In Australian cropping systems, some farmers have started using the concept of tactic groups to improve long-term weed management. Individual weed management tactics are packaged into tactic groups according to the target growth stage of the weed. In a cropping system, combining tactic groups reduces weed numbers, stops replenishment of the seedbank and minimises the risk of developing herbicide-resistant weeds. The same principals apply to weed management in vineyards.
The AWRI has adapted the Grains, Research & Development Corporation (GRDC) table of weed control tactics for cropping systems to suit vineyards.
|Weed control tactic||Mode of action||Method/tool||Method details|
|Deplete weed seed in target area||Encourage germination of weeds – and subsequently kill them||Autumn tickle||A shallow cultivation pass used to stimulate even weed seed germination by bringing weed seeds to the soil surface. When the weeds germinate, they can be controlled with a second cultivation pass. This tactic is ideal for weeds that break germination easily such as annual ryegrass, paradoxa grass and wild radish.|
|Kill weeds in target area||Kill weeds, particularly seedlings||Double knock||The sequential application of two different weed control tools/practices 7-14 days apart ensures that the second pass controls any survivors of the first pass.|
|Cultivation||Good weed control can be achieved by cultivating weeds when they are small and when cultivation coincides with hot, dry weather and dry soils.|
|Stop weed seed set||Control weeds before they have a chance to flower and set seed||Mowing/grazing||Mowing or grazing operations timed before weed flowering and seed set can prevent the accumulation of new seeds in the seedbed.|
|Prevent weed growth in target area||Suppress weed germination||Mulch/sown swards/
|Prevents seeds from germinating by blocking sunlight from reaching the soil surface|
Integrated weed management in Australian cropping systems (Grains Research and Development Corporation publication)