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Integrated disease management of wheat rusts and yellow spot
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Destroy volunteer wheat plants by March, as they can provide a greenbridge for rust carryover... The spores require 15 to 20 C temperature and free moisture (dew/rain/irrigation) on the leaves to successfully infect wheat... Stem rust develops at higher temperatures than the other wheat rusts within a range of 18-30 C. Spores require free moisture (dew, rain or irrigation) and take up to six hours to infect the plant and pustules can be seen after 10-20 days of infection...
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Broadacre Field Crops DAFF QLD