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Inheritance of Resistance in Tomato to Target Leaf Spot. F. A. Bliss, Associate Professor, Department of Horticulture, University of Wisconsin, Madison; P. T. Onesirosan(2), and D. C. Arny(3). (2)(3)Research Assistant and Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 63:837-840. Accepted for publication 7 January 1973. DOI: 10.1094/Phyto-63-837.

A method for evaluating tomato seedlings for reaction to Corynespora cassiicola, which incites target leaf spot, was developed. Useful levels of seedling resistance were found in P.I. 120265 (Lycopersicon esculentum) from Turkey and P.I. 112215 (L. pimpinellifolium) from Ecuador. When each line was crossed with the susceptible cultivar ‘Ife No. 1’, the F1 and F2 and backcross progenies indicated that resistance was controlled by a single recessive gene. The F1 and F2 progenies from the cross of P.I. 120265 × P.I. 112215 were uniformly highly resistant, suggesting that the gene for resistance was the same in both. Twelve additional introductions showed slight resistance and 228 introductions were highly susceptible.

Additional keywords: rapid defoliation, conidia.