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The most accurate way to estimate the weed population of a paddock is to count the number of plants in an area of known size at a number of locations.
In Western Australia, competition from 7-90 capeweed plants per square metre in a wheat crop can reduce crop yield by 28-44% and net return by 25-76%.
Management of weeds, disease and nitrogen nutrition are ongoing challenges that limit yield potential.
Flaxleaf and tall fleabane (Conyza spp.) are emerging weeds in Western Australia, germinating in spring and becoming major weeds in summer.
Doublegee or spiny emex is a significant weed in Western Australia. It is a vigorous annual herb with a strong tap root and a long, fleshy, hairless stem.
One method of weed control is to remove weed seeds in the fallow, stubble and pre-sowing phase.
Herbicide resistance is the inherited ability of an individual plant to survive a herbicide application that would kill a normal population of the same species.
Silver grass is an annual grass occurring in both cropping and grazing regions across Australia. There are several species, the most common being Vulpia myuros and V. bromoides.
Barley grass is a common name for Hordeum glaucum and H. leporinum.
This trial examines the positive impact of crop competition, crop type rotation and the mouldboard plough on weed management.