481 PB 411 GENETIC DIVERSITY FOR TOMATO RESISTANCE TO Pseudomonas solanacearum IN CATIE S PLANT INTRODUCTION COLLECTION

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  • 1 Department of Horticulture, Iowa State University, Ames, IA 50011-1100

233 tomato accessions of the Central American tomato collection maintained at CATIE and 7 commercial cultivars were evaluated for resistance to 4 virulent strains of Pseudomonas solanacearum representing race 1 biovars 1 and 3. In general biovar 3 strains wilted seedlings faster than biovar 1 strains but by 20 days post inoculation no significant differences were noted in susceptible check ratings. Highly significant differences for disease index were noted but no line with complete resistance was found. Two CATIE accessions, 17334 and 17340, were found to be as resistant as Hawaii 7998 to all 4 strains. Accessions 17345 and MIP-CH1 were resistant to 3 strains.

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