BRENDON CANT brendon at iinet.net.au
Wed Apr 4 10:47:32 CEST 2007


DOUBLEGEE HURTS: Herbicide resistance has reared its 'ugly head' again, but
this time in the spiky weed, doublegee.
GRDC supported research has confirmed one case of metsulfuron-methyl
resistance in doublegee within the northern agricultural region of WA.
Department of Agriculture and Food senior research officer, Dr Abul Hashem
said the population was five times more resistant to metsulfuron-methyl than
other susceptible doublegee populations.
"Similar resistance may be present in many other doublegee populations that
are yet to be identified and characterised in WA.
"However, this metsulfuron-methyl resistant population is susceptible to all
group C herbicides, such as atrazine, bromoxynil, cyanazine, diuron,
metribuzin and simazine.
"More research is needed to confirm the resistance of this population to
other group B herbicides, such as triasulfuron and imazethapyr," Dr Hashem
Contact: Dr Abul Hashem, Mob 0413 599 580
FUNGICIDE REDUCES STRIPE RUST: Fungicides can reduce the incidence and
severity of stripe rust infection and reduce yield loss.
In 2006, GRDC supported trials in the Esperance district sought to determine
what fungicide protection was needed to manage stripe rust in adult plant
resistant (APR) wheat varieties, such as GBA Sapphire.
GRDC supported researcher, Geoff Thomas of the Department of Agriculture and
Food said GBA Sapphire wheat (and other varieties) had APR, which could
limit stripe rust development.
"However, with early infection and in conditions favourable to the disease,
yield losses can still occur in these APR type varieties.
"Under these conditions, applying fungicide early can be an effective tool
for reducing yield loss.
"Yield response to fungicide application is possible in high yielding APR
crops," Mr Thomas said.
Contact: Geoff Thomas, Tel 08 9368 3262
 Authorised by Grains Research & Development Corporation (GRDC)
 and issued on its behalf by
Brendon Cant & Associates, Tel 08 9384 1122












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