Dr Michael Walsh (left), from the Western Australian Herbicide Resistance Initiative (WAHRI), is wrestling with the discovery of wild radish populations with resistance to three key herbicide groups.
This resistance threatens to put an end to continuous cropping in WA’s northern wheatbelt.
In the meantime, the message to growers is to try and reduce the seedbank by incorporating other control practices – such as seed removal at harvest and crop topping– to help suppress wild radish populations.
Dr Walsh says part of the problem is the lupin rotation because it is a less competitive crop than cereals – but lupins are the only real rotation alternative for many WA growers.
Therefore it is particularly important to target wild radish populations with a range of control practices within this cropping phase.
See also: Research Update - Wild Radish: Resistance could end continuous cropping
North, South, West