Cucumber Germplasm Resistant to Cladosporium cucumerinum

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  • 1 Department of Horticulture, 1575 Linden Drive, University of Wisconsin, Madison, WI 53706
  • 2 Vegetable Crops Unit, Agricultural Research Service, U.S. Department of Agriculture, Department of Horticulture, 1575 Linden Drive, University of Wisconsin, Madison, WI 53706

Scab (caused by Cladosporium cucumerinum Ell. & Arth.) is an important disease of cucumber (Cucumis sativus L.), and the only source of resistance traces back to the cultivar Maine No. 2. We inoculated hypocotyls of 188 cucumber accessions with one strain of the scab fungus to identify other sources of scab resistance. Accessions NSL5731, 255933, 264666, 264667, 306785, 342951, 354952, 458845, and 535881 showed no symptoms. Plants in accession 525075 showed a continuous phenotypic distribution for reaction to scab; all other accessions were susceptible.

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