance; dose-response; aminopyralid, but not the phenoxy acid herbicides, 2,4-D and mecoprop. The level of cross-resistance to aminopyralid and resistance picloram (another pyridine carboxylic acid herbicide) was investigated in two separate dose-response experiments. The results of the first dose-response experiment showed populations L and M were 12 and 19 times more resistant to aminopyralid, respectively, than susceptible populations (A and P). The dicamba-resistant fathen populations were also shown to be resistant to picloram although the levels of resistance ranged from three- to 17-fold. These levels of cross-resistance for both herbicides were confirmed in the second dose-response experiment. The results of this study help with planning control strategies for this resistance problem.
ACADEMIC ASPECTS
CONTRIBUTING WEED SCIENTISTS
ACKNOWLEDGEMENTS