Evaluation of fungicides for use against P. ramorum
The Forest Service, Washington State Pesticide Commission, Pacific Northwest Christmas Tree Association, IR-4 program, and the WSDA Nursery Research Program are supporting research at WSU Puyallup to determine the effectiveness of various fungicides in protecting conifers and rhododendrons from infection by this pathogen. This work has shown that several traditional contact materials, such as mancozeb, and the systemic material Subdue MAXX, have the potential to provide excellent control of diseases caused by P. ramorum. However, growers and regulatory agencies are concerned that the use of fungicides may be masking symptom development, thus making it harder to prevent the spread of this pathogen on infected nursery stock. Now that the new biocontainment facility is completed at WSU Puyallup, additional studies will be conducted to determine the residual effectiveness of fungicides and determine if any of them have the potential to mask symptom development on infected plants.
Publications
Cristi Palmer and Ely Vea. 2006. IR-4 Ornamental Horticulture Program Phytophthora Efficacy.
Chastagner, G.A., E.M. Hansen, K.L. Riley, and W. Sutton. 2005. Effectiveness of fungicides in protecting Douglas-fir shoots from infection by Phytophthora ramorum. Sudden Oak Death Science Symposium II, 18-21 January 2005, Monterey, CA.
Chastagner, G.A., E.M. Hansen, K.L. Riley, and W. Sutton. 2004. Effectiveness of fungicides in protecting Douglas-fir shoots from infection by Phytophthora ramorum. Phytopathology 94: S16.
Chastagner, G.A., E.M. Hansen. 2003. Identification of fungicides to control sudden oak death. Christmas Tree Lookout 36(3): 7-9.
Chastagner, G.A., E.M. Hansen, K.L. Riley, and W. Sutton. 2003. Identification of fungicides to control sudden oak death. In: Program and abstract book, sixth international Christmas tree research and extension conference; 2003 Sept. 14-19; Hendersonville, NC; 36.