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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.
Hyssop loosestrife (Lythrum hyssopifolia) is a widely distributed weed in the south west of Western Australia.
Following the extended dry conditions this autumn, weeds are now emerging and becoming a challenge for growers to manage in paddocks that may have patchy crops, crops with staggered emergence or no
Options for control of winter broad leaved weeds, in pastures, is a common inquiry. A fairly reliable method is spray grazing.
'Crop-topping' is the late application of herbicides to prevent weed seed-set.
Spray-topping is a very effective method for managing annual grass seed set in pastures.
Testing for herbicide susceptibility allows you to determine what herbicide options are still available to control weeds on your farm.
Summer weeds can rob subsequent crops of soil nitrogen and stored soil water. They can also reduce crop emergence by causing physical and/or chemical interference at seeding time.