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Disease experts warned wheat rust
Aug. 31, 2012
Grain growers are being urged to monitor their crops closely following an increase in reports of stripe rust in wheat.
Disease experts say growers should also be considering rust management programs to reduce the risk of yeild loss.
Stripe rust has been reported in crops growing in central and western Victoria as well as many parts of South Australia.
Stem rust of wheat has also been found on volunteer wheat growing in the Victorian Mallee, serving as a reminder that there has been some carryover of this disease.
Stem rust is favoured by warm and humid conditions and is likely to be observed in crops from mid spring onwards, especially following a wetter than average spring.
Stripe rust has been reported in crops growing in central and western Victoria as well as many parts of South Australia.
Stem rust of wheat has also been found on volunteer wheat growing in the Victorian Mallee, serving as a reminder that there has been some carryover of this disease.
Stem rust is favoured by warm and humid conditions and is likely to be observed in crops from mid spring onwards, especially following a wetter than average spring.
Australian Cereal Rust Control Program consultative committee chairman Grant Hollaway said monitoring crops was vital.
Dr Hollaway said growers could monitor crops by visually assessing thicker patches and by walking through a paddock to get a more accurate assessment of the whole crop.
Growers should inspect the lower parts of the plant, the stem and the leaves for rust symptoms.
Dr Hollaway said growers could monitor crops by visually assessing thicker patches and by walking through a paddock to get a more accurate assessment of the whole crop.
Growers should inspect the lower parts of the plant, the stem and the leaves for rust symptoms.
"Timing is critical for the effective control of rust diseases with fungicides," Dr Hollaway said.
" Varieties that are susceptible, moderately susceptible, and moderately resistant to moderately susceptible will need to be monitored regularly if fungicide protection has not been applied at sowing.
"In these cases, fungicide application should be considered at the first appearance of symptoms. Monitoring should then continue, as protection periods following foliar fungicides will vary according to chemical product and growth rate of the crop."
Dr Hollaway recommended that growers unsure of how susceptible their varieties are, or which is the best approach to take, check with their local agronomist, plant pathologist, regional variety guide or visit the Rust Bust website.
" Varieties that are susceptible, moderately susceptible, and moderately resistant to moderately susceptible will need to be monitored regularly if fungicide protection has not been applied at sowing.
"In these cases, fungicide application should be considered at the first appearance of symptoms. Monitoring should then continue, as protection periods following foliar fungicides will vary according to chemical product and growth rate of the crop."
Dr Hollaway recommended that growers unsure of how susceptible their varieties are, or which is the best approach to take, check with their local agronomist, plant pathologist, regional variety guide or visit the Rust Bust website.
Source: weeklytimesnow
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