Agronomy and Crop Science


Publications
763

First Report of “Candidatus Liberibacter psyllaurous” Associated with Psyllid Yellows of Tomato in Colorado

Citation
McKenzie, Shatters (2009). Plant Disease 93 (10)
Names
Ca. Liberibacter psyllaurous
Abstract
Greenhouse tomato growers from Fort Lupton, CO contacted the USDA-ARS-USHRL in 2002 regarding plant symptoms resembling “psyllid yellows” associated with Bactericera cockerelli (Sulc) infestations that initially begin as retarded growth, erectness of new growth, chlorosis, and purpling of leaves followed by widespread chlorosis and production of many small, poor-quality fruit (1). Symptoms appeared ≈6 weeks after psyllids were observed and were generally restricted to the top half of the plant.

First Report of ‘Candidatus Phytoplasma australiense’ in Potato

Citation
Liefting et al. (2009). Plant Disease 93 (9)
Names
Ca. Phytoplasma australiense
Abstract
In January of 2009, potato plants (Solanum tuberosum) from a commercial crop in the Waikato Region, New Zealand were observed to have symptoms of upward rolling and purpling of the leaves. The symptoms appeared similar to those of “zebra chip”, a disorder of potato recently found to be associated with ‘Candidatus Liberibacter solanacearum’ in New Zealand and the United States (4). Total DNA from the leaf midveins and tubers from one of the symptomatic plants was separately extracted with an Inv

Association of ‘Candidatus Liberibacter solanacearum’ with Zebra Chip Disease of Potato Established by Graft and Psyllid Transmission, Electron Microscopy, and PCR

Citation
Secor et al. (2009). Plant Disease 93 (6)
Names
“Liberibacter solanacearum”
Abstract
A new disease of potatoes, tentatively named zebra chip (ZC) because of the intermittent dark and light symptom pattern in affected tubers which is enhanced by frying, was first found in Mexico in 1994 and in the southwestern United States in 2000. The disease can cause severe economic losses in all market classes of potatoes. The cause of ZC has been elusive, and only recently has been associated with ‘Candidatus Liberibacter’ sp. Field samples of potato plants were collected from several loca

First Report of ‘Candidatus Liberibacter asiaticus’ Associated with Citrus Huanglongbing in the Dominican Republic

Citation
Matos et al. (2009). Plant Disease 93 (6)
Names
Ca. Liberibacter asiaticus
Abstract
In August 2008, unusual symptoms were observed in Mexican lime trees (Citrus aurantifolia (Christm.) Swing) in the municipality of Luperón, province of Puerto Plata on the north coast of the Dominican Republic. Symptoms observed in young and old trees included blotchy mottle on leaves, healthy-appearing larger branches with smaller side branches that displayed chlorotic leaves, abscised and lopsided fruit, and branch dieback, all symptoms similar to those of citrus huanglongbing associated with

First Report of Aster Yellow Phytoplasmas (‘Candidatus Phytoplasma asteris’) in Canadian Grapevines

Citation
Olivier et al. (2009). Plant Disease 93 (6)
Names
Ca. Phytoplasma asteris
Abstract
In North America, elm yellows, aster yellows (AY), and X-disease phytoplasmas have been detected in American grapevines (1), and recently, Bois noir was detected in Canadian vineyards from British Columbia (BC) and Ontario (ON) (2). Typical symptoms of grapevine yellows (GY) include leaf rolling and chlorosis, uneven or total lack of lignification of canes, flower abortion or berry withering, and stunting. In 2006 and 2007, independent surveys were conducted by the Canadian Food Inspection Agen

First Report of ‘Candidatus Liberibacter psyllaurous’ in Potato Tubers with Zebra Chip Disease in Mexico

Citation
Munyaneza et al. (2009). Plant Disease 93 (5)
Names
Ca. Liberibacter psyllaurous
Abstract
Zebra Chip (ZC), an emerging disease of potato (Solanum tuberosum L.) first documented in potato fields around Saltillo in México in 1994, has been identified in the southwestern United States, México, and Central America and is causing losses of millions of dollars to the potato industry (4). Recently, this damaging potato disease was also documented in New Zealand (3). This disease is characterized by a striped pattern of necrosis in tubers produced on infected plants, and fried chips process

First Report of ‘Candidatus Liberibacter psyllaurous’ in Zebra Chip Symptomatic Potatoes from California

Citation
Crosslin, Bester (2009). Plant Disease 93 (5)
Names
Ca. Liberibacter psyllaurous
Abstract
A disease that severely affects processing potatoes (Solanum tuberosum L.), termed zebra chip (ZC), has been identified in several locations in the United States (Texas, Nebraska, Colorado, Kansas, New Mexico, Arizona, and Nevada), Mexico, and Central America (4). The disease name comes from the rapid oxidative darkening of freshly cut tubers and the dark stripes and blotches that occur in chips processed from infected tubers. Recently, the disorder has been associated with a new ‘Candidatus Li