Abstract
P. syringae pv. tagetis was the causal agent of an apical chlorosis of sunflower, H. annuus, in Minnesota and North Dakota [USA]. No other fungal or viral pathogens were implicated. No other field crops commonly grown in the 2 states were susceptible; the host range of the pathogen apparently is limited to members of the Compositae. The bacterium was seed-transmissible. Resistance was found in several USDA [US Department of Agriculture] sunflower inbred lines.

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