North Central Research Station, USDA Forest Service

As Project Leader for the USDA Forest Service research work unit ("Understanding and Managing Diseases in Forest Ecosystems"), I provide leadership in development of unit-level programs by staff scientists and input and/or leadership for North Central Research Station-wide, integrated research programs. I am also responsible for many administrative functions vital to the operation of the unit. As a USDA Research Plant Pathologist and Adjunct Associate Professor in the Department of Plant Pathology, I conduct studies on invasive tree pathogens and associated insects. Practical guidelines ranging from preventing introduction of invasive pathogens to management or mitigation of diseases caused by established pathogens are end 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: 1) Temporal and spatial assessments of the levels of risk posed by insect vectors of the oak wilt fungus (Ceratocystis fagacearum) to the central U.S. oak forests, 2) Temporal and spatial aspects of below-ground transmission of C. fagacearum in relation to current disease management strategies, 3) Detection of naturally occurring Phytophthora species in decline-affected and non-affected oak forests in six states of the region, and 3) Sub-surface movement and surface emissions of volatized fumigants and their effect on soil-borne pests and surface air quality.

Selected Recent Publications:

Wang, D., Fraedrich, S.W., Juzwik, J., Spokas, K., Zhang, Y., and Koskinen, W.C. 2006. Fumigant concentration distribution in forest nursery soils under water seal and plastic film after application of dazomet, metam sodium, and chloropicrin. Pest Management Science 62:263-273..

Ward, K., Juzwik, J., and Bernick, S. 2005. Efficacy of propiconazole for prophylactic and therapeutic treatment of oak wilt in red oaks, 2004. Fungicide and Nematicide Tests Volume 60:OT018.

Ambourn, A., Juzwik, J.,  and Moon, R.D. 2005. Seasonal dispersal of the oak wilt fungus by Colopterus truncatus and Carpophilus sayi in Minnesota. Plant Dis. 89:1067-1076.

Wang, D., Juzwik, J., Fraedrich, S.W., Spokas, K., Zhang, Y., and Koskinen, W.C. 2005. Atmospheric emissions of methyl isothiocyanate and chloropicrin following soil fumigation and surface containment treatment in bare-root forest nurseries. Can. J. For. Res. 35:1202-1212.

J   Juzwik, J., Skalbeck, T.C., and Neuman, M.F. 2004. Sap beetle species (Coleoptera: Nitidulidae) visiting fresh wounds on healthy oaks during spring in Minnesota. For. Sci. 50:757—764.

B  Bartelt, R.J., Kyhl, J.F., Ambourn, A.K., Juzwik, J., and Seybold, S.J. 2004. Male-produced aggregation pheromone of Carpophilus sayi, a nitidulid vector of oak wilt disease, and pheromonal comparison with C. lugubris. Agric. And For. Entomol. 6: 39-46.

J   Juzwik, J., Cook, S., Haugen, L., and Elwell, J. 2004. Oak wilt: People and Trees: a Community Approach to Management. Gen. Tech. Rep. NC-240, St. Paul, MN: U.S. Dept. Agric., For. Serv., North Central Research Station. CD ROM. V. 1.3.

C  Cohen, S.D., Shaw, III, C.G., and Juzwik, J., eds. 2004. Sudden Oak Death online symposium. April 21 ? May 12, 2003; St. Paul, MN. Gen. Tech. Rep. NC-238. St. Paul, MN: U.S. Dept. Agric., For. Serv., North Central Research Station. CD-ROM.