In vitro testing of biological control agents on A1 and A2 isolates of Phytophthora ramorum

Abstract

Biological control products were tested in vitro with six isolates of Phytophthora ramorum. These isolates were geographically diverse and were selected based on their pathogenicity to detached Rhododendron leaves. In addition to five commercially available biocontrol products, nine species of Trichoderma were tested. The in vitro tests included dual culture methods and detached Rhododendron leaf assays. Best results were obtained with the actinomycete Streptomyces lydicus (Actinovate®) in both culture and detached leaf tests. There were differences among P. ramorum isolates in their sensitivity to the biocontrol agents tested.

Parent Publication

• Proceedings of the sudden oak death third science symposium

Citation

Elliott, Marianne; Shamoun, Simon. 2008. In vitro testing of biological control agents on A1 and A2 isolates of Phytophthora ramorum. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 351-354