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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.
Four summer weed time of removal trials were implemented across the Western Australian wheatbelt in March 2017 following a widespread summer rainfall event.
Growers have eroded their ryegrass seedbanks by 99.3% from an average of 183 ryegrass/m2 in 2001 to 1.29 ryegrass/m2 in 2018 across the 27 focus paddocks.
Options for control of winter broad leaved weeds, in pastures, is a common inquiry. A fairly reliable method is spray grazing.
Tar vine (Boerhavia coccinea) is found throughout Australia, with the exception of Tasmania.
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.
Wild radish (Raphanus raphanistrum) is highly competitive in crops and can cause a yield loss of 10-90%.
One method of weed control is to remove weed seeds in the fallow, stubble and pre-sowing phase.