Titlebook: Bacterial Wilt Disease; Molecular and Ecolog Philippe Prior,Caitilyn Allen,John Elphinstone Book 1998 Springer-Verlag Berlin Heidelberg 199

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Population Structure of , From a Disease Nursery and Tomato Production Fields in Taiwanacterial wilt in tomato can be location-specific (Hanson et al. 1996). Whether resistance breakdown is due to environmental causes andlor genetic diversity among populations of . is largely unknown. A better understanding of . population genetics can help to explain the underlying causes of location

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Correlation of Aggressiveness with Genomic Variation in , Race 1tman and Elphinstone 1994). Breeding for resistance in tomato has generally resulted in good levels of site-specific resistance. However, breakdown of resistance has been frequently reported in tomato cultivars grown away from the original breeding areas (Grimault and Prior 1993; Hanson and Wang 199

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Efficiency of a Vacuum Infiltration Inoculation Procedure for Detecting , in Soilcting . in extracts from artificially infested field soil. Populations of 80 – 800 colony-forming-units per gram of soil produced detectable minor foliar necrosis on vacuum infiltrated tomato seedlings, whilst increased population densities in soil increased the level of foliage necrosis. The proced

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Genetic Diversity of , Race 3 in Western Europe determined by AFLP, RC-PFGE and Rep-PCRDNA digested by rare-cutting restriction enzymes (RC-PFGE) were able to separate race 3 strains in different groups, indicating that several clonal lines are present in Europe. ERIC- and BOX-PCR were less discriminative. No correlation was found between geographical origin and profiles obtained.

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