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Inheritance of Resistance to Cucumber Mosaic Virus in Melons. Z. Karchi, Plant Breeder and Technician, Agricultural Research Organization, Division of Vegetable Crops, Newe Ya’ar Exp. Sta., Israel; S. Cohen(2) and Anneke Govers(3). (2)Virologist, Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; (3)Technician, Agricultural Research Organization, Division of Vegetable Crops, Newe Ya’ar Exp. Sta., Israel. Phytopathology 65:479-481. Accepted for publication 13 November 1974. DOI: 10.1094/Phyto-65-479.

Inheritance of resistance to cucumber mosaic virus (CMV) in melons was studied in F₁, F₂ and BC₁ progenies derived from a cross between a line of the resistant melon cultivar Freeman’s Cucumber and the susceptible honeydew cultivar Noy-Amid. Data obtained indicate that resistance is controlled by three recessive factors. The wide range of degrees of mosaic symptoms, of which the susceptible class was composed, might be explained by the various combinations of the dominant factors. Virus concentration was significantly lower in the resistant than in the susceptible parent, and that of the F₁ hybrid was intermediate, indicating incomplete dominance of susceptibility.