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Leaf blight diseases and associated soilborne fungal pathogens of wheat in South and Southeast Asia

By: Saari, E.E | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Duveiller, E.|Dubin, H.J.|Reeves, J.|McNab, A [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT*UCL*BADC : 1998Description: p. 37-51.ISBN: 970-648-001-3.Subject(s): Blights | Fungi | Helminthosporium | Nepal | Pathogens | Plant diseases | Pyrenophora | South Asia | South east Asia | CIMMYT | TriticumSummary: There are two helminthosporium leaf blight (HLB) diseases in South Asia: Bipolaris sorokiniana and Pyrenophora tritici-repentis, causing spot blotch and tan spot, respectively. Spot blotch dominates in the warmer, humid areas, whereas tan spot prevails in cooler seasons in north-central India and southern Nepal. In eastern India, Bangladesh, and countries of Southeast Asia, B. sorokiniana is often the only HLB species isolated. HLB increased in importance after the "green revolution." Three factors appear to be responsible: the rice-wheat cropping system, an increase in inoculum potential associated with this system, and the incorporation of leaf rust resistance. HLB has been obscured where LR has dominated. Breeding for HLB resistance has been difficult. The spot blotch pathogen is genetically dynamic and overcomes resistance. Tolerance or slow disease development is often associated with late maturity. The economic losses due to spot blotch exceed 20% in South Asia. Losses caused by tan spot are not well documented and often confounded because wheat is either a minor or an experimental crop in Southeast Asia. Spot blotch is a limiting factor to wheat production; it is explosive, and complete crop loss is possible. Without disease resistance or an economical fungicide treatment, wheat production in these environments is hazardous.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection 1 Available F624337
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There are two helminthosporium leaf blight (HLB) diseases in South Asia: Bipolaris sorokiniana and Pyrenophora tritici-repentis, causing spot blotch and tan spot, respectively. Spot blotch dominates in the warmer, humid areas, whereas tan spot prevails in cooler seasons in north-central India and southern Nepal. In eastern India, Bangladesh, and countries of Southeast Asia, B. sorokiniana is often the only HLB species isolated. HLB increased in importance after the "green revolution." Three factors appear to be responsible: the rice-wheat cropping system, an increase in inoculum potential associated with this system, and the incorporation of leaf rust resistance. HLB has been obscured where LR has dominated. Breeding for HLB resistance has been difficult. The spot blotch pathogen is genetically dynamic and overcomes resistance. Tolerance or slow disease development is often associated with late maturity. The economic losses due to spot blotch exceed 20% in South Asia. Losses caused by tan spot are not well documented and often confounded because wheat is either a minor or an experimental crop in Southeast Asia. Spot blotch is a limiting factor to wheat production; it is explosive, and complete crop loss is possible. Without disease resistance or an economical fungicide treatment, wheat production in these environments is hazardous.

English

9806|AGRIS 9802|anterior|R97-98PROCE|FINAL9798

Jose Juan Caballero

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