[ASC-media] GETTING TO THE ROOT OF RUST CONTROL: crop Doctor
brendon at iinet.net.au
Thu May 4 14:19:36 EST 2006
GETTING TO THE ROOT OF RUST CONTROL
Recent trials suggest that even in low leaf disease years, growers can save
up to 320kg/ha of yield if they pre-emptively use fungicides against stripe
While the Grains Research and Development Corporation (GRDC) advocates the
selection of resistant varieties to combat stripe rust, which can rob yields
by up to 60 per cent, fungicide application at seeding provides a good
When Department of Agriculture and Food and Farm Focus Consultants worked
with susceptible and moderately susceptible wheat varieties in 2004, they
revealed just how effective fungicides could be when pre-emptively applied
at seeding on wheat going into wheat stubble.
Flutriafol at 300mL/ha during seeding produced a 65kg/ha increase in yield
under low leaf disease pressure. After the delayed appearance of rusty
stripes, a subsequent spray with 250mL/ha of propiconazole helped bump the
yield saving to more than 300kg/ha.
And the benefit wasn't limited to yield, with grain protein climbing 0.2 per
cent and screenings dropping by 2.2 per cent in the twice-treated wheat.
After crunching numbers on the susceptible Arrino crop, the saved yield
equated to $67.50/ha extra at port. After meeting the $25/ha fungicide
costs, that left researchers Jeff Russell, Angie Roe and James Eyres with
$42/ha in the pocket.
In 2005, the researchers compared flutriafol and fluquinconazole as the two
seeding treatments and found that the former stacked up best. Although
fluquinconazole-treated crops showed fewer signs of leaf disease during the
season, it was flutriafol that delivered 4.5 per cent yield response when
applied at rates of 250 to 400mL/ha.
This superior result may have been because flutriafol also provides Take All
control, while fluquinconazole does not at the tested rate of 3L/tonne of
seed and a seeding rate of 68kg/ha.
Given mild leaf disease pressure in 2005, root disease may have been a
bigger obstacle to yield on the wheat in wheat stubble. Stripe rust did not
hit the plot in 2005 and so in-season spraying strategies could not be
re-tested that year.
With much of the grainbelt experiencing a green summer, 2006-07 disease
pressure is likely to be fairly high, so every precaution should be
considered to manage stripe rust on the farm and in the district.
The Crop Doctor is GRDC Managing Director, Peter Reading, Tel 02 6272 5525
Further Information: James Eyres, Tel 08 9622 5095
Brendon Cant & Associates
Public Relations & Marketing
4 Gugeri St
Claremont WA 6010
Tel 08 9384 1122
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