Publications

movement of bactericera cockerelli (heteroptera: psyllidae) in relation to potato canopy structure, and effects on potato tuber weights.	with the threat of new plant diseases on the increase, plant disease epidemiology requires research on pathogen vector movement. here, releases were performed in planted potato fields of different ages and canopy structures, located in the texas panhandle, to evaluate the range of movement of the potato psyllid bactericera cockerelli (sulc.). this insect is a known causative agent of psyllid yellows disease, and is a vector of the reported etiological agents of zebra chip disease of potato, 'can ...	2010	21061949
association of "candidatus liberibacter solanacearum" with the psyllid, trioza apicalis (hemiptera: triozidae) in europe.	the psyllid trioza apicalis förster (hemiptera: triozidae) is a serious pest of carrots, daucus carota l., in europe. carrots exhibiting symptoms of psyllid damage were observed in commercial fields in southern finland in 2008. symptoms in affected plants included leaf curling, yellow and purple discoloration of leaves, stunted growth of shoots and roots, and proliferation of secondary roots. mechanisms by which t. apicalis induces symptoms in plants are not understood, and no plant pathogens ha ...	2010	20857712
effects of liberibacter-infective bactericera cockerelli (hemiptera: triozidae) density on zebra chip potato disease incidence, potato yield, and tuber processing quality.	in plant pathosystems involving insect vectors, disease spread, incidence, and severity often depend on the density of the vector population and its rate of infectivity with the disease pathogen. the potato psyllid, bactericera cockerelli (sulc), has recently been associated with zebra chip (zc), an emerging and economically important disease of potato in the united states, mexico, central america, and new zealand. "candidatus liberibacter solanacearum," a previously undescribed species of liber ...	2011	22299337
Vector transmission efficiency of liberibacter by Bactericera cockerelli (Hemiptera: Triozidae) in zebra chip potato disease: effects of psyllid life stage and inoculation access period.	Successful transmission of plant pathogens by insects depends on the vector inoculation efficiency and how rapidly the insect can effectively transmit the pathogen to the host plant. The potato psyllid, Bactericera cockerelli (Sulc), has recently been found to transmit "Candidatus Liberibacter solanacearum," a bacterium associated with zebra chip (ZC), an emerging and economically important disease of potato in several parts of the world. Currently, little is known about the epidemiology of ZC a ...	2011	22066176
repellency of a kaolin particle film to potato psyllid, bactericera cockerelli (hemiptera: psyllidae), on tomato under laboratory and field conditions.	the potato psyllid, bactericera cockerelli, is a vector of candidatus liberibacter solanacearum, causing several diseases in solanaceous crops. laboratory and field no-choice and choice experiments were conducted to evaluate the repellency of kaolin particle film on adults of b. cockerelli on tomato plants that had been sprayed with kaolin particle film on the upper surface only, on the lower surface only and on both leaf surfaces.	2011	21337676
diversity of endosymbionts in the potato psyllid, bactericera cockerelli (triozidae), vector of zebra chip disease of potato.	zebra chip disease is an emerging, serious disease of solanaceous crops and the causal agent is a bacterium "candidatus liberibacter solanacearum" (cls), also known as "candidatus liberibacter psyllaurous", which is transmitted by the potato psyllid, bactericera cockerelli (šulc). we performed bacterial tag-encoded flx amplicon pyrosequencing (btefap) of the 16s rdna genes to determine the bacterial microbiota in adult insects from cls-uninfected and cls-infected strains of b. cockerelli and pot ...	2011	21327558
transcriptome analyses of bactericera cockerelli adults in response to "candidatus liberibacter solanacearum" infection.	the potato/tomato psyllid, bactericera cockerelli (šulc) is an economically important crop pest that not only causes damage through its feeding but also transmits the bacterium, "candidatus liberibacter solanacearum" (cls), which causes zebra chip disease in potato. there is some information about the phenotypic effects of phytopathogenic bacteria on their insect vectors; however, there are no published reports of the molecular mechanisms underlying phytopathogenic bacteria-insect vector interac ...	2012	22945464
experimental infection of plants with an herbivore-associated bacterial endosymbiont influences herbivore host selection behavior.	although bacterial endosymbioses are common among phloeophagous herbivores, little is known regarding the effects of symbionts on herbivore host selection and population dynamics. we tested the hypothesis that plant selection and reproductive performance by a phloem-feeding herbivore (potato psyllid, bactericera cockerelli) is mediated by infection of plants with a bacterial endosymbiont. we controlled for the effects of herbivory and endosymbiont infection by exposing potato plants (solanum tub ...	2012	23166641
seasonal population dynamics of the potato psyllid (hemiptera: triozidae) and its associated pathogen "candidatus liberibacter solanacearum" in potatoes in the southern great plains of north america.	the potato psyllid, bactericera cockerelli (sulc) (hemiptera: triozidae), and its associated pathogen "candidatus liberibacter solanacearum" (ca. l. solanacearum), the putative causal agent of zebra chip (zc) disease in potatoes (solanum tuberosum l.), were sampled in commercial potato fields and untreated control plots for 3 yr in multiple locations in texas, kansas, nebraska, and colorado. populations of the potato psyllid varied across years and across potato growing regions. however, the per ...	2012	22928306
molecular and physiological properties associated with zebra complex disease in potatoes and its relation with candidatus liberibacter contents in psyllid vectors.	zebra complex (zc) disease on potatoes is associated with candidatus liberibacter solanacearum (cls), an α-proteobacterium that resides in the plant phloem and is transmitted by the potato psyllid bactericera cockerelli (šulc). the name zc originates from the brown striping in fried chips of infected tubers, but the whole plants also exhibit a variety of morphological features and symptoms for which the physiological or molecular basis are not understood. we determined that compared to healthy p ...	2012	22615987
identification and location of symbionts associated with potato psyllid (bactericera cockerelli) lifestages.	the potato psyllid (bactericera cockerelli, sulc) is an invasive pest of solenaceous plants including potatoes (solanum tuberosum l.)and tomatoes (solanum lycopersicum l.). the insect transmits the phytopathogen candidatus liberibacter solanacearum, which has been identified as the causal agent of zebra chip in potatoes. the microbiome of the potato psyllid provides knowledge of the insect's bacterial makeup which enables researchers to develop targeted biological control strategies. in this stu ...	2012	22525064
low-level detection of candidatus liberibacter solanacearum in bactericera cockerelli (hemiptera: triozidae) by 16s rrna pyrosequencing.	accurate detection and quantification of candidatus liberibacter solanacearum (cls), the putative causal agent of zebra chip disease of potato (solanum tuberosum l.), in the potato psyllid, bactericera cockerelli (sulc), has become necessary to better understand the biology of the disease cycle. studies on the transmission efficiency of potato psyllids have shown inconsistencies with field surveys. there have also been reports of laboratory colonies inexplicably losing and regaining cls infectio ...	2013	24331599
"candidatus liberibacter solanacearum" titer over time in bactericera cockerelli (hemiptera: triozidae) after acquisition from infected potato and tomato plants.	the potato psyllid, bactericera cockerelli (sulc) (hemiptera: triozidae) is a serious pest of potato and other solanaceous crops. b. cockerelli has been associated with the bacterium "candidatus liberibacter solanacearum" (lso), the causal agent of zebra chip, a new and economically important disease of potato in the united states, mexico, central america, and new zealand. the biology of liberibacter transmission to potato and other host plants by the potato psyllid is largely unknown. the curre ...	2013	24224236
methods for rapid and effective pcr-based detection of 'candidatus liberibacter solanacearum' from the insect vector bactericera cockerelli: streamlining the dna extraction/purification process.	this study provides a protocol for rapid dna isolation from psyllid vectors (bactericera cockerelli and diaphorina citri) that can be used directly with dna-based methods for the detection of 'candidatus (ca.) liberibacter solanacearum,' the bacterial causal agent of potato zebra chip disease and eventually for 'ca. liberibacter asiaticus' the causal agent of huanglongbing disease in citrus. the fast dna extraction protocol was designed to work with conventional polymerase chain reaction (cpcr) ...	2013	23865212
solanum habrochaites, a potential source of resistance against bactericera cockerelli (hemiptera: triozidae) and "candidatus liberibacter solanacearum".	the potato psyllid, bactericera cockerelli sulc, also known as tomato psyllid, is a serious pest of solanaceous plants. its host selection criteria are poorly understood. in this study, we tested whether the solanum habrochaites (pi127826), a wild solanaceous plant known for its property to repel whiteflies, was repellent to potato psyllids. using a combination of nonchoice assays and choice assays on different psyllid stages, we demonstrated that s. habrochaites is both repelling and toxic to p ...	2014	25026681
influence of the pathogen candidatus liberibacter solanacearum on tomato host plant volatiles and psyllid vector settlement.	candidatus liberibacter solanacearum (clso) is an unculturable bacterium vectored by the tomato potato psyllid (tpp) bactericera cockerelli and has been associated with zebra chip disease in potato and with other economically relevant symptoms observed in solanaceous crops. by altering their host and vector's biological system, pathogens are able to induce changes that benefit them by increasing their transmission rate. understanding these changes can enable better targeting of mechanisms to con ...	2014	25378121
correlation between "candidatus liberibacter solanacearum" infection levels and fecundity in its psyllid vector.	the potato/tomato psyllid, bactericera cockerelli (šulc) transmits the bacterium, "candidatus (ca.) liberibacter solanacearum" (lso), also known as "ca. liberibacter psyllaurous", which causes zebra chip disease in potato and other solanaceous crops. the authors previously showed that fecundity and nymph survival is significantly reduced in lso-infected psyllids compared to uninfected psyllids on tomato. however, it is not known whether the level of the pathogen is correlated with concomitant re ...	2014	24211673
latent period and transmission of "candidatus liberibacter solanacearum" by the potato psyllid bactericera cockerelli (hemiptera: triozidae).	"candidatus liberibacter solanacearum" (lso) is an economically important pathogen of solanaceous crops and the putative causal agent of zebra chip disease of potato (solanum tuberosum l.). this pathogen is transmitted to solanaceous species by the potato psyllid, bactericera cockerelli (šulc), but many aspects of the acquisition and transmission processes have yet to be elucidated. the present study was conducted to assess the interacting effects of acquisition access period, incubation period, ...	2014	24682175
comparison of potato and asian citrus psyllid adult and nymph transcriptomes identified vector transcripts with potential involvement in circulative, propagative liberibacter transmission.	the potato psyllid (pop) bactericera cockerelli (sulc) and asian citrus psyllid (acp) diaphorina citri kuwayama are the insect vectors of the fastidious plant pathogen, candidatus liberibacter solanacearum (clso) and ca. l. asiaticus (clas), respectively. clso causes zebra chip disease of potato and vein-greening in solanaceous species, whereas, clas causes citrus greening disease. the reliance on insecticides for vector management to reduce pathogen transmission has increased interest in altern ...	2014	25436509
transcriptome analysis of "candidatus liberibacter solanacearum" in its psyllid vector, bactericera cockerelli.	"candidatus liberibacter solanacearum" (lso) is an emergent pathogen of carrots in europe and solanaceous plants in north and central america and new zealand. this bacterium is closely related to other pathogenic candidatus liberibacter spp., all vectored by psyllids. in order to understand the molecular interaction of this pathogen and its psyllid vector, bactericera cockerelli, illumina sequencing of psyllid harboring lso was performed to determine if this approach could be used to assess the ...	2014	24992557
de novo genome sequence of "candidatus liberibacter solanacearum" from a single potato psyllid in california.	the draft genome sequence of "candidatus liberibacter solanacearum" strain rstm from a potato psyllid (bactericera cockerelli) in california is reported here. the rstm strain has a genome size of 1,286,787 bp, a g+c content of 35.1%, 1,211 predicted open reading frames (orfs), and 43 rna genes.	2015	26679599
indirect effects of one plant pathogen on the transmission of a second pathogen and the behavior of its potato psyllid vector.	plant pathogens can influence the behavior and performance of insect herbivores. studies of these associations typically focus on tripartite interactions between a plant host, a plant pathogen, and its insect vector. an unrelated herbivore or pathogen might influence such interactions. this study used a model system consisting of tobacco mosaic virus (tmv), the psyllid bactericera cockerelli sulc, and tomatoes to investigate multipartite interactions among a pathogen, a nonvector, and a plant ho ...	2015	26314051
loop-mediated isothermal amplification procedure (lamp) for detection of the potato zebra chip pathogen "candidatus liberibacter solanacearum".	an efficient loop-mediated isothermal amplification procedure (lamp) for the detection of "candidatus liberibacter solanacearum" (lso), the bacterial causal agent of potato zebra chip (zc) disease, is described in this chapter. similar to the polymerase chain reaction (pcr), the lamp employs a bacterial polymerase to amplify specific dna sequences. however, the method differs from conventional pcr in that it uses six primers specific to the target region to generate a loop structure and autocycl ...	2015	25981248
a predictive degree day model for the development of bactericera cockerelli (hemiptera: triozidae) infesting solanum tuberosum.	bactericera cockerelli (sulc) (hemiptera: triozidae) is a pest of potato (solanum tuberosum l.) that vectors the bacterium that putatively causes zebra chip disease in potatoes, 'candidatus liberibacter solanacearum.' zebra chip disease is managed by controlling populations of b. cockerelli in commercial potato fields. lacking an integrated pest management strategy, growers have resorted to an intensive chemical control program that may be leading to insecticide-resistant b. cockerelli populatio ...	2015	26314066
settling and ovipositional behavior of bactericera cockerelli (hemiptera: triozidae) on solanaceous hosts under field and laboratory conditions.	potato psyllid, bactericera cockerelli (šulc), is a seasonal insect pest in the lower rio grande valley of texas, where it transmits the bacterial pathogen "candidatus liberibacter solanacearum" that causes zebra chip disease of potato. studies were conducted to evaluate host preference of b. cockerelli adults for different plant species, and plant size and density. settling and oviposition behavior of b. cockerelli was studied on its wild and cultivated solanaceous hosts, including potato, toma ...	2015	26470210
horizontal transmission of "candidatus liberibacter solanacearum" by bactericera cockerelli (hemiptera: triozidae) on convolvulus and ipomoea (solanales: convolvulaceae).	"candidatus liberibacter solanacearum" (proteobacteria) is an important pathogen of solanaceous crops (solanales: solanaceae) in north america and new zealand, and is the putative causal agent of zebra chip disease of potato. this phloem-limited pathogen is transmitted to potato and other solanaceous plants by the potato psyllid, bactericera cockerelli (hemiptera: triozidae). while some plants in the convolvulaceae (solanales) are also known hosts for b. cockerelli, previous efforts to detect li ...	2015	26555359
assessing the likelihood of transmission of candidatus liberibacter solanacearum to carrot by potato psyllid, bactericera cockerelli (hemiptera: triozidae).	'candidatus liberibacter solanacearum' (lso) is a phloem-limited bacterium that severely affects important solanaceae and apiaceae crops, including potato, tomato, pepper, tobacco, carrot and celery. this bacterium is transmitted to solanaceous species by potato psyllid, bactericera cockerelli, and to apiaceae by carrot psyllids, including trioza apicalis and bactericera trigonica. five haplotypes of lso have so far been described, two are associated with solanaceous species and potato psyllids, ...	2016	27525703
interactions "candidatus liberibacter solanacearum"-bactericera cockerelli: haplotype effect on vector fitness and gene expression analyses.	"candidatus liberibacter solanacearum" (lso) has emerged as a serious threat world-wide. five lso haplotypes have been identified so far. haplotypes a and b are present in the americas and/or new zealand, where they are vectored to solanaceous plants by the potato psyllid, bactericera cockerelli (šulc) (hemiptera: triozidae). the fastidious nature of these pathogens has hindered the study of the interactions with their eukaryotic hosts (vector and plant). to understand the strategies used by the ...	2016	27376032
gut content analysis of a phloem-feeding insect, bactericera cockerelli (hemiptera: triozidae).	potato psyllid, bactericera cockerelli (šulc) (hemiptera: triozidae), is a key pest of potato (solanum tuberosum l., solanales: solanaceae) and a vector of "candidatus liberibacter solanacearum," the pathogen associated with zebra chip disease. in addition to its presence on cultivated crops, the psyllid regularly occurs on numerous uncultivated annual and perennial species within the solanaceae. a better understanding of landscape-level ecology of b. cockerelli would substantially improve our a ...	2016	27271944
the complete mitochondrial genome sequence of bactericera cockerelli and comparison with three other psylloidea species.	potato psyllid (bactericera cockerelli) is an important pest of potato, tomato and pepper. not only could a toxin secreted by nymphs results in serious phytotoxemia in some host plants, but also over the past few years b. cockerelli was shown to transmit "candidatus liberibacter solanacearum", the putative bacterial pathogen of potato zebra chip (zc) disease, to potato and tomato. zc has caused devastating losses to potato production in the western u.s., mexico, and elsewhere. new knowledge of t ...	2016	27227976
museum specimen data reveal emergence of a plant disease may be linked to increases in the insect vector population.	the emergence rate of new plant diseases is increasing due to novel introductions, climate change, and changes in vector populations, posing risks to agricultural sustainability. assessing and managing future disease risks depends on understanding the causes of contemporary and historical emergence events. since the mid-1990s, potato growers in the western united states, mexico, and central america have experienced severe yield loss from zebra chip disease and have responded by increasing insect ...	2017	28459124
"candidatus liberibacter solanacearum" associated with the psyllid, bactericera maculipennis (hemiptera: triozidae).	the psyllid bactericera maculipennis (crawford) (hemiptera: triozidae) often cohabits field bindweed (convolvulus arvensis, solanales: convolvulaceae) and other plants with the congeneric psyllid, bactericera cockerelli (šulc), in the pacific northwestern united states. bactericera cockerelli is a vector of "candidatus liberibacter solanacearum," the pathogen associated with zebra chip disease of potato (solanales: solanaceae). because b. maculipennis and b. cockerelli both naturally occur on ce ...	2017	28108600