How to Manage Pests

Pests in Gardens and Landscapes

Trees and shrubs not reported to be susceptible to Phytophthora cinnamomi

Common Name Genus Name
albizia Albizia
alder Alnus
ash1 Fraxinus
California buckeye1 Aesculus
citrus2 Citrus
cotoneaster3 Cotoneaster
cottonwood Populus
coyote brush Baccharis
elm Ulmus
euonymus1 Euonymus
honey locust Gleditsia
linden Tilia
magnolia1 Magnolia
maidenhair tree Ginkgo
mayten Maytenus
oleander1 Nerium
podocarpus Podocarpus
poplar Populus
sweet gum Liquidambar
tamarisk Tamarix
toyon1, 4 Heteromeles
tulip tree Liriodendron
zelkova Zelkova

This list provides only a guideline; host vigor and environmental conditions are important in the development of root and crown rot disease. Some hosts are susceptible to other Phytophthora spp.
1. Susceptible to Ramorum blight, Phytophthora ramorum.
2. Susceptible to Phytophthora citrophthora and P. parasitica.
3. Susceptible to Phytophthora cryptogea and P. parasitica.
4. Susceptible to Phytophthora cactorum.
Sources: American Phytopathological Society. 2016. Common Names of Plant Diseases.
Farr, D. F., G. F. Bills, G. P. Chamuris, and A. Y. Rossman. 1989. Fungi on Plants and Plant Products in the United States. St. Paul, MN: American Phytopathological Society.
Ohr, H. D., G. A. Zentmyer, E. C. Pond, and L. J. Klure. 1980. Plants in California Susceptible to Phytophthora cinnamomi. Oakland: Univ. Calif. Agric. Nat. Res. Publ. 21178.
U.S. Department of Agriculture-APHIS. 2013. List of Regulated Hosts and Plants Proven or Associated with Phytophthora ramorum (PDF).

Statewide IPM Program, Agriculture and Natural Resources, University of California
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