Surveys on Clavibacter michiganensis subsp. michiganensis, Pseudomonas corrugata and Ralstonia solanacearum in Tanzania
In 1997/1998, surveys carried out on solanaceous crops in southern and northern regions of mainland Tanzania and Zanzibar showed the presence of three wilt pathogens: Clavibacter michiganensis subsp. michiganensis (EPPO A2 quarantine pest), Pseudomonas corrugata and Ralstonia solanacearum (EPPO A2 quarantine pest). The EPPO Secretariat had previously no data on the occurrence of C. michiganensis subsp. michiganensis in Tanzania. The bacterium was isolated from wilting tomato plants in the southern highlands in Lushoto district (Tanga region, north). In addition, it was found in several sources of seeds (farmer-saved seeds and seeds extracted from diseased plants).
In 1998, Ralstonia solanacearum was detected for the first time in Zanzibar on tomato and aubergine. It was also detected in other studied regions of Tanzania. In tomatoes, only biovar 3 was detected. On potatoes, biovar 3 was found in mid-altitude fields and biovar 2 (race 3) was found only at altitudes above 1,500 m.
Sources
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Black, R.; Seal, S. Abubakar, Z.; Nono-Womdim, R.; Swai, I. (1999) Wilt pathogens of Solanaceae in Tanzania: Clavibacter michiganensis subsp. michiganensis, Pseudomonas corrugata and Ralstonia solanacearum.
Plant Disease, 83(11), p 1070.
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