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Inheritance of Resistance to Corynebacterium michiganense in Tomato. B. D. Thyr, Research Plant Pathologist, ARS, USDA, Plant Soil and Water division, University of Nevada, Reno 89507; Phytopathology 66:1116-1119. Accepted for publication 16 March 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-1116.

Parent clones, first and second filial generations, and backcross generations from six tomato crosses were tested for resistance to Corynebacterium michiganense. Three sources of resistance used in the crosses were Lycopersicon esculentum (Bulgaria 12, P. I. 330727), and L. pimpinellifolium (Utah 737, P. I. 344103, and Utah 20, P. I. 344102). Seedling tomatoes were inoculated in the 3-leaf stage and evaluated 5 weeks later, by measurement of internal vascular discoloration. Resistance appears to be controlled by several quantitative or incompletely dominant major genes that are influenced by modifying genes.

Additional keywords: Lycopersicon glandulosum, L. hirsutum, L. peruvianum, stunting, wilt, internal vascular discoloration.