Field survey of flupropanate-resistant Nassella trichotoma in Victoria
2008
A population of Nassella trichotoma (serrated
tussock) in Victoria was confirmed as resistant
to flupropanate (sodium 2,2,3,3-tetrafluoropropionate)
at a property north-west of Melbourne in 2002. To
determine the spread of flupropanate resistance, 87
N. trichotoma plants were collected randomly from
paddocks and on roadsides within 5 km of the resistant
plants in 2003. A pot-dose method of resistance
assessment identified plants resistant to flupropanate
up to 3.5 km from the site where resistant plants were
initially identified. Seeds from these plants showed
0.100% resistance, with sensitive plants often having
a low (.5%) level of resistant seed. These results
suggest movement of flupropanate resistance through
seeds or pollen and show that its spread had occurred
within one year of detection. This research emphasises
the importance of integrated weed management and
the need to rotate herbicide groups to avoid the risk
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