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UKAID Department for International Development (R4D) 1989

Pathology investigation of the sorghum shoot disease complex in the semi-arid tropics

Sorghum Disease

UKAID Department for International Development (R4D)

Titre : Pathology investigation of the sorghum shoot disease complex in the semi-arid tropics

Pays : Botswana, Malawi, Mali, Niger, Nigeria, Zimbabwe, Tanzania, Burkina Faso, Zambia

Projet de recherche pour le Développement : R5765

DFID Programme : Integrated Pest Management

Organismes de mise en œuvre _ Lead Institutes : University of Reading
Managing Institutes : Rural Livelihoods Department, Department for International Development (UK) (RLD)

Durée : Start Date : 01-04-1989 End Date : 30-03-1992

Objectif
The objectives of the project to evaluate the pathology of the sorghum shoot disease complex with regard to yield loss potential, pathogenic variability and interaction of other foliar pathogens with Colletotrichum graminicola. Six fungal pathogens have been highlighted for study, anthracnose- Colletotrichum graminicola, grey leaf spot - Cercospora sorghi, Sooty stripe - Ramulispora sorghi, zonate leaf spot - Gloecercospora sorghi, rough leaf spot - Ascochyta sorghi, and oval leaf spot - Ramulispora sorghi.

Descriptif
Pure cultures of all pathogens with exception of Ascochyta sorghi were prepared from infected plant material obtained from Tanzania, Zimbabwe, Zambia and Malawi. Experiments were conducted to elucidate the cultural characteristics of each of the pathogens. Temperature optima and media preferences were examined and conditions suitable for the growth and sporulation of each isolate in vitro determined. Pathogenicity trials were conducted with C.graminicola, R.sorghi, C.sorghi, R.sorghicola and G.sorghi. Thesuitability of using detached leaves and young ( 1 month) sorghum seedlings as indicators of susceptability/resistance were examined. Other factors including leaf age, leaf surface, humidity, temperature, inoculum type (spores or sclerotia or mycelia) and inoculum concentration. Having optimised the conditions for successful infection, detailed studies of infection process are being conducted using microscopical techniques. C.graminicola is the most important pathogen in the complex. Thus isolates showing differential virulence phenotypes will be compared to determine which factors are of importance in the host-parasite interaction. The degree of variability within the pathogen population will also be addressed. Co-inoculations will subsequently be made and synergistic/antagonistic relationships evaluated.

Total Cost to DFID : £211,464

Présentation : UKAID

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