The national rust research program has released preliminary disease response
rankings for New South Wales varieties following the 2003 stripe rust
Senior rust pathologist Dr Colin Wellings says that although the results
are preliminary, they provide information on rust susceptibility, thus
helping to decide which varieties to retain for seed.
Growing conditions in 2003 contributed to the most severe stripe rust
outbreak for two decades in eastern Australia and saw the first ocurrence
in the east of the new stripe rust strain that hit Western Australia in
2002. This resulted in many wheat varieties showing less than expected
resistance to the disease.
“While the preliminary data give a basis for expected disease responses,
the actual response of a variety will depend on many factors, including
the strain of rust occurring at a particular location,” Dr Wellings
says. “We’ve ranked the responses of NSW varieties to both
the WA strain and the one associated with the variety H45 (110 E143 A+).
“While it is difficult to predict yield losses, it would be reasonable
to expect that varieties with rankings of five or less will sustain loss
when stripe rust is severe unless foliar fungicides are used.”
Growers are being encouraged to delete H45 from sowing options for 2004.
The continued use of susceptible varieties, even with effective spray
strategies in place, will form a considerable threat to those resistant
wheats currently performing well. In the interests of the industry, rust
susceptible wheats should be replaced as soon as possible.
Disease response rankings to stripe rust strains of NSW wheat
For more information:
Dr Colin Wellings, 02 9351 8826, firstname.lastname@example.org
GRDC RESEARCH CODE US315, program 3