SCREENING TOMATO ACCESSIONS FOR RESISTANCE TO XANTHOMONAS-CAMPESTRIS PV VESICATORIA, RACE T3

Tomato (Lycopersicon esculentum Mill.) accessions were tested for hype rsensitivity and rated for resistance following field inoculation with tomato race 3 (T3) of the bacterial spot pathogen Xanthomonas campest ris pv. vesicatoria (Doidge) Dye (Xcv) in 1992 and 1993. Hawaii 7981, PI 126932, PI 128216, and selections of the latter two expressed hyper sensitivity. Hawaii 7981, only tested in the field in 1993, was nearly symptomless and developed significantly less disease than any other a ccession. PI 128216 had a level of disease similar to susceptible 'Sol ar Set' when tested in 1993. However, a selection from it (PI 126218-S ) was significantly more resistant than 'Solar Set' in both years. Alt hough PI 126932 had a level of disease similar to 'Solar Set' in both years, a selection from it (PI 126932-1-2) was significantly more resi stant than 'Solar Set' in 1993. Other accessions without hypersensitiv e responses but more resistant than 'Solar Set' for two seasons were P I 114490, PI 126428, PI 340905-S, and PI 155372. Hawaii 7975 was signi ficantly more resistant than 'Solar Set' in the one season it was test ed.