A population of wild oats (Avena ludovidana Durieu) resistant to flamprop-m-methyl

摘要

Wild oats (Avena spp.) are major weeds of the Australian cropping industry and herbicide resistance has developed to many of the herbicides used for their control, Until recently there has been limited opportunity for the rotation of herbicide groupsin the post-emergent control of wild oats. Flamprop-m-methyl has been used by farmers to either delay the onset of resistance or to manage resistant populations. Flamprop-m-methyl has been considered as a herbicide with a low resistance risk developing due to its mode of action. Previous surveys of southern New South Wales in both 1991 and 1994 found no populations resistant to this herbicide. In 2001 a sample of wild oats suspected of being resistant to flamprop-m-methyl was sent to Charles Sturt University. Testing of the sample in both 2002 and 2003 resulted in greater than 80% survival at the recommended rate. Prior to 2001 this population had no exposure to flamprop-m-methyl. This finding has major implications for the management of wild oats in cropping situations.