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The term 'residual' applies to a number of herbicides that have a long lasting activity in the soil. These herbicides are often applied directly to the soil prior to planting crops, pre-emergent.
Windmill grass (Chloris truncata) is a native species and is the tenth most common summer weed species in the Western Australian wheatbelt.
Annual ryegrass (Lolium rigidum) is one of the most serious and costly weeds of annual winter cropping systems in southern Australia.
Testing for herbicide susceptibility allows you to determine what herbicide options are still available to control weeds on your farm.
Herbicide resistance is the inherited ability of an individual plant to survive a herbicide application that would kill a normal population of the same species.