Scot C. Nelson

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The infection process of bacterial blight of anthurium was monitored with a bioluminescent strain of Xanthomonas campestris pv. dieffenbachiae. The relationship between symptom expression on infected leaves (assessed visually) and the extent of bacterial movement within tissues (evaluated by bioluminescence emission) varied among anthurium cultivars. In(More)
Scions of Acacia koa Gray (Fabaceae) were grafted onto rootstocks of A. koa, A. mangium Willd., and A. confusa Merr. using cleft or splice grafts applied to very young seedlings. This is the first report of grafting success between A. koa and any Acacia species. Acacia koa scion plants at the second true leaf stage of development were joined with the Acacia(More)
Morphological and molecular studies confirmed Paracercospora egenula as the primary cercosporoid fungus causing leaf spot of eggplant (Solanum melongena) in Hawaii. This is the first confirmed record of P. egenula in Hawaii, although it was previously reported as C. solani-melongenae, based on an interception at Oahu, Hawaii, in 1946. Another cercosporoid(More)
Xanthomonas campestris pv. campestris induces two types of symptoms, namely, black rot and blight. Black rot symptoms are V-shaped lesions and black veins on the leaf, and blight symptoms are sudden collapse of interveinal tissues following the lack of veinal necrosis at early stages of infection. These two symptoms can occur simultaneously. However, the(More)
Spatial analysis of epiphytotics is essential to develop and test hypotheses about pathogen ecology, disease dynamics, and to optimize plant disease management strategies. Data collection for spatial analysis requires substantial investment in time to depict patterns in various frames and hierarchies. We developed a new approach for spatial analysis of(More)
Genotyping-by-sequencing (GBS) was conducted on 333 Cercospora isolates collected from Beta vulgaris (sugar beet, table beet and swiss chard) in the USA and Europe. Cercospora beticola was confirmed as the species predominantly isolated from leaves with Cercospora leaf spot (CLS) symptoms. However, C. cf. flagellaris also was detected at a frequency of 3%(More)
Cercospora leaf spot (CLS), caused by Cercospora beticola, is a major disease of Beta vulgaris worldwide. No sexual stage is known for C. beticola but in its asexual form it overwinters on infected plant debris as pseudostromata, and travels short distances by rain splash-dispersed conidiospores. Cercospora beticola infects a broad range of host species and(More)
Increases in demand for fruit of Morinda citrifolia in recent years have led to commercial farming of the trees. Typically as a crop makes the transition from wild-harvested to commercial orchard, there is a concurrent effort to select more desirable varieties and to improve the crop. In order to make these selections and improve the crop, researchers must(More)
The survival of the bacterial pathogen, Xanthomonas campestris pv. campestris (Xcc), was studied in plant debris-infested soil with different matric potentials (0, −10, −30, −50, −100, −200, and −900 kPa), and on the phylloplane of crops used for rotation with cabbage. Populations of cellulolytic and proteolytic microorganisms were studied in relation to(More)