Abstract
A new race of Cladosporium fulvum Cke., the tomato leaf mold pathogen, appeared on the tomato lines Purdue 38 and Purdue 135 in commercial greenhouses in the vicinity of Cincinnati, Ohio, in the fall of 1962. These lines incorporate from L. hirsutum the gene Cf4, which confers immunity to races 1 to 9. Greenhouse inoculations indicate that race 10 is similar to race 1 in pathogenicity against Cf1, Cf2, and Cf3. Varieties such as Vetomold, Tucker's Forcing, and Manalucie, which contain Cf2, are accordingly immune from race 10.
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