• Document: Downy Mildew Disease of Pearl Millet
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Downy Mildew Disease of Pearl Millet Information Bulletin no. 37 International Crops Research Institute for the Semi-Arid Tropics Abstract Citation: Singh, S.D., King, S.B., and Weraer, J. 1993. Downy mildew disease of pearl millet. Infor­ mation Bulletin no. 37. (In En. Summaries in Fr, Es.) Patancheru, A.P. 502 324, India: International Crops Research Institute for the Semi-Arid Tropics. 36 pp. ISBN 92-9066-257-3. Order code: IBE 037. Downy mildew (Sclerospora graminicola) is the most important disease of pearl millet (Pe1!nisetllm glal/cl/m). It often results in almost total loss of grain yield due to complete or partial conversion of florets to leafy structures instead of grain ('green ear'). Although the disease is present in many countries of the world, it is particularly important in western Africa, and in India, where it has caused several severe and widespread epidemics and is a major threat to the cultivation of Fl hybrids. Considerable progress, reported in this bulletin, has been made in understanding pathogen biology and disease epidemiology. This has led to the development of effective and reliable laboratory / greenhouse and field-screening techniques, identification of resistant sources, and use of resistance in breeding programs to develop resistant cultivars. Alternative control measures, particularly with fungicides, have been developed. Resume Le mildiou dl/ mil. Le mildiou (Sclerospora graminicola) est la plus grave des maladies du mil (PeJlllisetl/m glal/cl/m). II peut souvent detruire la quasi-totalite du rendement en grain. Les fleurs des plants infectes peuvent etre completement ou partiellement transformees en organes foliaces au lieu de grains (Ie symptome de "I'epi vert"). Bien que Ie mildiou du mil sevisse dans plusiurs pays, il est particuliere­ ment important en Afrique de l'Ouest, et en Inde, ou il a souvent atteint des niveaux epidemiques et a constitue une principale contrainte it la culture des hybrides Fl. L'ouvrage rend compte du progres sensible fait dans I'etude de la biologie de l'agent pathogene et de l'epidemiologie de la maladie. Cet avancement a permis la mise au point des techniques de criblage efficaces et fiables con�es pour etre utilisees au laboratoire, en serre et en champ; l'identification des sources resistantes; et I'utilisation de la resistance aux programmes de selection afin de creer des cultivars resistants. D' autres methodes de lutte, surtout avec des fongicides, ont ete egalement elaborees. Resumen Mildill ell el CI/ltivo de mijo. Le mildiu (Sclerospora gramillicola) es la enfermedad mas importante que afecta el cultivo de mijo (Pel1llisetl/m glal/cum). Resulta en la perdida caci total de la rendicion de granos a causa de la conversion completa 0 parcial de las florecillas a una espigas hojosas en vez de granos. Aunque dicha enfermedad se halla en varios pafses del mundo, es mucho mas grave en caso de la Africa del Oeste, y India, donde ha causado epidemias severas y muy extendidas y constituye una amenaza enorme a la cultivacion de hfbridos Fl. Como sefiala este boletfn, se ha hecho bastante progreso en el campo de bidogfa patogenica asf como en la epidemiologfa de enfermedades. Esto ha facilitado el desenvolvimiento de tecnicas eficaces y seguras tanto en el laboratorio 0 en el invernaculo como en el campo, la identificacion de fuentes resistentes y el uso de resistencia en programas de crianza a fin de desenvolver cultivares resistentes. Se han elaborado medidas alternativas de control, particularmente en 10 que concierne a las fungicidas. Cover: An aerial view of a downy mildew field-screening nursery at ICRISAT Center, showing the tall infector rows, and the test material in between. Inset: Disease-free (left) and malformed earheads (green ear, right). Downy Mildew Disease of Pearl Millet S.D. Singh S.B. King J. Werder , U • ICRISAT Information Bulletin no. 37 International Crops Research Institute for the Semi-Arid Tropics Patanchem, Andhra Pradesh 502 324, India 1993 The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of ICRISAT concerning the legal status of any country, territory, city, or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. Where trade names are used this does not constitute endorsement of or discrimination against any product by the Institute. Copyright<e> 1993 by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). All rights reserved. Except for quotations

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