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Inheritance of resistance to zucchini yellow mosaic virus-Florida strain (ZYMV-FL) was studied in the resistant watermelon accession of PI 595203 ( Citrulluslanatus  var.  lanatus ), an egusi type originally collected in Nigeria. The F 1 , F 2 , and BC 1  generations derived from the cross `Calhoun Gray' × PI 595203 and `New Hampshire Midget' × PI 595203 were used to study the inheritance of resistance to ZYMV-FL. Seedlings were inoculated with a severe isolate of ZYMV-FL at the first true leaf stage and rated on a 0 to 9 scale, based on the severity of virus symptoms. A single recessive gene was found to control resistance, for which we propose the symbol  zym-FL2 . The gene probably was not allelic to the previously published gene,  zym-FL , for resistance to the Florida strain of ZYMV in the accession PI 482261, since PI 482261 was not resistant to the ZYMV-FL isolate used in our tests.

(11) Inheritance of Resistance to Zucchini Yellow Mosaic Virus-Florida Strain in Watermelon