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The oomycete fungus  Phytophthora capsici  Leon. is known to be a limiting factor of chile pepper ( Capsicum  spp.) production around the world. The genetics of the resistance is becoming better understood due to the specific nature of the host–pathogen interaction; i.e., all plant organs are subject to infection. This study determined whether stem blight was the same disease syndrome as root rot or foliar blight. Stem cuttings of a segregating F 2  population and testcross progeny facilitated the ability to screen for two disease syndromes concurrently. When the three disease syndromes were compared separately, the F 2  populations fit a 3R:1S ratio and the testcross progeny fit a 1R:1S ratio. When comparative studies were performed (stem vs. foliar and stem vs. root), the F 2  populations fit a 9R/R:3R/S:3S/R:1S/S ratio and the testcross fit a 1R/R:1R/S:1S/R:1S/S ratio. These ratios are consistent of a single gene controlling the resistance of each system. Therefore, Phytophthora stem blight, root rot, and foliar blight are three separate disease syndromes.

(252) Inheritance of Phytophthora Stem Blight, Root Rot, and Foliar Blight Resistance in Capsicum