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Thirty-two tomato ( Lycopersicon esculentum  Mill.) or  L. pimpinellifolium  (L.) Mill. accessions were inoculated with race T2 of  Xanthomonas campestris  pv.  vesicatoria  (Xcv) in a field experiment at Wooster, Ohio, in 1995. Plants from accessions which segregated for race T2 resistance in greenhouse tests were selected and these are designated by hyphenated extensions below. The eight most resistant accessions from 1995 and PI 262173 were retested in 1996.  Lycopersicon esculentum  accession PI 114490-1-1 had virtually no Xcv symptoms either year.  Lycopersicon pimpinellifolium  accessions LA 442-1-Bk and PI 128216-T2 expressed a high level of resistance in 1995, but only partial resistance in 1996. Accessions with partial resistance for both seasons were PI 79532-S1, PI 155372-S1, PI 126428, PI 271385, PI 195002, PI 262173, Hawaii 7998, and Hawaii 7983. PI 79532-S1 is a  L. pimpinellifolium  accession and the remaining seven are  L. esculentum.  Twenty accessions tested in 1995 for T2 plus 10 other accessions were also tested for race T1 resistance in Presidente Prudente, Sao Paulo, Brazil, in 1993. Hawaii 7983, PI 155372-S1, PI 114490, PI 114490-S1, and PI 262173 had greater resistance to T1 than the susceptible control, `Solar Set'. Comparisons with earlier experiments, in which accessions were inoculated with race T1 or T3, indicated that the most consistent source of resistance to all three races was PI 114490 or selections derived from it.

Resistance to Race T2 of the Bacterial Spot Pathogen in Tomato