Tyler Wist

Tyler Wist
Agriculture and Agri-Food Canada | AAFC · Saskatoon Research and Development Centre

MSc, PhD

About

38
Publications
7,067
Reads
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239
Citations
Additional affiliations
May 2014 - January 2016
Agriculture and Agri-Food Canada
Position
  • NSERC Visiting Fellow
Description
  • Cereal aphids and their predators and parasitoids. Plant, disease and vector dynamics of Aster yellows in crop plants. Flea beetles, cabbage loopers, and what ever comes along!
September 2007 - May 2014
University of Alberta
Position
  • PhD Student
Description
  • In Maya Evenden's Chemical Ecology lab.
September 2002 - October 2005
University of Saskatchewan
Position
  • Master's Student

Publications

Publications (38)
Article
Full-text available
Phytoplasmas are insect-vectored, difficult-to-culture bacterial pathogens that infect a variety of crop and non-crop plants, and are associated with diseases that can lead to significant yield losses in agricultural production worldwide. Phytoplasmas are currently grouped in the provisional genus ‘Candidatus Phytoplasma’, which includes 49 ‘Candid...
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...
Chapter
A variety of sensitive and specific molecular diagnostic assays has been described for detecting nucleic acids in biological samples that may harbor pathogens of interest. These methods include very rapid, isothermal nucleic acid amplification methods that can be deployed outside of the laboratory environment, such as loop-mediated isothermal DNA a...
Conference Paper
The orange wheat blossom midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), is a significant insect pest in spring wheat, Triticum aestivum L. (Poaceae). Oviposition by adult females of S. mosellana declines postanthesis compared to preanthesis. The underlying mechanisms driving this differential oviposition behavior of S. mosellana, h...
Article
Orange wheat blossom midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), has been successfully reared in the laboratory for more than 20 years in Winnipeg, Manitoba, Canada. The rearing method has been developed to the point where it efficiently produces large numbers of wheat midge continuously under laboratory conditions for use in ex...
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
The orange blossom wheat midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), is a significant pest of wheat (Triticum spp.) grown in the Northern Hemisphere. It was accidently introduced to North America over 200 years ago and has subsequently spread throughout the northern Great Plains. Since 2010, several Canadian spring wheat varieti...
Article
Full-text available
The occurrence of different color patterns in a population of a species can depend on genetic variations or plasticity to environmental conditions. Body color variation is under selection because it is involved in several ecological processes such as camouflage for prey-predator interactions or resistance to environmental variations. Among insects,...
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
Watch a presentation about this research by first author Karolina Pusz-Bochenska. Surveillance for insect-transmitted pathogens of plants involves sampling insects in the field, followed by transport of the samples to the laboratory for DNA extraction and molecular analysis. Sample transport and DNA extraction are time consuming and can delay the i...
Article
Full-text available
In agricultural areas, the climatic conditions at the northern limit of crop cultures could impact pest regulation. In this paper, we study the aphid-parasitoid-hyperparasitoid network in cereal fields around Saskatoon (SK, Canada), one of the most harsh climatic conditions for cereal crops in the world, with an extremely short growing season. We h...
Article
Full-text available
A draft genome sequence is presented for a strain of "Candidatus Phy-toplasma asteris" affecting canola plants in Saskatoon, Canada. This phytopathogenic bacterium was determined to be a 16SrI strain and features 16S rRNA-encoding gene sequence heterogeneity. P lants infected by insect-vectored phytoplasma ("Candidatus Phytoplasma spp.") feature a...
Article
Full-text available
Native corn in Mexico can be affected by maize bushy stunt disease (MBS), which can negatively impact maize-farming operations. Maize bushy stunt symptoms in native corn were linked to the presence of phytoplasmas through molecular analysis of symptomatic native corn plants in Mexico. These findings motivated a socioeconomic characterization and id...
Article
Full-text available
Volatile chemicals produced by plants mediate host location, mate-finding and oviposition behavior in insects. State-dependent response to plant cues allows for timing of foraging, mating and oviposition on ephemeral host plants or plant parts. Caloptilia fraxinella is a herbivorous specialist on the foliage of ash trees (Fraxinus). Adults are long...
Article
Full-text available
Phytoplasmas are wall-less bacteria, unculturable in vitro, and transmitted primarily by leafhoppers (Cicadellidae). Maize bushy stunt disease has been linked to phytoplasmas belonging to the16SrI-B subgroup and vectored by leafhoppers in the genus Dalbulus spp. (Hemiptera: Cicadellidae). The recent detection of maize bushy stunt affecting native c...
Article
Full-text available
Aster yellows (AY) is an important disease of Brassica crops and is caused by Candidatus Phytoplasma asteris and transmitted by the insect vector, Aster leafhopper (Macrosteles quadrilineatus). Phytoplasma-infected Aster leafhoppers were incubated at various constant and fluctuating temperatures ranging from 0 to 35 °C with the reproductive host pl...
Presentation
Full-text available
Animals can produce a range of body colors depending on their environment. Coloration polymorphism is under selection because it is involved in several ecological processes such as camouflage and prey-predators interactions. Among insects, aphids are known to produce difference body color morphs depending on their biotic and abiotic environment and...
Article
Quinoa, Chenopodium quinoa Willdenow (Amaranthaceae), cultivation has expanded beyond its historical range in South America into Europe and North America due to its high nutritional properties for human consumption. With the introduction of a crop into a novel range comes the potential for insect pest issues. Here, using traditional morphology and...
Data
Supplementary Tables from Maize bushy stunt in native corn: implications for Mexican “subsistence farmers”
Article
The preference-performance or ‘mother-knows-best’ hypothesis states that female insects choose to oviposit on a host plant that increases the performance of their offspring. This positive link between host plant choice and larval performance is especially important for leaf miners with non-motile larvae that are entirely dependent upon the oviposit...
Article
A native parasitoid, Apanteles polychrosidis, shifted hosts to exploit the invasive leaf miner, Caloptilia fraxinella, on horticultural ash, Fraxinus spp. in Edmonton, AB, Canada. A. polychrosidis has the potential to control populations of the invasive leaf miner, and parasitism rates are studied on two host plants, black ash, F. nigra, and green...
Article
Volatile organic chemicals (VOCs) are used by female moths to find host plants for oviposition and specialist moths can be highly tuned to the volatile signature of their host plant. The ash leaf-coneroller, Caloptilia fraxinella (Ely) (Lepidoptera: Gracillariidae) specializes on ash (Fraxinus spp.) (Oleaceae). Its introduction to urban forests in...
Conference Paper
Aphids reproduce through parthenogenesis and can rapidly increase their population which can lead to economic thresholds being quickly exceeded with the possibility of yield losses. Cereal aphids and their predators and parasitoids were collected and identified from cereal fields (wheat and barley) across Saskatchewan and Manitoba (2012). The major...
Article
Inflorescences (heads or capitula) of the putative self-incompatible species, purple coneflower (Echinacea angustifolia (DC) Cronq. (Asteraceae)), were visited by insects representing the Coleoptera, Diptera, Hymenoptera, and Lepidoptera, in accordance with a generalist pollination syndrome. Measurement of the effectiveness of insect species as pol...
Article
The ash leaf-cone roller, Caloptilia fraxinella (Ely) (Lepidoptera: Gracillariidae) is an introduced leaf-mining moth of horticultural ash trees (Fraxinus Linnaeus; Oleaceae) in Western Canadian Prairie cities. Here, we identify the dominant parasitoid of this leaf-mining moth as Apanteles polychrosidis Vierek (Hymenoptera: Braconidae) and document...
Conference Paper
The ash leaf-cone roller, Caloptilia fraxinella, (Lepidoptera: Gracillariidae) infests horticultural ash, Fraxinus spp., (Oleaceae) in Canadian Prairie urban forests. Black ash, F. nigra, is the host in its native range and the coneroller has formed a new association with green ash, F. pennsylvanica, during its eleven year invasion of the urban for...
Article
Full-text available
The reproductive structure of the disk florets of Echinacea pallida var. angustifolia (Asteraceae) in relation to insect pollination was investigated using light, fluorescence, and scanning electron microscopy. The study of this self-incompatible species emphasized pollen production, pollen-stigma interactions, transmitting tissue, and vasculature...
Article
Full-text available
In spite of the impressive species diversity in the Asteraceae and their widespread appeal to many generalist pollinators, floral-nectary ultrastructure in the family has rarely been investigated. To redress this, a study using Echinacea purpurea, a plant of horticultural and nutraceutical value, was undertaken. Nectar secretion of disc florets was...

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Projects

Projects (3)
Project
Determine the volatile organic compound (VOC) profiles of spring wheat varieties with various levels of wheat midge oviposition deterrence and determine the impact of pyramiding oviposition deterrence and Sm1 on the oviposition behaviour of wheat midge