David Horton
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View article: Seasonal variation in attraction to plant volatiles by <i>Cacopsylla pyricola</i> (Foerster) (Hemiptera: Psyllidae)
Seasonal variation in attraction to plant volatiles by <i>Cacopsylla pyricola</i> (Foerster) (Hemiptera: Psyllidae) Open
Pear psylla, Cacopsylla pyricola (Foerster) (Hemiptera: Psyllidae), occurs as 2 seasonal morphotypes. Summerforms occur on pear (Pyrus communis L.; Rosales: Rosaceae) where they are a significant pest. The larger and darker winterform morp…
View article: Psyllids in Natural Habitats as Alternative Resources for Key Natural Enemies of the Pear Psyllids (Hemiptera: Psylloidea)
Psyllids in Natural Habitats as Alternative Resources for Key Natural Enemies of the Pear Psyllids (Hemiptera: Psylloidea) Open
The pear psyllids (Cacopsylla spp.; Psylloidea) comprise ~24 species of sap-feeding insects distributed in Europe, temperate Asia, and (as introductions) in the Americas. These pear-specialized insects are among the most damaging and diffi…
View article: Seasonal activity of <i>Trechnites insidiosus</i> (Hymenoptera: Encyrtidae) and its host <i>Cacopsylla pyricola</i> (Hemiptera: Psyllidae) in pear
Seasonal activity of <i>Trechnites insidiosus</i> (Hymenoptera: Encyrtidae) and its host <i>Cacopsylla pyricola</i> (Hemiptera: Psyllidae) in pear Open
Cacopsylla pyricola (Förster) (Hemiptera: Psyllidae) is the most expensive and challenging insect pest of commercial pear trees in the Pacific Northwest. Integrated pest management (IPM) programs are working toward relying more heavily on …
View article: Characterizing Substrate-Borne Vibrational Mating Signals Produced by Pear Psylla, Cacopsylla pyricola (Hemiptera: Psyllidae)
Characterizing Substrate-Borne Vibrational Mating Signals Produced by Pear Psylla, Cacopsylla pyricola (Hemiptera: Psyllidae) Open
Tactics that manipulate insect behavior are a component of many pest management strategies. Pheromone-based mating disruption is one such tactic widely used in agricultural systems, but few studies have assessed disrupting other mate commu…
View article: Diversity, biology, and management of the pear psyllids: a global look
Diversity, biology, and management of the pear psyllids: a global look Open
The pear psyllids (Cacopsylla Ossiannilsson; Hemiptera: Psylloidea: Psyllidae) are a taxonomically difficult group of at least 24 species native to the Palaearctic region. One or more species occur in most pear-growing regions, in some cas…
View article: Bacterial Endosymbionts of <i>Bactericera maculipennis</i> and Three Mitochondrial Haplotypes of <i>B. cockerelli</i> (Hemiptera: Psylloidea: Triozidae)
Bacterial Endosymbionts of <i>Bactericera maculipennis</i> and Three Mitochondrial Haplotypes of <i>B. cockerelli</i> (Hemiptera: Psylloidea: Triozidae) Open
Insects harbor bacterial endosymbionts that provide their hosts with nutritional benefit or with protection against natural enemies, plant defenses, insecticides, or abiotic stresses. We used directed sequencing of 16S rDNA to identify and…
View article: Crude Extracts and Alkaloids Derived from Ipomoea-Periglandula Symbiotic Association Cause Mortality of Asian Citrus Psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae)
Crude Extracts and Alkaloids Derived from Ipomoea-Periglandula Symbiotic Association Cause Mortality of Asian Citrus Psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae) Open
Asian citrus psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is an important economic pest of citrus crops because it vectors the causal pathogen of huanglongbing (HLB; aka citrus greening). Population suppression of D. citri with…
View article: Association of <i>Bactericera cockerelli</i> (Hemiptera: Triozidae) With the Perennial Weed <i>Physalis longifolia</i> (Solanales: Solanaceae) in the Potato-Growing Regions of Western Idaho
Association of <i>Bactericera cockerelli</i> (Hemiptera: Triozidae) With the Perennial Weed <i>Physalis longifolia</i> (Solanales: Solanaceae) in the Potato-Growing Regions of Western Idaho Open
The potato psyllid, Bactericera cockerelli (Šulc), is a major pest of potato (Solanales: Solanaceae) as a vector of ‘Candidatus Liberibacter solanacearum’ (Lso). Bactericera cockerelli colonizes potato from noncrop host plants, yet we do n…
View article: Dispersal of Bactericera cockerelli (Hemiptera: Triozidae) in relation to phenology of Lycium barbarum (Solanaceae)
Dispersal of Bactericera cockerelli (Hemiptera: Triozidae) in relation to phenology of Lycium barbarum (Solanaceae) Open
Bactericera cockerelli (Sulc) (Hemiptera: Triozidae) is a key pest of potato ( Solanum tuberosum ) and tomato ( S. lycopersicum ) in western North America. Native Lycium (Solanales: Solanaceae) in the southwestern U.S. have been known …
View article: Exotic Psyllids and Exotic Hosts: Accumulation of Nonnative Psylloidea in North America (Hemiptera)
Exotic Psyllids and Exotic Hosts: Accumulation of Nonnative Psylloidea in North America (Hemiptera) Open
The Psylloidea (Hemiptera) comprise ~4,000 species of small sap-feeding insects known as psyllids or jumping plant-lice. We summarize species composition of the nonnative psyllid fauna in North America and review detection records, current…
View article: Stylet Probing Behavior of Two <i>Bactericera</i> (Hemiptera: Psylloidea: Triozidae) Species on Host and Nonhost Plants
Stylet Probing Behavior of Two <i>Bactericera</i> (Hemiptera: Psylloidea: Triozidae) Species on Host and Nonhost Plants Open
Understanding host use by psyllids (Hemiptera: Psylloidea) benefits from comparative studies of behavior on host and nonhost plant species. While most psyllid species develop on one or a few closely related plant species, some species are …
View article: Susceptibility of <i>Physalis longifolia</i> (Solanales: Solanaceae) to <i>Bactericera cockerelli</i> (Hemiptera: Triozidae) and ‘<i>Candidatus</i> Liberibacter solanacearum’
Susceptibility of <i>Physalis longifolia</i> (Solanales: Solanaceae) to <i>Bactericera cockerelli</i> (Hemiptera: Triozidae) and ‘<i>Candidatus</i> Liberibacter solanacearum’ Open
The potato psyllid, Bactericera cockerelli (Šulc), is a major pest of potato (Solanum tuberosum L.; Solanales: Solanaceae) as a vector of ‘Candidatus Liberibacter solanacearum’, the pathogen that causes zebra chip. Management of zebra chip…
View article: Host plants and <i>Wolbachia</i> shape the population genetics of sympatric herbivore populations
Host plants and <i>Wolbachia</i> shape the population genetics of sympatric herbivore populations Open
Changing climate and land‐use practices have the potential to bring previously isolated populations of pest insects into new sympatry. This heightens the need to better understand how differing patterns of host–plant association, and uniqu…
View article: Mortality of Potato Psyllid (Hemiptera: Triozidae) on Host Clippings Inoculated With Ergot Alkaloids
Mortality of Potato Psyllid (Hemiptera: Triozidae) on Host Clippings Inoculated With Ergot Alkaloids Open
Our previous study provided correlative evidence that morning glory species harboring endophytic fungi (Periglandula) are resistant to potato psyllid [Bactericera cockerelli (Šulc)], whereas species free of fungi often allowed psyllid deve…
View article: The Artificial Sweetener, Erythritol, Has Insecticidal Properties Against Pear Psylla (Hemiptera: Psyllidae)
The Artificial Sweetener, Erythritol, Has Insecticidal Properties Against Pear Psylla (Hemiptera: Psyllidae) Open
Erythritol is a dietary sweetener that is used for low-calorie or diabetic diets. Although safe for human consumption, erythritol is lethal to certain Dipteran pests, but insecticidal effects of erythritol on phloem-feeding insects have ye…
View article: Dispersal of Bactericera cockerelli (Hemiptera: Triozidae) in relation to phenology of matrimony vine (Lycium spp.; Solanaceae)
Dispersal of Bactericera cockerelli (Hemiptera: Triozidae) in relation to phenology of matrimony vine (Lycium spp.; Solanaceae) Open
Bactericera cockerelli (Sulc) (Hemiptera: Triozidae) is a key pest of potato ( Solanum tuberosum ; Solanaceae) in western North America. Native species of Lycium (Solanales: Solanaceae) in the southwestern U.S. have been known since the…
View article: Host and Non-host ‘Whistle Stops’ for Psyllids: Molecular Gut Content Analysis by High-Throughput Sequencing Reveals Landscape-Level Movements of Psylloidea (Hemiptera)
Host and Non-host ‘Whistle Stops’ for Psyllids: Molecular Gut Content Analysis by High-Throughput Sequencing Reveals Landscape-Level Movements of Psylloidea (Hemiptera) Open
Psyllids (Hemiptera: Psylloidea) are phloem-feeding insects that tend to be highly specific in their host plants. Some species are well-known agricultural pests, often as vectors of plant pathogens. Many pest psyllids colonize agricultural…
View article: Whence and Whither the Convolvulus Psyllid? An Invasive Plant Leads to Diet and Range Expansion by a Native Insect Herbivore
Whence and Whither the Convolvulus Psyllid? An Invasive Plant Leads to Diet and Range Expansion by a Native Insect Herbivore Open
Arrival and spread of nonnative plant species can lead to changes in structure and function of the native insect fauna that include shifts in host use by native insect herbivores. Well-documented examples showing that these host shifts als…
View article: Survival and development of potato psyllid (Hemiptera: Triozidae) on Convolvulaceae: Effects of a plant-fungus symbiosis (Periglandula)
Survival and development of potato psyllid (Hemiptera: Triozidae) on Convolvulaceae: Effects of a plant-fungus symbiosis (Periglandula) Open
Plant species in the family Solanaceae are the usual hosts of potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Psylloidea: Triozidae). However, the psyllid has also been shown to develop on some species of Convolvulaceae (bindweed…
View article: Survival and development of potato psyllid (Hemiptera: Triozidae) on Convolvulaceae: effects of a plant-fungus symbiosis (<i>Periglandula</i>)
Survival and development of potato psyllid (Hemiptera: Triozidae) on Convolvulaceae: effects of a plant-fungus symbiosis (<i>Periglandula</i>) Open
Plant species in the family Solanaceae are the usual hosts of potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Psylloidea: Triozidae). However, the psyllid has also been shown to develop on some species of Convolvulaceae (bindweed…
View article: Elicitors of Host Plant Defenses Partially Suppress Cacopsylla pyricola (Hemiptera: Psyllidae) Populations Under Field Conditions
Elicitors of Host Plant Defenses Partially Suppress Cacopsylla pyricola (Hemiptera: Psyllidae) Populations Under Field Conditions Open
Defense elicitors are products that activate acquired defense responses in plants, thus rendering the plants less susceptible to attack by a broad range of pests. We demonstrated previously under laboratory conditions that foliar applicati…
View article: Assessing the Likelihood of Transmission of Candidatus Liberibacter solanacearum to Carrot by Potato Psyllid, Bactericera cockerelli (Hemiptera: Triozidae)
Assessing the Likelihood of Transmission of Candidatus Liberibacter solanacearum to Carrot by Potato Psyllid, Bactericera cockerelli (Hemiptera: Triozidae) Open
âCandidatus Liberibacter solanacearumâ (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 so…
View article: Gut Content Analysis of a Phloem-Feeding Insect,<i>Bactericera cockerelli</i>(Hemiptera: Triozidae)
Gut Content Analysis of a Phloem-Feeding Insect,<i>Bactericera cockerelli</i>(Hemiptera: Triozidae) Open
Potato psyllid, Bactericera cockerelli (Sˇulc) (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 c…
View article: Morphological and Genetic Reappraisal of the<i>Orius</i>Fauna of the Western United States (Hemiptera: Heteroptera: Anthocoridae)
Morphological and Genetic Reappraisal of the<i>Orius</i>Fauna of the Western United States (Hemiptera: Heteroptera: Anthocoridae) Open
Examination of minute pirate bugs, Orius spp. (Hemiptera: Heteroptera: Anthocoridae), from a broad geographic range in the western United States prompted a reappraisal of the taxonomic composition of the fauna native to the western United …
View article: A New Problem and Old Questions: Potato Psyllid in the Pacific Northwest
A New Problem and Old Questions: Potato Psyllid in the Pacific Northwest Open
The potato psyllid, Bactericera cockerelli (Sulc) (Hemiptera: Triozidae) is a small phloem-feeding insect that develops almost exclusively on plants within the Solanaceae (Fig. 1A). The psyllid was described in 1909 by Karel Sulc from spec…
View article: Horizontal Transmission of "Candidatus Liberibacter solanacearum" by Bactericera cockerelli (Hemiptera: Triozidae) on Convolvulus and Ipomoea (Solanales: Convolvulaceae)
Horizontal Transmission of "Candidatus Liberibacter solanacearum" by Bactericera cockerelli (Hemiptera: Triozidae) on Convolvulus and Ipomoea (Solanales: Convolvulaceae) Open
"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-l…
View article: Use of Electrical Penetration Graph Technology to Examine Transmission of ‘Candidatus Liberibacter solanacearum’ to Potato by Three Haplotypes of Potato Psyllid (Bactericera cockerelli; Hemiptera: Triozidae)
Use of Electrical Penetration Graph Technology to Examine Transmission of ‘Candidatus Liberibacter solanacearum’ to Potato by Three Haplotypes of Potato Psyllid (Bactericera cockerelli; Hemiptera: Triozidae) Open
The potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Triozidae), is a vector of the phloem-limited bacterium 'Candidatus Liberibacter solanacearum' (Lso), the putative causal agent of zebra chip disease of potato. Little is known …
View article: Relative Abundance of Carsonella ruddii (Gamma Proteobacterium) in Females and Males of Cacopsylla pyricola (Hemiptera: Psyllidae) and Bactericera cockerelli (Hemiptera: Triozidae)
Relative Abundance of Carsonella ruddii (Gamma Proteobacterium) in Females and Males of Cacopsylla pyricola (Hemiptera: Psyllidae) and Bactericera cockerelli (Hemiptera: Triozidae) Open
Carsonella ruddii (Gamma Proteobacterium) is an obligate bacterial endosymbiont of psyllids that produces essential amino acids that are lacking in the insect's diet. Accurate estimations of Carsonella populations are important to studies …