Research – Update on Sudden Oak Death (SOD) (Dec 2002)

Host Range Update for the Causal Agent (Phytophthora ramorum) of Sudden Oak Death (SOD)

The host plant listing of the sudden oak death (SOD) pathogen (Phytophthora ramorum) has grown substantially since the first SOD alert was published two months ago.  This update summarizes the information presented at the ‘Sudden Oak Death Science Symposium’ held in Monterey, CA, December 17-18, 2002.  This updated host listing is intended to educate growers and the public and to assist in safeguarding the nursery and forest industry as well as the natural landscape and ecosystems in Virginia.

Known host plants

Acer macrophyllum – Big leaf maple
Aesculus californica – California Buckeye
Arbutus menziesii – Madrone                      
Arctostaphylos manzanita – Manzanita
Chrysolepis chrysophylla – Golden chinquapin
Heteromeles arbutifolia – Toyon                          
Lithocarpus densiflorus – Tanoak
Lonicera hispidula – California honeysuckle
Pittosporum undulatum – Victoria box
Pseudotsuga menziesii – Douglas-fir
Quercus agrifolia – Coast live oak
Quercus chrysolepsis – Canyon live oak
Quercus kelloggii – Black oak        
Quercus parvula var. shrevei – Shreve’s oak
Sequoia sempervirens – Coast redwood
Rhamnus californica – California coffeeberry
Rhamnus purshiana – Cascara           
Rhodendron macrophyllum
Rhododendron spp. – Rhododendron
Rubus spectabilis – Salmon berry
Rhus diversiloba – Poison oak
Trientalis latifolia – Western starflower
Umbellularia californica – California bay laurel
Vaccinium ovatum – Huckleberry
Viburnum ´ bodnantense – Arrowwood
Viburnum tinus

Potential host plants (susceptible when inoculated, but not yet found in nature):

Arctostaphylos uvaursi – Kinnikinnick
Camellia spp. – Camellia
Carpinus spp. – Hornbeam
Castanopsis chrysolepsis – Chinquapin
Cotoneaster spp. – Cotoneaster
Gaultheria procumbens – Wintergreen
Gaultheria shallon – Salal
Hedera spp. – Ivy
Ilex aquifolium – English holly
Kalmia latifolia – Mountain laurel
Leucothoe spp. – Leucothoe
Nandina spp. – Heavenly bamboo
Pachysandra spp. – Pachysandra
Pieris spp. – Pieris
Prunus spp. – Cherry laurel
Quercus garryana – Oregon white oak
Quercus palustris – Pin oak
Quercus petraea –
Quercus robur –
Quercus rubra – Northern red oak
Rhododendron maximum
Rhododendron ‘Cunningham’s White’
Rhododendron ‘P.J.M’
Rhododendron ‘Unique’
Rhododendron ‘Nova zembla’
Syringa spp. – Lilac
Vaccinium vistis-idaea – Lingonberry
Viburnum carlesii
Viburnum dentatum
Viburnum opulus
Zenobia pulverulenta – Zenobia