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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.
In 2021 the Department is conducting over 300 research trials across the state from Kununurra in the north to Esperance in the south.
Options for control of winter broad leaved weeds, in pastures, is a common inquiry. A fairly reliable method is spray grazing.
Pasture manipulation is the application of herbicides for grass control early in the growing season (autumn or early winter).
It is often the preferred option for grass control.