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‘Risk-aware’ growers can implement strategies to reduce and avoid unnecessary introduction and spread of weeds.
Western Australia has seen major changes to the agronomic system, including a drying climate, more intensive cropping rotations and the widespread adoption of no-till.
One-off soil inversion results in the complete burial of the water repellent topsoil in a layer typically at a depth of 15–35cm, and brings to the surface a layer of wettable subsoil.
Every grain grower has seen how well weeds grow when they have a blocked seeding tube creating extra-wide row spacing.
In-crop weed competition causes losses costing around $1 billion per annum for Western Australia.
Integrated weed management (IWM) is a system for managing weeds over the long term, and is particularly useful for managing and minimising herbicide resistance.
In an integrated weed management program, control of weeds should occur in the fallow, pre-sowing, early post-emergent and in pasture phases.
This management strategy provides an opportunity to control weed seed set in the pasture and during harvest.
Wild radish (Raphanus raphanistrum) is highly competitive in crops and can cause a yield loss of 10-90%.
Herbicide performance can vary greatly depending on a number of factors. These can include compatibility of herbicides, water quality, sprayer decontamination and controlling stressed weeds.