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Bacterial leaf blight incited by  Pseudomonas cannabina  pv.  alisalensis  ( Pca ) is a devastating disease with incidence reports worldwide and a wide host range capable of infecting all commercially valuable  Brassica  crops. With no chemical control options available, the most effective form of disease control is host plant resistance, but thus far resistant germplasm has only been identified in  Brassica juncea  L. (mustard greens). We report the first screening of  Brassica oleracea  L. var.  viridis  germplasm, including leafy green collard and collard-like accessions, for resistance to bacterial leaf blight by artificial inoculation of  Pca  in greenhouse trials. All commercial cultivars tested displayed an intermediate disease response resulting in leaf lesion development that renders the product unmarketable. Two sources of significant resistance were identified in the U.S. Department of Agriculture (USDA)  viridis  collection, which provides a valuable source of resistance alleles for collard cultivar development and introgression into other  B. oleracea  crops.

Identification of Resistance to Bacterial Leaf Blight in the U.S. Department of Agriculture Collard Collection