Liefting, L. W.


Publications
6

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 the Detection of ‘Candidatus Liberibacter’ Species in Zebra Chip Disease-Infected Potato Plants in the United States

Citation
Abad et al. (2009). Plant Disease 93 (1)
Names
Liberibacter
Abstract
Zebra chip (ZC), an emerging disease causing economic losses to the potato chip industry, has been reported since the early 1990s in Central America and Mexico and in Texas during 2000 (4). ZC was subsequently found in Nebraska, Colorado, New Mexico, Arizona, Nevada, California, and Kansas (3). Severe losses to potato crops were reported in the last few years in Mexico, Guatemala, and Texas (4). Foliar symptoms include purple top, shortened internodes, small leaves, enlargement of the stems, sw

A New ‘Candidatus Liberibacter’ Species in Solanum betaceum (Tamarillo) and Physalis peruviana (Cape Gooseberry) in New Zealand

Citation
Liefting et al. (2008). Plant Disease 92 (11)
Names
Liberibacter
Abstract
A new ‘Candidatus Liberibacter’ species was recently identified in tomato, capsicum, and potato in New Zealand. The tomato/potato psyllid, Bactericera cockerelli, is thought to be the vector of this species of liberibacter. During studies to determine additional host plants of the pathogen, leaves of Solanum betaceum (tamarillo, also known as tree tomato) and leaves and stems of Physalis peruviana (cape gooseberry) were collected from a home garden in South Auckland, New Zealand in July of 2008

A New ‘Candidatus Liberibacter’ Species in Solanum tuberosum in New Zealand

Citation
Liefting et al. (2008). Plant Disease 92 (10)
Names
Liberibacter
Abstract
Symptoms resembling “zebra chip” disease (3) were observed in potato (Solanum tuberosum) tubers harvested from a breeding trial in South Auckland, New Zealand in May 2008. The tubers had necrotic flecking and streaking that became marked when the potatoes were fried. Affected plants generally senesced early, at the beginning of April. The mean yield was approximately 60% less than expected and harvested tubers had less dry matter (13%) than normal (19%). Large numbers of the psyllid Bactericera