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Guidelines for Use of Foliar Sprays to Control Stripe Rust of Wheat in Australia. J. S. Brown, Plant Pathologist, Victorian Crops Research Institute, Private Bag 260, Horsham, Victoria 3400, Australia. R. J. Holmes, Plant Pathologist, Victorian Crops Research Institute, Private Bag 260, Horsham, Victoria 3400, Australia. Plant Dis. 67:485-487. Accepted for publication 5 November 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-485.

Guidelines have been developed that advise Australian farmers when to spray wheat (Triticum aestivum) crops to control stripe rust (Puccinia striiformis). These guidelines state that crops should be sprayed with a suitable fungicide when 1% of the leaf area is affected by stripe rust (equivalent to 3540 affected leaves per 100 examined) provided the predicted yield loss is sufficient to make spraying economical. Prediction of yield loss is based on the apparent infection rate in the cultivar and on the time in the growing season when 1% of the leaf area is affected by stripe rust.