Robert Loughman

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An uncharacterized source of seedling resistance to Puccinia striiformis f.sp. tritici was identified in an advanced wheat breeding line WAWHT2046. Genetic analysis based on a WAWHT2046/Carnamah-derived double haploid (DH) population demonstrated monogenic inheritance of seedling stripe rust resistance in WAWHT2046. The gene controlling stripe rust(More)
To study the loss of grain yield associated with specific levels of spot-type net blotch of barley, experiments were conducted at three sites with between four and six different levels of application of the fungicide propiconazole or mixtures of propiconazole and iprodione applied to obtain a wide range of disease levels. Yield loss varied from 23 to 44%.(More)
Net blotch, caused by Pyrenophora teres Drechs. (anamorph: Drechslera teres (Sacc.) Shoemaker), is a prominent foliar disease of barley (Hordeum vulgare L. emend. Bowden) in Western Australia (19,46), as well as elsewhere in the world (13,28,31,34,39,41). Two types of leaf symptoms are associated with the net blotch disease: the net type, caused by P. teres(More)
Adult plant resistance (APR) is considered potentially more durable for controlling barley leaf rust than seedling Rph (Resistance to Puccinia hordei) genes. A major gene for adult plant resistance to barley leaf rust has been mapped to the telomere region of chromosome 5HS. PCR-based molecular markers were developed for saturation of this region based on(More)
Wheat stripe rust (caused by Puccinia striiformis f. sp. tritici) was reported for the first time in Western Australia in August 2002. The pathogen, although present in eastern Australia since 1979, has failed to move westwards due presumably to quarantine precautions, the influence of west to east weather movements and the imposing geographic barrier(More)
Stagonospora nodorum blotch (SNB) caused by Stagonospora nodorum is a severe disease of wheat (Triticum aestivum) in many areas of the world. S. nodorum affects both seedling and adult plants causing necrosis of leaf and glume tissue, inhibiting photosynthetic capabilities, and reducing grain yield. The aims of this study were to evaluate disease response(More)
Yellow or tan spot (caused by Pyrenophora tritici-repentis) and septoria nodorum blotch (caused by Phaeosphaeria nodorum) occur together and are a constraint to wheat yields in Australia. Recently, higher crop yields and lower fungicide costs have made fungicides an attractive management tool against these diseases. Yield-loss under different rates of(More)
Shrivelled, bleached wheat grain detected by bulk grain handlers during quality checks was submitted to AGWESTPlant Laboratories, Department of Agriculture and Food, Western Australia. Fusarium graminearum was detected. Further testing of the wheat grain delivered to bulk silos found other Fusarium spp. associated with the grain samples. This is the first(More)
Pyrenophora tritici-repentis (anamorph: Drechslera tritici-repentis) causes yellow spot of wheat. The disease can be responsible for yield losses of 30–50% and, when severe, requires management with fungicide. Forty-five single conidium isolates collected from the northern wheatbelt of Western Australia were tested for sensitivity to three triazole(More)
Pseudothecia carrying asci with mature ascospores of Drechslera teres f. maculata were isolated from barley stubble from the southern part of Western Australia. Inoculation experiments were able to produce typical spot-type net blotch symptoms on the barley cultivar Gairdner. This is the first confirmed report of this teleomorph in Australia.