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Tan spot in Central Asia

By: Postnikova, E.N | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Duveiller, E.|Dubin, H.J.|Reeves, J.|McNab, A [eds.] | Khasanov, B.A [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT|UCL|BADC : 1998ISBN: 970-648-001-3.Subject(s): Asia | Disease resistance | Fungi | Pathogens | Plant diseases | Pyrenophora | Spots | CIMMYT | TriticumDDC classification: 633.1194 Summary: In Central Asia, surveys are annually conducted to identify fungal pathogens occurring on cereal crops. Tan spot, caused by Pyrenophora tritici- repentis, was found for the first time in 1986, and has subsequently been recorded throughout Central Asia, mainly in the Djizzakh region of Uzbekistan and Kulyab region of Tadjikistan. To determine possible host plants and sources of P. tritici-repentis, Gramineae plants (four cereal and 22 wild grass species) were surveyed under natural and artificial inoculation conditions. Based on observations, it is likely that Agropyron repens, A. cristatum, Aegilops cylindrica, and Bromus inermis are potential inoculum sources. Field and greenhouse experiments were conducted to identify local resistant cultivars. No immune genotypes were found among 136 cultivars tested. Effect of temperature (2, 5, 10, and 15ºC for 2, 4, 6, 8, 10, 15, 20, 25, 30, and 35 h) on P. tritici-repentis isolates was investigated. The highest disease intensity was observed at 25 h moisture period at 15ºC. In the laboratory, various treatments were tested including light regime, medium formulation, inoculum dose. and three-way inoculum preservation. A technique for producing dry P. tritici-repentis inoculum and creating an infection background was developed.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.1194 DUV (Browse shelf) 1 Available N624337
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In Central Asia, surveys are annually conducted to identify fungal pathogens occurring on cereal crops. Tan spot, caused by Pyrenophora tritici- repentis, was found for the first time in 1986, and has subsequently been recorded throughout Central Asia, mainly in the Djizzakh region of Uzbekistan and Kulyab region of Tadjikistan. To determine possible host plants and sources of P. tritici-repentis, Gramineae plants (four cereal and 22 wild grass species) were surveyed under natural and artificial inoculation conditions. Based on observations, it is likely that Agropyron repens, A. cristatum, Aegilops cylindrica, and Bromus inermis are potential inoculum sources. Field and greenhouse experiments were conducted to identify local resistant cultivars. No immune genotypes were found among 136 cultivars tested. Effect of temperature (2, 5, 10, and 15ºC for 2, 4, 6, 8, 10, 15, 20, 25, 30, and 35 h) on P. tritici-repentis isolates was investigated. The highest disease intensity was observed at 25 h moisture period at 15ºC. In the laboratory, various treatments were tested including light regime, medium formulation, inoculum dose. and three-way inoculum preservation. A technique for producing dry P. tritici-repentis inoculum and creating an infection background was developed.

English

9806|AGRIS 9802

Jose Juan Caballero

CIMMYT Publications Collection

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