Diseases of common bean in Eastern and Southern Africa
A booklet prepared by Dr D.J. Allen on diseases of common bean (Phaseolus vulgaris) in Eastern and Southern Africa has recently been published by CABI. It gives useful information on the occurrence and prevalence of these diseases and pathogens in 20 countries, and includes a comprehensive bibliography. The EPPO Secretariat has extracted data concerning quarantine diseases of common bean, which are new or detailed records.
- Burkholderia (Pseudomonas) solanacearum (EPPO A2 quarantine pest):
Recorded in: Madagascar (widely distributed and damaging, 20-50 % incidence), Mauritius (Beau Bassin), Swaziland*.
- Cowpea mild mottle 'carlavirus':
Reported in: Malawi* (Bunda near Lilongwe), Mozambique*, Sudan* (this virus disease is regarded as the most important disease of beans in Sudan especially when populations of B. tabaci are dense; widespread in the north of the country; recently found strongly associated with cowpea mild mottle 'carlavirus' but field symptoms could not be reproduced under glasshouse conditions), Tanzania (Morogoro, Lushoto, Tanga), Uganda* (Kabanyolo, Kampala).
- Curtobacterium flaccumfaciens pv. flaccumfaciens (EPPO A2 quarantine pest)
Reported in: Mauritius* (first record in Beau Bassin ; Black River in 1963, then in Mapou, Local Red). In Kenya, few isolated records had been reported from the period 1968-1973, but the disease is now presumed eradicated in this country.
- Phaeoisariopsis griseola (EPPO A2 quarantine pest)
Recorded in: Burundi*, Ethiopia (Awasa, Eritrea, Didesa, Kaffa, Shewa), Madagascar (found around Antananarivo, Bealanana and Lac Alaotra - common but regarded of minor importance), Rwanda*, South Africa (Natal, Transvaal), Sudan (occasional in Equatoria but rarely severe), Swaziland* (minor importance), Zaire (Bas Zaire, Loutu, Mulungu, Ndihira, South Kivu, North Kivu), Zambia (Central ; Eastern Provinces).
- Xanthomonas campestris pv. phaseoli (EPPO A2 quarantine pest)
Reported in: Angola* (Huambo, Chiange), Burundi*, Kenya (very common), Lesotho* (widespread), Madacasgar (found near Lac Itasy in 1932), Malawi (widespread), Mauritius* (first recorded in 1981), Rwanda*, Swaziland*, Zaire* (Bas Zaire, North Kivu).
- A whitefly-transmitted geminivirus causing golden mosaic symptoms has recently been reported from Uganda (Kabanyolo). EPPO note: for the moment, bean golden mosaic geminivirus is not specifically known to be present in Africa, however lima bean golden mosaic has been reported from Nigeria (relationships between this virus and bean golden mosaic geminivirus have not yet been fully worked out).
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* new records according to the EPPO Secretariat.
Sources
Allen, D.J. (1995) An annotated list of diseases, pathogens and associated fungi of the common bean (Phaseolus vulgaris) in Eastern and Southern Africa.
CABI, Phytopathological Papers, No. 34, 42 p.