Sean Michael Prager

Sean Michael Prager
University of Saskatchewan | U of S · Department of Plant Sciences

Ph.D.

About

55
Publications
7,093
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
427
Citations
Additional affiliations
January 2017 - present
University of Saskatchewan
Position
  • Professor (Assistant)
March 2012 - August 2016
University of California, Riverside
Position
  • Research Assistant
December 2011 - February 2012
Texas A&M University
Position
  • PostDoc Position
Education
September 1996 - May 2000
Clark University
Field of study
  • Biology (Ecology and Evolution)

Publications

Publications (55)
Article
Full-text available
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 vir...
Article
The increasing demand for fresh water has forced many countries to use reclaimed wastewater for agricultural purposes. This water contains pharmaceuticals and personal care products (PPCPs) that remain biologically active following passage through wastewater treatment plants. Run-off from farms and contaminated water from treatment facilities expos...
Article
Full-text available
Among the many topics of interest to ecologists studying associations between phytophagous insects and their host plants are the influence of natal host plant on future oviposition decisions and the mechanisms of generalist versus specialist host selection behavior. In this study, we examined the oviposition preferences, behavior and larval develop...
Article
Parasitoid acceptance of host individuals that differ in suitability is dynamic, varying with physiological state and experience. Female parasitoids with high egg loads and low life expectancy (i.e. time limited) are more willing to accept hosts with low suitability for progeny development than females with low egg loads and high life expectancy (i...
Article
Full-text available
Ground beetles (Coleoptera: Carabidae) are among the most prevalent biological agents in temperate agroecosystems. Numerous species function as omnivorous predators, feeding on both pests and weed seeds, yet the sensory ecology of seed perception in omnivorous carabids remains poorly understood. Here, we explore the sensory mechanisms of seed detec...
Preprint
A key question in pollination biology is that of how pollinators identify and choose foraging patches. Several approaches have been employed for this, including field studies and large greenhouse flight chambers. Most methods used to date are limited, though, by reliance on a combination of artificial flowers, large spatial scales, or lack of spati...
Article
Zebra Chip disease (ZC), associated with the plant pathogenic bacterium ‘Candidatus Liberibacter solanacearum’ (psyllaurous) (CLso), is a major threat to global potato production. In addition to yield loss, CLso infection causes discoloration in the tubers rendering them unmarketable. CLso is transmitted by the potato psyllid, Bactericera cockerell...
Article
Over the past 20 years, ash trees (Oleaceae) in parts of the western United States of America and Canada have been subject to infestations with the psyllid Psyllopsis discrepans (Flor) (Hemiptera: Psyllidae). Infested trees show a series of symptoms, including pseudogalls, canopy loss, and in many cases, tree death. This is an expensive problem for...
Article
Polyphagous insects are characterized by a broad diet comprising plant species from different taxonomic groups. Within these insects, migratory species are of particular interest, given that they encounter unpredictable environments, with abrupt spatial and temporal changes in plant availability and density. Aster leafhoppers (Hemiptera: Cicadellid...
Article
Full-text available
‘Candidatus Liberibacter’ species are associated with severe, economically important diseases. Nearly all known species are putatively insect-transmitted, specifically by psyllids. Detection of ‘Ca. Liberibacter’ in plants is complicated by their uneven distribution in host plants and largely fastidius nature. The death of black (Fraxinus nigra) an...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
Potato virus Y (PVY) and zebra chip (ZC) disease are major threats to solanaceous crop production in North America. PVY can be spread by aphid vectors and through vegetative propagation in potatoes. ZC is associated with “Candidatus Liberibacter solanacearum” (Lso), which is transmitted by the tomato/potato psyllid, Bactericera cockerelli Šulc (Hem...
Article
Full-text available
Single-cut red clover (Trifolium pratense L.) is an important forage seed crop in Western Canada due to its winter hardiness and economical value. However, infestation of lesser clover leaf weevil (Hypera nigrirostris F.) can lead to drastic yield losses (over 50%). The aim of this research was to evaluate the effectiveness of insecticides deltamet...
Article
Some plant pathogens are capable of manipulating their insect vectors and plant hosts in a way that disease transmission is enhanced. Aster leafhopper (Macrosteles quadrilineatus Forbes) (Hemiptera: Cicadellidae) is the main vector of Aster Yellows Phytoplasma (Candidatus Phytoplasma asteris) in the Canadian Prairies, which causes Aster Yellows (AY...
Article
Full-text available
Due to their nutritional value and function as soil nitrogen fixers, production of pulses has been increasing markedly in the United States, notably in the dryland areas of the Northern Plains and the Pacific Northwest United States (NP&PNW). There are several insect-transmitted viruses that are prevalent and periodically injurious to pulse crops i...
Article
Full-text available
Chemosensory proteins (CSPs) play important roles in chemosensation in insects, but their exact physiological functions remain elusive. In order to investigate the functions of CSPs in the oriental armyworm Mythimna separata, in the present study we explored expression patterns and binding characteristics of the CSP, MsepCSP8. The distinctive funct...
Data
Phylogenetic tree of MsepCSP8 with 114 CSPs sequences from other insect species.
Article
Zebra chip (ZC) disease has been a threat to the US potato industry for nearly two decades. ZC is associated with the bacteria ‘Candidatus Liberibacter solanacearum’ (Lso), which is transmitted by the potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Triozidae). ZC reduces yield and quality, due to discoloration of the tuber tissue. Symptom...
Article
Full-text available
Long-term, sustainable management of zebra chip disease of potato, caused by 'Candidatus Liberibacter solanacearum' (Lso) and vectored by potato psyllids (Bactericera cockerelli Sulc [Hemiptera: Triozidae]), requires development of cultivars resistant or tolerant to infection or capable of reducing spread or both. We examined the influence that fiv...
Article
Potato zebra chip disease (ZC), a threat to potato production in the USA, Mexico, New Zealand, and Central America, is associated with the bacterium “Candidatus Liberibacter solanacearum” (Cls) that is vectored by the potato psyllid (Bactericera cockerelli Sulc.). ZC control currently depends on insecticide applications, but sustainable control wil...
Article
Full-text available
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 (Z...
Data
Alignment between AY601890 (3,077 bp, Thao et al., 2004) and the corresponding region in the mitogenome sequence of Bactericera cockerelli (KU501214). cob = cytochrome oxidase b, nad = NADH dehydrogenase subunits, rrnL = large ribosomal RNA subunit rrnS = small ribosomal RNA subunit. Sequence codes: yellow = protein coding genes, green = rRNA genes...
Data
A: Codon usage of protein coding genes of Bactericera cockerelli, B: Paratrioza sinica, C: Cacopsylla coccinea, and D: Pachypsylla venusta. (DOCX)
Article
Full-text available
Bckground: A robust integrated pest management (IPM) program is needed to reduce the use of insecticides in controlling Helicoverpa armigera. Therefore, a two year field study was conducted to evaluate the use of alternative control measures (biochemical use) for H. armigera relative to exclusively use of chemical insecticides. The entomopathogeni...
Article
Full-text available
Potato psyllid is a pest of solanaceous plants throughout much of the western United States, including California, where it hasincreased and is now overwintering. The psyllid affects its plant hosts from direct feeding and by transmitting a plantpathogenic bacterium, Lso. Millions of dollars of damages have occurred in the U.S. potato industry, and...
Article
Full-text available
Like many insects, mosquitoes, rely on endosymbionts to grow and develop. These can be acquired from the environment. We used next generation 454 pyrosequencing to discern the whole-body microbiome of the mosquito species Culex quinquefasciatus in various larval stadia and following exposure to common pharmaceutical and personal care products (PPCP...
Article
Full-text available
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.
Article
Full-text available
Zebra chip, also known as ‘potato purple-top’ and ‘internal tuber browning’ is threatening potato production in Mexico, Central America, the United States, and New Zealand. The disease is caused by the phloem-limited ‘Candidatus Liberibacter solanacearum’ (Lso), for which potato psyllid, Bactericera cockerelli is the vector. Currently, ZC managemen...
Article
Full-text available
Facultatively social bees allow for comparisons of social and solitary behaviour under similar environmental conditions. When such bees are polymorphic within the same population it provides a special and somewhat unusual opportunity to examine factors leading to cooperative (social) behaviours where many parameters such as environment are not vari...
Article
Full-text available
The ecological theory on host plant choice by herbivores suggests that mothers should choose plants that will maximize their offspring's success. In annual host plants, physiology (and therefore host suitability) is sometimes influenced by maturity and growth stage, which may influence female choice. Potato plants were grown under greenhouse condit...
Article
Full-text available
The tomato-potato psyllid Bactericera cockerelli (Sulc) (Hemiptera: Triozidae) is a pest of many solanaceous plants, including tomato (Solanum lycopersicum L.) and potato (Solanum tuberosum L.). In tomato, feeding by nymphs is associated with "psyllid yellows." B. cockerelli also vectors "Candidatus Liberibacter psyllaurous," an infectious bacteriu...
Article
Perceived benefits of insecticidal transgenic crops include reduced usage of broad-based insecticides, and therefore lower risk to non-target organisms. Numerous studies have documented low or no direct toxicity of Bacillus thuringiensis (Bt)-derived toxins against non-target organisms, but there has been less research on (a) effects of secondary p...
Article
Full-text available
Background: Potato psyllids (Bactericera cockerelli Sulc) are a pest on solanaceous crop plants, including bell peppers. Potato psyllids vector Candidatus Liberibacter psyllaurous, but bell peppers (Capsicum annum L.) do not exhibit symptoms from infection. Potato psyllids show variation in spatial patterns and host choice with cultivar and plant...
Article
The potato psyllid, Bactericera cockerelli (Sulc), is a major concern for potato growers as it vectors the pathogen responsible for “zebra chip” disease. Current management practices of potato psyllids in commercial potato (Solanum tuberosum L.) fields are based almost exclusively on insecticide applications with as many as 6–8 applications in indi...
Conference Paper
Full-text available
Choice of host individuals by parasitoids is dynamic, varying with physiological state and experience. In particular, female parasitoids with high egg loads and low life expectancy are more willing to accept low quality hosts than females with low egg loads and high life expectancy. However, studies of dynamic acceptance behavior in parasitoids hav...
Article
1. Xylocopa virginica virginica Linnaeus is a wide-ranging species with plastic nesting behaviour that appears to represent an intermediary between solitary and social nesting species. Over 3 years, a natural population was studied with the objective of quantifying the relationship among population dynamics, climate, female nest provisioning behavi...
Article
Development of effective management practices for insect pests relies heavily on sampling methods to accurately detect and quantify emerging populations. Herein we describe a novel method to extract and count nymphs of potato psyllid, Bactericera cockerelli (Sulc) (Hemiptera: Triozidae), from leaves in commercial fields of potato, Solanum tuberosum...
Article
Full-text available
The large carpenter bees nest in reeds, stems and wood. Many other Hymenoptera, including many wasps and some bees, have strong associations between the physical elements of their nests and behavior. Nests of the North American carpenter bee, Xylocopa virginica, were collected in southern Ontario. Nest architecture elements were examined with respe...
Article
Full-text available
In bees, both body size and shape may show considerable variation associated with differences between females and males, among populations, and due to local environmental variation. We studied multiple parameters of body size and shape of the large carpenter bee Xylocopa virginica, to understand how body size and shape are influenced by sex, and by...
Article
Full-text available
In bees, both body size and shape may show considerable variation associated with differences between females and males, among populations, and due to local environmental variation. We studied multiple parameters of body size and shape of the large carpenter bee Xylocopa virginica, to understand how body size and shape are influenced by sex, and by...
Article
Full-text available
Large-scale insect collecting efforts that are facilitated by the use of pan traps result in large numbers of specimens being collected. Storage of these specimens can be problematic if space and equipment are limited. In this study, we investigated the effects of various preservatives (alcohol solutions and DMSO) on the amount and quality of DNA e...
Article
Full-text available
Large carpenter bees (Hymenoptera: Apidae: Xylocopa) have traditionally been thought of as exhibiting solitary or occasionally communal colony social organization. However, studies have demonstrated more complex fonns of social behaviour in this genus. In this document, I examine elements ofbehaviour and life history in a North American species at...

Network

Cited By