MAIN
ROADS — WEEDS — ROAD VERGES
863. Hon
COLIN de GRUSSA to the Leader of the House representing the Minister for
Transport:
I refer to the growth of resistant
weed populations on road verges managed by Main Roads Western Australia.
(1) Does Main
Roads regularly test or assess weed populations for herbicide resistance; and
who provides these services?
(2) How many populations of resistant weeds have been
identified on main road verges and where are they located?
(3) What
procedures and policies are in place to manage herbicide resistant weed
populations on road verges? Please table any relevant policies or guidelines
used internally by Main Roads.
Hon
STEPHEN DAWSON replied:
I thank the honourable member for
some notice of the question. The following answer is provided on behalf of the
Minister for Transport.
(1)–(3) Testing is conducted if potential resistance is
identified. Several known populations of glyphosate-resistant rye-grass
are located on multiple roads around Albany, Northam, Cranbrook Road near York
and the Perth–Bunbury highway from
Lake Clifton to past Bunbury and along South West Highway to Donnybrook.