Jennifer Juzwik
Title: Research Plant Pathologist
Unit: Biological and Environmental Influences on Forest Health and Productivity
Previous Unit: Understanding & Managing Diseases in Forest Ecosystems
Address: Northern Research Station
1561 Lindig Ave.
St. Paul, MN 55108
Phone: 651-649-5114
E-mail: Contact Jennifer Juzwik
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Education
- University of Minnesota, Ph.D., Plant Pathology, 1983
- Colorado State University, M.Sc., Plant Pathology, 1978
- Fairmont State College, B.Sc., Biology, 1976
Civic & Professional Affiliations
- American Phytopathological Society
- International Society of Arboriculture
- Minnesota Society of Arboriculture
- Northeastern Nursery Association
- Minnesota Shade Tree Advisory Committee
Current Research
As a Research Plant Pathologist, I conduct studies on invasive tree pathogens and associated insects. These studies are often conducted in collaboration with scientists, forest health specialists, and foresters in federal, state and county agencies as well as universities. Practical guidelines ranging from preventing introduction of invasive pathogens to managing or mitigating diseases caused by established pathogens are the outcomes of these studies. I also collaborate with other scientists outside the Station and region to develop effective, economical, and more environmentally benign alternatives to methyl bromide for soil fumigation in U.S. bare-root forest nurseries. My current research efforts concern:
- Hickory decline and dieback research
- Determine frequencies of decline/dieback and mortality of smooth bark hickories in appropriate forest cover types where deviations from expected levels of mortality have been observed (Indiana, Iowa, Minnesota, Ohio, New York, and Wisconsin).
- Quantify relationships between decline/dieback incidence and a) pathogen and/or insect pest presence, and b) prior land use, fire history, soils and drought.
- Determine the role of two newly described Ceratocystis species in decline/dieback and mortality of bitternut hickory.
- Oak wilt research
- Investigate temporal and spatial aspects of belowground transmission of C. fagacearum in relation to current disease management strategies. These studies include evaluation of the efficacy of propiconazole and of mechanical root graft disruption in operational, oak wilt control programs.
- Evaluate woody shrub and tree regeneration occurring in oak wilt infection centers subjected to different levels of disease management versus non-managed ones
Why is This Important
Oak-hickory forests comprise 29% of the 31 million hectares of forest land in the Upper Midwest (IL, IN, IA, MI, MN, MO and WI). The oak species group is the most important aggregation of hardwoods in the United States. Oak decline and oak wilt are responsible for much of the observed oak deterioration and mortality in the midwestern forests. In addition, new exotic pathogens, such as Phytophthora ramorum (cause of Sudden Oak Death) and Raffaelea quercivora (cause of Japanese oak wilt), are potential threats to the health of oaks in these forests. Our oak disease research addresses both the need for early detection of any unintentionally introduced exotic pathogens and for new or refined management tools for well-established pathogens, such as Ceratocystis fagacearum (cause of oak wilt in the USA).
Hickories are an important component of many forest associations in the eastern United States, particularly various oak-hickory cover types. Sites impacted by hickory decline or dieback and mortality have recently been reported to lose a high proportion of smooth bark hickories, particularly bitternut, over a very short period of time (3 to 5 years). These losses cause a significant, adverse impact to wildlife, timber value and biodiversity in affected stands. Our goal is to identify significant biotic and abiotic contributors to the decline or dieback and develop site or silvicultural guidelines for mitigating the tree losses and stand impacts associated with this problem.
Soil fumigation is commonly used in bare-root forest nurseries to manage soil-borne pests including fungal pathogens. However, bromine resulting from breakdown of methyl bromide – the most commonly used fumigant – contributes to loss of the Earth’s stratospheric ozone layer. More environmentally benign fumigants are needed for nursery soil treatment. In addition, information is needed on the potential risk of the alternative fumigants to human and non-target plant health. My research on chemical fumigants addresses these needs. The goal is to provide quality tree seedlings for reforestation in the region while minimizing negative impacts to the environment.
Future Research
I would like to develop three areas of interest into research projects in the near future:
- Quantify/determine spatial and temporal aspects of above- and belowground spread of the root and butt rot fungus Heterobasidion annosum in northern pine plantations.
- Assess potential for forest disease epidemics by selected pathogens under different climate change scenarios in the eastern United States.
- Evaluate the relative susceptibility of native US species of Quercus to the exotic, fungal pathogen Raffaelea quercivora.
Featured Publications
- Juzwik, Jennifer; Haugen, Linda; Park, Ji-Hyun; Moore, Melanie. 2008. Fungi associated with stem cankers and coincidental scolytid beetles on declining hickory in the upper midwest
- Juzwik, Jennifer; Harrington, Thomas C.; MacDonald, William L.; Appel, David N. 2008. The origin of Ceratocystis fagacearum, the oak wilt fungus
- Hayslett, Maya; Juzwik, Jennifer; Moltzan, Bruce. 2008. Three Colopterus beetle species carry the oak wilt fungus to fresh wounds on red oak in Missouri
- Kromroy, Kathryn W.; Juzwik, Jennifer; Castillo, Paul; Hansen, Mark H. 2008. Using Forest Service forest inventory and analysis data to estimate regional oak decline and oak mortality
- Schwingle, B.W.; Juzwik, J.; Eggers, J.; Moltzan, B. 2007. Phytophthora species in soils associated with declining and nondeclining oaks in Missouri forests
Additional
Online Publications
- Ward, Kathleen; Kromroy, Kathryn; Juzwik, Jennifer. 2007. Transformation of the oak forest spatial structure in the Minneapolis/St. Paul metropolitan area, Minnesota, USA over 7 years
- Seeland, T.M.; Ostry, M.E.; Venette, R.; Juzwik, J. 2006. An annotated bibliography of invasive tree pathogens Sirococcus clavigignenti-juglandacearum, Phytophthora alni, and Phytophthora quercina and a regulatory policy and management practices for invasive species
- Ambourn, Angie K.; Juzwik, Jennifer; Eggers, Jordan E. 2006. Flight periodicities, phoresy rates, and levels of Pseudopityophthorus minutissimus branch colonization in oak wilt centers
- Wang, Dong; Fraedrich, Stephen W.; Juzwik, Jennifer; Spokas, Kurt; Zhang, Yi; Koskinen, William C. 2006. Fumigant distribution in forest nursery soils
- Kromroy, Kathryn; Ward, Kathleen; Castillo, Paul; Juzwik, Jennifer. 2006. Relationships between urbanization and the oak resource of the Minneapolis/St. Paul metropolitan area from 1991 to 1998
- Wang, D.; Juzwik, J.; Fraedrich, S.W.; Spokas, K.; Zhang, Y.; Koskinen, W.C. 2005. Atmospheric emissions of methyl isothiocyanate and chloropicrin following soil fumigation and surface containment treatment in bare-root forest nurseries
- Ward, Kathleen; Juzwik, Jennifer. 2005. Change in the Minneapolis/St. Paul Metropolitan Area Oak Forests from 1991 to 1998
- Eggers, Jordan; Juzwik, Jennifer; Bernick, Shawn; Mordaunt, Lori. 2005. Evaluation of propiconazole operational treatments of oaks for oak wilt control
- Ambourn, Angie K.; Juzwik, Jennifer; Moon, Roger D. 2005. Seasonal dispersal of the oak wilt fungus by Colopterus truncatus and Carpophilus sayi in Minnesota
- Ward, K.; Juzwik, J.; Bernick, S. 2004. Efficacy of Alamo for prophylactic and therapeutic treatment of oak wilt in red oaks, 2004
- Scarbrough, Dwight; Juzwik, Jennifer. 2004. Native and exotic insects and diseases in forest ecosystems in the Hoosier-Shawnee ecological assessment area
- Juzwik, J.; Cook, S.; Haugen, L.; Elwell, J. 2004. Oak Wilt: People and Trees, A Community Approach to Management
- Juzwik, Jennifer; Skalbeck, Thomas C.; Newman, Marc F. 2004. Sap beetle species (Coleoptera: Nitidulidae) visiting fresh wounds on healthy oaks during spring in Minnesota
- Cohen, S.D.; Juzwik, J., eds. 2003. Sudden oak death online symposium
- Kromroy, Kathryn W.; Juzwik, Jennifer; Castillo, Paul D. 2003. Use of USDA forest inventory and analysis data to assess oak tree health in Minnesota
- Ocamb, C. M.; Juzwik, J.; Martin, F. B. 2002. Fusarium spp. and Pinus strobus seedlings: root disease pathogens and taxa associated with seed
- Juzwik, Jennifer; Kromroy, Kathryn; Allmaras, Raymond. 2002. Comparison of Tillage for Improving Soil Conditions and Root Health in Barefoot Nurseries
- Kyhl, John F.; Bartelt, Robert J.; Cosse, Allard; Juzwik, Jennifer; Seybold, Steven J. 2002. Semiochemical-mediated flight responses of sap beetle vectors of oak wilt, Ceratocystis fagacearum
- Cervenka, Valerie J.; Skalbeck, Thomas C.; Kyhl, John F.; Blackford, Darren C.; Juzwik, Jennifer J.; Seybold, Steven J. 2001. How to identify common nitidulid beetles associated with oak wilt mats in Minnesota
- Cease, Kory R.; Juzwik, Jennifer. 2001. Predominant nitidulid species (Coleoptera: Nitidulidae) associated with spring oak wilt mats in Minnesota
- Juzwik, Jennifer. 2000. An oak wilt primer
- Juzwik, Jennifer; Schmidt, Thomas L. 2000. Oak wilt and oak decline in the upper midwest USA
- Juzwik, J; Gust, K. M.; Allmaras, R. R. 1999. Influence of cultural practices on edaphic factors related to root disease in Pinus nursery seedlings
- Juzwik, Jennifer; Johnson, Gary. 1999. Oak Wilt in Minnesota: It's Still Here and We're Doing Something About It!
- Juzwik, Jennifer. 1999. Overland transmission of Ceratocystis fagacearum: extending our understanding
- Burnes, Todd A.; Juzwik, Jennifer; Blanchette, Robert A. 1999. Screening Pinus sylvestris grown for the production of Christmas trees for resistance to western gall rust Peridermium harknessii using different sources of aeciospores
- Juzwik, Jennifer; Cease, Kory R.; Meyer, Jason M. 1998. Acquisition of Ophiostoma quercus and Ceratocystis fagacearum by nitidulids from O. quercus-colonized oak wilt mats
- Juzwik, Jennifer; Meyer, Jason M. 1997. Colonization of oak wilt fungal mats by Ophiostoma piceae during spring in Minnesota
- Juzwik, J.; Stenlund, D. L.; Allmaras, R.R.; Copeland, S. M.; McRoberts, R. E. 1997. Incorporation of tracers and dazomet by rotary tillers and a spading machine
- Schmidt, Elmer L.; Juzwik, Jennifer; Schneider, Brian. 1997. Sulfuryl fluoride fumigation of red oak logs eradicates the oak wilt fungus
- Seybold, Steven; Juzwik, Jennifer. 1996. HOW to Identify Common Nitulid Beetles Associated with Oak Wilt Mats in Minnesota
- Juzwik, J.; Rugg, D. J. 1996. Seedling mortality and development of root rot in white pine seedlings in two bare-root nurseries
- Ocamb, Cynthia M.; Juzwik, Jennifer. 1995. Fusarium species associated with rhizosphere soil and diseased roots of eastern white pine seedlings and associated nursery soil
- Juzwik, Jennifer. 1993. Morphology, cultural characteristics, and pathogenicity of Rhizosphaera kalkhoffii on Picea spp. in northern Minnesota and Wisconsin
- Juzwik, Jennifer; O Brien, Joseph G. 1990. Premature Needle Loss of Spruce
Other Publications by Jennifer Juzwik *
- Juzwik, J.; Cummings-Carlson, J.; Scanlon, K. 2008. Risk analysis and guidelines for harvest activities in Wisconsin oak timberlands to minimize oak wilt threat. Forestry Encyclopedia. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. [online] http://www.forestryencyclopedia.net/p/p3464
*Due to policy or copyright restrictions, we are unable to provide full-text versions of these publications. Please check with your local library or Contact Jennifer Juzwik to inquire about reprints.
Last Modified:
11/19/2008