Publications

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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The paper "Non-target site resistance to PDS-inhibiting herbicides in a wild radish Raphanus raphanistrum population" is the work of AHRI PhD student Huan Lu.  The phytoene desaturase inhibiting herbicide diflufenican has been widely used in Australia (often in a mixture), especially targeted at wild radish Raphanus control.  Consequently, resistance to PSD inhibiting herbicides is known and this work documents PDS herbicide resistance in a wild radish population.  

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