Advances in Downy Mildew Research


Book Description

Very significant advances have been made in downy mildew research since the last major text on these oomycete fungi and the diseases they cause was published in 1981. The emphasis in this new volume is on evolution and phylogeny, control with chemicals including those that manipulate host plant defences, mechanisms of resistance, virulence and the gene pool of wild relatives of crop plants. Additionally, definitive lists of binomials and authorities provide a key reference source. The book is relevant to anyone with an interest in these unique biotrophic pathogens, either in their own right as causes of damaging diseases or as model systems for research on host-pathogen interactions. It should be read by: students, teachers and researchers in academic and research institutes; research and development personnel in the agrochemical industries; agricultural and horticultural advisers, and other extension workers.




Screening Techniques and Sources of Resistance to Downy Mildew and Rust in Pearl Millet


Book Description

Significant progress has been made in developing highly effective and reliable laboratory/greenhouse and field screening techniques and in using them to identify resistance, and to develop cultivars resistant to downy mildew (Sclerospora graminicola). Using these techniques, 4771 accessions of pearl millet, 50 accessions of intermediate weedy forms, and 534 accessions of wild relatives, originating from 40 countries, have been screened in India and/or western Africa, and a large number of resistant sources identified. More than 20 breeding products have been developed and released for cultivation in India and Africa. Similar progress in developing cultivars resistant to rust (Puccinia spp.) has been made. This bulletin describes allthe currently known screening techniques and provides relevant information on important sources of resistance to these two diseases. It is expected to be useful to breeders and pathologists involved in improving pearl millet for genetic resistance to these two important diseases.




Biotic Stress Resistance in Millets


Book Description

Biotic Stress Resistance in Millets presents an important guide to the disease and pest-related challenges of this vital food crop. Biotic stresses are one of the major constraints for millet production, but newly emerging and forward-thinking problems with disease and insect pests are likely to increase as a result of changing weather, making this an imperative book on best practices. Current strategies are mainly through the development of resistant cultivars, as the use of chemicals is cost-prohibitive to many of those producing millet in developing countries where it is of most value as a food source. This book explores non-chemical focused options for improving plant resistance and protecting crop yield. This single-volume reference will be important for researchers, teachers and students in the disciplines of Agricultural Entomology, Plant protection, Resistance Plant Breeding and Biotechnological pest management. Establishes basic concepts of host resistance providing foundational insight Synthesizes past biotic stress resistance research with the latest findings to orient research for future strategies for plant protection Focuses exclusively on host plant resistance on all major diseases and pests of millets Presents data and strategies that are globally applicable as millets gain importance as a health food







Downy Mildew Disease of Pearl Millet


Book Description

Geographical distribution. Economic importance. Symptoms. Causal organism. Asexual phase. Sexual phase. Pathogenic variability. Disease cycle. Host range. Seed transmission. Mycoparasites. Another downy mildew pathogen on pearl millet. Control methods. Cultural. Chemical. Host-plant resistance. Management strategies for the control of downy mildew. Diversification of cultivars. Use of recovery resistance. Use of fungicides. Cultural practices.




Results ...


Book Description

Twenty pearl millet genotypes representing hybrids, inbreds, popultion bulks,experimental varieties derived from populations and synthetics, along with a local check contributed by the cooperators, were tested in the IPMAT-2, 1976. Results were reported from 26 locations in 7 countries in the semi-arid tropics. The excellent support of cooperators is gratefully acknowledged. Data were received on grain yield, plant height, flowering, and disease incidence. Location summaries with statistical analyses are presented for each reporting site. Summary means over all locations are also presented for yield, plant height, days to 50% bloom and downy mildew. Results o stability analysis over 19 locations are also included. The hybrids with highest grain-yield averages over all locations were ICH 105, BK 560, ICH 13, and ICH 108. Among the populations, experimental varieties, and synthetics, Ex Bornu, WC-CX75, and Syn. 7601 gave good performances. Data from locations in West Africa and India indicate that Ex Bornu, PHB 14, WC-CX75, and NC-SX75 possess more "stable" resistance to downy mildew. The data support the view that this system of international evaluation provids an opportunity to locate areas of adaptation and identification of stable resistances to downy mildew.




Proceedings


Book Description

A comprehensive review of downy mildew and ergot of pearl millet. Downy Mildew: historical. Geographical distribution. Losses. Pathogen: taxonomy. Reproduction, asexual sexual. Seedborne nature. Oospores, production under different environments. Survival and dormancy. Germination. Degradation. Secondary spread through sporangia/zoospores. Physiological specialization. Environmental races. Artificial culture. Host range. Host: screening procedures. Measuring scale. Sources of resistance. Inheritance of resistance. Environment and agronomy: time of planting. Rotations. Fertilizer effects. Chemical control . The other downy mildew. Ergot: historical. Geographical distribution. Losses. Ergot poisoning. Pathogen: taxonomy. Reproduction, asexual, sexual. Survival. Secondary spread. Artificial culture. Host range. Host: screening procedures. Measuring scale. Sources of resistance. Physiological studies. Environment and agronomy. Control: chemicals. Removal of sclerotia by floating in salt water. Biological control. Literature cited. Some questions on downy mildew and ergot. Papers submitted by participants. Downy mildew of pearl millet in Senegal. Comments on downy mildew research. Downy mildew disease of pearl millet. Downy mildew pearl millet. Downy mildew and ergot of pearl millet. Some suggestions for research on downy mildew and ergot. Thoughts on questions raised on downy mildew and ergot of pearl millet. Ergot of pearl millet.




Millets and Sorghum


Book Description

Millets and sorghum are extremely important crops in many developing nations and because of the ability of many of them to thrive in low-moisture situations they represent some exciting opportunities for further development to address the continuing and increasing impact of global temperature increase on the sustainability of the world’s food crops. The main focus of this thorough new book is the potential for crop improvement through new and traditional methods, with the book’s main chapters covering the following crops: sorghum, pearl millet, finger millet, foxtail milet, proso millet, little millet, barnyard millet, kodo millet, tef and fonio. Further chapters cover pests and diseases, nutritional and industrial importance, novel tools for improvement, and seed systems in millets. Millets and Sorghum provides full and comprehensive coverage of these crucially important crops, their biology, world status and potential for improvement, and is an essential purchase for crop and plant scientists, and food scientists and technologists throughout the developed and developing world. All libraries in universities and research establishment where biological and agricultural sciences are studied and taught should have copies of this important book on their shelves.