Jump to navigation
Skip to Content
In an integrated weed management program, control of weeds should occur in the fallow, pre-sowing, early post-emergent and in pasture phases.
In-crop weed competition causes losses costing around $1 billion per annum for Western Australia.
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.
Herbicides can be applied by a variety of means including boom sprayers, aerial spraying, misters, blanket wipers, rope wick applicators, weed seekers and back-pack sprayers.
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.
Waterlogging in some years and some environments in the high rainfall areas of south-west Western Australia can cause significant reductions in plant growth.
Waterlogging in the higher rainfall areas (more than 450mm) of south-west Western Australian crops and pastures is a common cause of reduced plant growth in winter, especially on duplex soils.
Flaxleaf and tall fleabane (Conyza spp.) are emerging weeds in Western Australia, germinating in spring and becoming major weeds in summer.
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%.
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.