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Wild radish (Raphanus raphanistrum) is highly competitive in crops and can cause a yield loss of 10-90%.
Glaucous star thistle (Carthamus leucocaulos) is an uncommon weed in Western Australia (WA). This article describes the nature of the plant.
Chinee apple, Indian jujube (Ziziphus mauritiana) is a declared pest in Western Australia (WA).
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.
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.
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.
In-crop weed competition causes losses costing around $1 billion per annum for Western Australia.
Brooms, including scotch broom and needle leaved broom (Cytisus scoparius, Genista linifolia, Genista monspessulana) that have been designated as Weeds of National Signif