Australian Herbicide Resistance Initiative (AHRI)

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Working in a number of research areas, AHRI has produced a large number of publications which are available to download. View the latest publications below, or search with the filter.


Interactions between crop sequences, weed populations and herbicide use in Western Australian broadacre farms: findings of a six-year survey

Six years of survey data taken from 184 paddocks spanning 14 million ha of land used for crop and pasture production in south-west western Australia were used to assess weed populations, herbicide resistance, integrated weed management (IWM) actions and herbicide use patterns in a dryland agricultural system. Key findings were that weed density within crops was low, with 72% of cropping paddocks containing fewer than 10 grass weeds/m2 at anthesis.

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Cinmethylin controls multiple herbicide resistant Lolium rigidum and its wheat selectivity is P450-based

Cinmethylin is a new (old) herbicide being commercialised by BASF that is pre-emergent selective in wheat. Cinmethylin has been shown to be an inhibitor of acyl ACP thioesterase (Campe et al 2018). Cinmethylin is available in 2020 to growers in Australia and imminent elsewhere.

In this work, led by AHRI researcher Dr Roberto Busi, cinmethylin was pre-emergent pot-tested on a large number of Lolium populations, many of which have complex patterns of resistance to other pre and post-emergence herbicides. 

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Evolution of resistance to HPPD-inhibiting herbicides in a wild radish population via enhanced herbicide metabolism

Herbicides that inhibit HPPD have become very important.  In North America, corn-selective HPPD herbicides have long been used and cases of HPPD herbicide-resistant weeds reported.  The first reported North American cases of HPPD herbicide-resistant Amaranthus weeds were cross-resistance selected by earlier-used herbicides that endow cross-resistance to HPPD herbicides (with more-recent reports being resistance evolution from direct HPPD herbicide selection).

In wheat-dominated Australian cropping, HPPD herbicides have been in use for about a decade. In this paper, the first case of resistance in Australia to HPPD herbicides is reported.  However, this HPPD resistance did not occur from HPPD herbicide selection but rather from selection with previously used herbicides (ALS, PS2, auxinic etc). In this sense, this resistant wild radish Raphanus population is similar to the first North American cases of HPPD resistant Amaranthus weeds where the HPPD resistance is CROSS resistance.  The metabolic resistance evolved from selection with earlier used herbicides (ALS, auxinic etc) and this is cross-resistance to certain HPPD herbicides.

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