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This is the proceedings of the Eighth Asian Regional Maize Workshop, held in Bangkok, Thailand, during 5-8 August 2002, and co-sponsored by International Maize and Wheat Improvement Center, the Department of Agriculture of Thailand, and Kasetsart Universi
antoine persoons Daniel Bebber Rose Kigathi Vanessa Bueno Sancho Pilar Corredor-Moreno Sophie Harrington Ngonidzashe Kangara Anna Berlin Mogens Hovmoller JULIO HUERTA-ESPINO Muhammad Imtiaz Annemarie Fejer Justesen Rients Niks Zacharias Pretorius Ramin Roohparvar Hanan Sela Ravi Singh Brian Steffenson Botma Visser Brande Wulff (2018)
Wheat stem rust, a devastating disease of wheat and barley caused by the fungal pathogen Puccinia graminis f. sp. tritici, was largely eradicated in Western Europe during the mid-to-late twentieth century. However, isolated outbreaks have occurred in recent years. Here we investigate whether a lack of resistance in modern European varieties, increased presence of its alternate host barberry and changes in climatic conditions could be facilitating its resurgence. We report the first wheat stem rust occurrence in the United Kingdom in nearly 60 years, with only 20% of UK wheat varieties resistant to this strain. Climate changes over the past 25 years also suggest increasingly conducive conditions for infection. Furthermore, we document the first occurrence in decades of P. graminis on barberry in the UK . Our data illustrate that wheat stem rust does occur in the UK and, when climatic conditions are conducive, could severely harm wheat and barley production.
Etienne Duveiller (1998)
This proceedings documents the results of a unique opportunity for CIMMYf scientists and their colleagues to exchange information on these two important diseases. The papers and workshop discussions presented here should provide a useful record for workshop participants. The proceedings also should prove to be a valuable reference for scientists who could not attend these meetings, researchers who work to reduce grain losses in the warmer production areas of developing countries, and their counterparts in.other parts of the world.
Bipolaris Blights Blotches Cropping systems Diagnosis Disease control Disease resistance Helminthosporium Pathogens Plant diseases Selection Spring crops Toxins Wheats CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA
Etienne Duveiller (1997)
The most common bacterial pathogens that attack wheat are grouped under the names Xanthomonas translucens and Pseudomonas syringae. Pathovars (bacterial strains pathogenic to a specific host or hosts) included in X. translucens can cause significant crop losses, while the ones grouped under P. syringae may severely affect the grain quality of wheat and are widely distributed in many temperate and subtropical wheat-growing regions. There is also a range of other bacterial diseases that have a more limited distribution or may cause crop losses just in certain localities. All of these are the subject of the present manual, which focuses on identifying and managing wheat bacterial diseases. It presents concepts and methods that will help those not familiar with bacterial diseases to correctly identify and diagnose them. Despite numerous reports of bacterial diseases on wheat worldwide, the study of bacterial diseases on wheat and triticale has been limited, and information on how to handle them is rarely available. Managing bacterial diseases is somewhat complex and often requires an integrated approach combining adequate control measures and breeding for genetic resistance. The authors of this manual have therefore included general principles and guidelines to help breeders and pathologists to both control these diseases and select for genetic resistance.
Presented at Training on MLN rapid diagnosis test and MLN free seed production 30th & 31st July, 2018. Nairobi, Kenya.
Tar spot complex (TSC), caused by at least two fungal pathogens, Phyllachora maydis and Monographella maydis, is one of the major foliar diseases of maize in Central and South America. P. maydis was also detected in the United States of America in 2015 and since then the pathogen has spread in the maize growing regions of the country. Although remote sensing (RS) techniques are increasingly being used for plant phenotyping, they have not been applied to phenotyping TSC resistance in maize. In this study, several multispectral vegetation indices (VIs) and thermal imaging of maize plots under disease pressure and disease-free conditions were tested using an unmanned aerial vehicle (UAV) over two crop seasons. A strong relationship between grain yield, a vegetative index (MCARI2), and canopy temperature was observed under disease pressure. A strong relationship was also observed between the area under the disease progress curve of TSC and three vegetative indices (RDVI, MCARI1, and MCARI2). In addition, we demonstrated that TSC could cause up to 58% yield loss in the most susceptible maize hybrids. Our results suggest that the RS techniques tested in this study could be used for high throughput phenotyping of TSC resistance and potentially for other foliar diseases of maize. This may help reduce the cost and time required for the development of improved maize germplasm. Challenges and opportunities in the use of RS technologies for disease resistance phenotyping are discussed.
Tar Spot Fungal Pathogens Phyllachora Maydis Monographella Maydis Grain Yield CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA FUNGAL DISEASES MAIZE DISEASE CONTROL DISEASE RESISTANCE AGRICULTURAL SCIENCES AND BIOTECHNOLOGY