It is always recommended to use Integrated Weed Management (IWM) techniques in conjunction with the use of any chemicals, including Avadex Xtra and TriflurX.
Agronomic and IWM practices that reduce the weed seed bank in the soil prior to the use of Avadex Xtra and TriflurX will result in higher levels of weed control. Paddocks with excessively high weed seed banks may have sufficient surviving weed numbers such that final weed control may be considered below a commercially acceptable level and additional herbicide treatments may be necessary.
The GRDC have prepared two handy fact sheets on resistance:
The use of IWM techniques will also reduce the potential for the development or survival of Group D herbicide resistance weed biotypes. TriflurX is a member of the dinitroaniline group of herbicides. For weed resistance management purposes it is a Group D herbicide.
Some naturally occurring weed biotypes resistant to TriflurX and other Group D herbicides may exist through normal genetic variability in any weed population. TriflurX or other Group D herbicides will not control these resistant weeds. The resistant individuals can eventually dominate the weed population if these herbicides are used repeatedly.
As a member of the thiocarbamate group of herbicides, Avadex Xtra has a mode of action that inhibits mitosis. For weed resistance management purposes, it is classified as a Group J herbicide.
Some naturally occurring weed biotypes resistant to Avadex Xtra and other Group J herbicides may exist through normal genetic variability in any weed population. These weeds will not be controlled by Avadex Xtra or other Group J herbicides. The resistant individuals can eventually dominate the weed population if these herbicides are used repeatedly.
Since the occurrence of resistant weeds is difficult to detect prior to use, Nufarm Australia Limited accepts no liability for any losses that may result from the failure of Avadex Xtra and/or TriflurX to control resistant weeds.
Independent research trials conducted by Peter Boutsalis from Plant Science Consulting, and the University of Adelaide from 2007 to 2009 investigated the sensitivity of 20 annual ryegrass biotypes from across four states to Avadex Xtra.