A5009701853- Forest Insect Ecology and Management
- Plant Pathogens and Fungal Diseases
- Plant and Fungal Interactions Research
- Forest Ecology and Biodiversity Studies
- Yeasts and Rust Fungi Studies
- Plant Disease Management Techniques
- Plant Pathogens and Resistance
- Insect and Pesticide Research
- Horticultural and Viticultural Research
- Insect-Plant Interactions and Control
- Entomopathogenic Microorganisms in Pest Control
- Remote Sensing in Agriculture
- Insect Pest Control Strategies
- Mycorrhizal Fungi and Plant Interactions
- Plant Disease Resistance and Genetics
- Seedling growth and survival studies
- Species Distribution and Climate Change
- Fire effects on ecosystems
- Forest ecology and management
- Spectroscopy and Chemometric Analyses
- Composting and Vermicomposting Techniques
- Land Use and Ecosystem Services
- Nematode management and characterization studies
- Botany and Plant Ecology Studies
- Biosensors and Analytical Detection
Northern Research Station
2015-2024
United States Department of Agriculture
2002-2024
US Forest Service
2006-2023
University of Wisconsin–Madison
2023
North Carolina State University
2023
Animal and Plant Health Inspection Service
2018-2023
University of Tennessee at Knoxville
2023
United States Fish and Wildlife Service
2023
Planta
1992-2019
University of Minnesota
1998-2018
Tree mortality due to global change—including range expansion of invasive pests and pathogens—is a paramount threat forest ecosystems. Oak forests are among the most prevalent valuable ecosystems both ecologically economically in United States. There is increasing interest monitoring oak decline death drought wilt pathogen ( Bretziella fagacearum ). We combined anatomical ecophysiological measurements with spectroscopy at leaf, canopy, airborne levels enable differentiation drought,...
A survey of soils associated with oak species was conducted in 2003 and 2004 Indiana, Illinois, Maryland, Michigan, Minnesota, Pennsylvania, Ohio, West Virginia, Wisconsin to investigate the occurrence Phytophthora spp. Soils taken from around base healthy declining trees were flooded H2O Quercus robur leaflets used as bait for From 829 soil samples collected near trees, 21% positive spp., 55% 125 sites surveyed yielding a sp. cinnamomi most frequently isolated species, representing 69.4%...
Abstract Hyperspectral reflectance tools have been used to detect multiple pathogens in agricultural settings and single sources of infection or broad declines forest stands. However, differentiation any one disease from other tree stress is integral for stand landscape-level applications mixed species systems. We tested the ability spectral models differentiate oak wilt, a fatal oaks caused by Bretziella fagacearum ``Bretz'', among mechanisms decline. subjected greenhouse-grown seedlings...
Occurrence de differentes especes nitidulides au printemps dans les zones du Minnesota ou serait la maladie chene; presence et frequence C.f. sur coleopteres libres des masses myceliennes: importance, localisation, types, viabilite spores associes aux amas myceliens
Extensive mortality of Metrosideros polymorpha (`ōhi`a) trees has been associated with Ceratocystis spp. on Hawai`i Island and was named rapid `ōhi`a death (ROD). Both C. lukuohia huliohia have ROD, although appears to be the more important pathogen. Crown observations dissections forest either wound-inoculated with, or naturally infected by, were conducted confirm pathogenicity document patterns host colonization. In trials, one three two inoculated fungus in February August, respectively,...
Thousand cankers disease (TCD) is a new of black walnut (Juglans nigra L.) in the eastern United States. The caused by interaction aggressive bark beetle Pityophthorus juglandis Blackman and canker-forming fungus, Geosmithia morbida M. Kolarik, E. Freeland, C. Utley & Tisserat, carried beetle. Other insects also colonize TCD-symptomatic trees may carry pathogens. A trap tree survey was conducted Indiana Missouri to characterize assemblage ambrosia beetles, other weevils attracted main stems...
The Global Plant Health Assessment (GPHA) is a collective, volunteer-based effort to assemble expert opinions on plant health and disease impacts ecosystem services based published scientific evidence. GPHA considers range of forest, agricultural, urban systems worldwide. These are referred as (Ecoregion × System), i.e., selected case examples involving keystone plants in given parts the world. focuses infectious diseases pathogens, but encompasses abiotic (e.g., temperature, drought,...
Oak wilt caused by Ceratocystis fagacearum is a significant disease of Quercus spp. in the eastern United States. Early and accurate detection pathogen particularly important when control planned. Nested real-time polymerase chain reaction (PCR) methods utilizing fungal DNA extracted from sapwood drill shavings red, bur, white oak at different stages development were compared with culture-based sapwood. The was detected all (n = 3) actively wilting branches each nine red trees using three...
Nitidulids are primary vectors of the oak wilt pathogen, Ceratocystis fagacearum (Bretz) Hunt, in north-central United States. Species adult nitidulids associated with different ages fungus mats on red oaks (Quercus rubra L. and Quercus ellipsoidalis E.J. Hill) during spring east-central Minnesota were determined. The exoskeletal surfaces representative specimens assayed for presence abundance pathogen. Six species comprised 94% 2542 adults, representing at least 12 species, collected...
Hundreds of cankers caused by Ceratocystis smalleyi are associated with hickory bark beetle-attacked bitternut exhibiting rapid crown decline in the north-central and northeastern United States. Discolored sapwood colonized fungus commonly underlies cankers. Field studies were conducted to test hypothesis that C. infections cause vascular system dysfunction infected trees. Fifty inoculations made at 1.8 3.8 m height on stems healthy trees (13 28 cm diameter 1.4 height) resulted extensive...
The canker pathogen Geosmithia morbida is known to be transmitted Juglans species by the bark beetle Pityophthorus juglandis, and lead development of thousand cankers disease. In an Indiana-wide trap-tree survey ambrosia beetles weevils colonizing stressed nigra, G. was detected on three Stenomimus pallidus emerged from two trees one site. This first report in Indiana fungus insect other than P. juglandis. Accepted for publication 22 October 2014. Published 12 January 2015.
Eastern black walnut (Juglans nigra) is a highly-valued species for timber and nut production in the eastern United States. Thousand cankers disease (TCD), caused by interaction of twig beetle (Pityophthorus juglandis) canker fungus Geosmithia morbida (Tisserat et al. 2009), was first found States 2010 threat to health its native range. The recent detection G. on weevil (Stenomimus pallidus) (Juzwik 2015) led an effort determine extent which beetles other than P. juglandis acquire their...
Thousand cankers disease is caused by the coalescence of numerous Geosmithia morbida on branches and stems Juglans species, leading to branch dieback eventual tree death. The fungus sporulates in galleries walnut twig beetle (Pityophthorus juglandis), allowing for acquisition pathogen propagules its subsequent transmission other or trees following adult emergence. Recently, G. has been isolated from Xylosandrus crassiusculus Xyleborinus saxesenii collected Ohio Stenomimus pallidus Indiana....
Abstract Both Ceratocystis lukuohia and C. huliohia have been associated with Rapid ʻŌhiʻa Death (ROD), an emerging threat to ʻōhiʻa ( Metrosideros polymorpha ), a keystone forest tree species. The vascular wilt disease caused by has recently described is responsible for the widespread ROD epidemic on Hawai'i Island. However, role of in development death not clear. Artificial inoculation field‐grown dissections naturally infected, early symptomatic trees were conducted confirm pathogenicity...
Oak wilt is a lethal disease caused by the invasive fungus Bretziella fagacearum, which transmitted belowground via root grafts and aboveground sap beetles (Nitidulidae). Attempts to limit spread impact of B. fagacearum emphasize limiting harvesting pruning periods vector inactivity. However, there limited information on beetle activity periods, responses temperature, phoresy frequencies fungi. We sampled two major vectors in Wisconsin, Colopterus truncatus Carpophilus sayi, for 2 yr...
Beetles in the family Nitidulidae can transmit oak wilt fungus, Ceratocystis fagacearum, to fresh wounds on healthy trees, leading infection and disease development. Historically, nitidulid beetles have not been considered important vectors of pathogen Missouri. Studies were conducted spring 2005 2006 determine frequencies beetle species contaminated with C. fagacearum visiting red trees central Colopterus truncatus, niger, semitectus most abundant collected from only found be fagacearum. Of...
The aggregation of gold nanoparticles (AuNPs) is known to induce an enhancement localized surface plasmon resonance due the coupling plasmonic fields adjacent nanoparticles. Here we show that AuNPs also causes a significant chemiluminescence in presence luminophores. phenomenon used introduce rapid and sensitive DNA detection method does not require amplification. probes conjugated were detect target sequence specific fungus Ceratocystis fagacearum, causal agent oak wilt. hybridization with...
Abstract Many species of sap beetles have been implicated as vectors the oak wilt pathogen, (Ceratocystis fagacearum), but responsible for most aboveground transmission fungus is unknown. The abundance adult beetle inhabiting <7-day-old, artificially made wounds on healthy oaks during Apr.–June 2 years in Minnesota, and frequencies with which viable propagules fungi were present each, determined. Sap abundant created May, 1–3-day-old yielded higher numbers insects than 4–6-day-old...