Differential Resistance of Tomato Cultigens to Biovars I and III of Pseudomonas solanacearum . C. A. LOPES, Centro Nacional de Pesquisa de Hortalicas, CNPH/EMBRAPA, C.P. 0218, 70359-970, Brasilia, DF, Brazil. ALICE M. QUEZADO-SOARES, and P. E. DE MELO, Centro Nacional de Pesquisa de Hortalicas, CNPH/EMBRAPA, C.P. 0218, 70359-970, Brasilia, DF, Brazil. Plant Dis. 78:1091-1094. Accepted for publication 5 August 1994. Copyright 1994 The American Phytopathological Society. DOI: 10.1094/PD-78-1091.

The reaction of six tomato cultigens (Yoshimatsu 4-11, Rotam-4, Rodade, Hawaii 7998, CL 1131-0-0-13-0-6, and Irat L3) to Pseudomonas solanacearum biovars I and III was evaluated in a greenhouse trial. Seedlings were root-inoculated with 11 strains of biovar I and nine strains of biovar III. The plants were individually scored 15 days after inoculation for wilt severity on a scale from I (no symptoms) to 5 (dead plant). Cluster analysis grouped strains of biovar 111 in a lower virulent cluster Van those of biovar I. Yoshimatsu 4-11, Rotam-4, and Rodade had specific resistance to biovar III but not to biovar I.