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Yellow spot (Tan spot) Tan brown-flecks turning into yellow-brown oval shaped spots/lesions surrounded by yellow margins, may expand into 10-12 mm in diameter. Large lesions coalesce with dark brown centers. Spot develops on both sides of leaves. Temperature from 20ºC to 30ºC and free moisture favours disease development. In susceptible cultivars yellow spot can . . . → Read More: Wheat rusts - Yellow Spot (Tan Spot) Leaf rust Leaf rust is caused by the fungus Puccinia triticinia (previously called Puccinia recondite f. sp. tritici). The disease can also infect rye. Leaf rust produces reddish-orange to reddish-brown spores which occur in small, 1.5 mm, oval pustules. These are found on the top surface of the leaves, distinguishing leaf rust from stem . . . → Read More: Wheat rusts - Stem Rust and Leaf Rust Key points for Wheat Rusts Reduce the risk of rusts in wheat by: Destroy volunteer wheat plants by March, which can provide a greenbridge for rust carryover Community efforts required to eradicate volunteers from roadsides, railway lines, bridges, paddocks and around silos Crop rotation is very important in case of yellow spot and Fusarium . . . → Read More: Wheat Rusts - Stripe Rust (Yellow Rust) Crop establishment Factors affecting crop establishment Poor seedling establishment occurs because of: inaccurate or variable seed depth poor seed-soil contact poor quality seed unsuitable soil temperatures soil insects and soil disease herbicide residues. The impact of poor establishment and seedling vigour will be reduced if seedbed requirements are matched to machinery capabilities and seed . . . → Read More: Planting of Wheat - Crop Establishment, Weeds and Irrigation Depth control The addition of an airseeder unit will not necessarily convert an acceptable tillage implement into an acceptable planting implement. Positive depth control of planting machines in the form of mechanical depth stops or a hydraulic stop is essential to avoid hydraulic creep. Some other compromises to minimise depth variation: Frame length and . . . → Read More: Planting of Wheat - Depth Control and Deep Moisture Planting time Timing of the wheat planting is critical. Planting early generally increases the yield potential but also results in higher frost risk. Note that high soil temperatures can reduce establishment. Different varieties have been bred to suit different planting times. Plant population Chances of optimal yields are improved by establishing at least 700,000 . . . → Read More: Planting of Wheat |
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