Plants Resistant or Susceptible to Armillaria mellea,
The Oak Root Fungus
Robert D. Raabe
Department of Environmental Science and Management
University of California , Berkeley
Armillaria mellea is a common disease producing fungus found in much of
California . It commonly occurs naturally in roots of oaks but does not damage
them unless they are weakened by other factors. When oaks are cut down, the
fungus moves through the dead wood more rapidly than through living wood and
can exist in old roots for many years. It also does this in roots of other infected
trees. Infection takes place by roots of susceptible plants coming in contact with
roots in which the fungus is active. Some plants are naturally susceptible to
being invaded by the fungus. Many plants are resistant to the fungus and though
the fungus may infect them, little damage occurs. Such plants, however, if they
are weakened in any way may become susceptible and the fungus may kill them.
The plants listed here are divided into three groups. Those listed as resistant are
rarely damaged by the fungus. Those listed as moderately resistant frequently
become infected but rarely are killed by the fungus. Those listed as susceptible
are severely infected and usually are killed by the fungus.
The fungus is variable in its ability to infect plants and to damage them. Thus in
some areas where the fungus occurs, more plant species may be killed than in
areas where other strains of the fungus occur.
The list is composed of two parts. In Part A, the plants were tested in two ways.
Most were grown in an old orchard area known to be infested by the fungus at
the University of California Deciduous Fruit Station in Santa Clara , California .
Information about early procedures is not available. However, all plants tested
since 1952 were planted in the infested soil. In addition, two six to eight inch
pieces of woody branch material colonized by the fungus in the laboratory were
put next to the root system at the time of planting. Isolates used in these pieces
were selected for their ability to be highly virulent forms. Ten plants of each
species were tested. Following planting, plants were monitored periodically and
dead plants, particularly those with the oak root fungus were recorded. After ten
years, all remaining plants were pulled and their root systems were rated as to
the amount of infection found. In addition, some plants were tested in
greenhouse experiments in which ten plants each were exposed up to one year
to two strains of the fungus as listed above except this was done in unglazed
ceramic pots. This project was supported by a grant from the Elvin J Slosson
Fund and plants so tested are marked with a double asterisk**.
In the Fruits and Nuts section, many plants are included even though they may
not be used in the production of crops. They are included here so that
researchers may want to include them in their breeding experiments. If any of
these plants have been known to be used as ornamental plants, they are
included in that section.
Although when tested, pears have been found to be resistant, recently pears in
Lake County are becoming infected. Research will determine the reasons for
this. Also, the fungus in this area grows through the soil and can spread this
way. This is the only known area where this occurs.
Plants listed with a double asterisk** were tested in pots in a research
greenhouse. This research was funded by a grant from the Elvenia Slosson
Fund.
Plants listed in Part B were not tested for resistance or susceptibility. Information
presented is based on finding plants infected by the fungus, or finding plants that
are not infected. Additional information was obtained from the California Plant
Disease Host Index, published by the California Department of Food and
Agriculture and the list of plant diseases published by the American
Phytopathological Society, Fungi on Plants and Plant Products in the United
States. Plants marked with an asterisk * are from information supplied by the
staff of Quarryhill Botanical Garden , Glen Ellen.
Part A
RESISTANT PLANTS
Abies concolor
Acacia longifolia
Acacia mearnsii
Acacia verticillata
Acer cappadoicum
Acer crataegifolium
Acer macrophyllum
Acer palmatum
Acer saccharum
Acer tataricum
Acer tataricum ssp Ginnala
Ailanthus altissima
Ailanthus giraldii
Angophora cordifolia
Arbutus menziesii
Asimina triloba
Berberis polyantha
Betula pumila
Brachychiton pupulneus
Broussonetia papyrifera
Brugmansia suaveolens
Buxus sempervirens
Buxus sempervirens var.
arborescens
Callicarpa japonica
Calocedrus decurrens
Calycanthus occidentalis
Carpenteria californica
Catalpa bignonioides
Catalpa hybrida
Catalpa ovata
Celtis australis
Celtis occidentalis
Ceratonia siliqua
Cercis occidentalis
Cercis siliquastrum
Chaenomeles cathayensis
Chaenomeles japonica
Chamaecyparis lawsoniana
“Ellwoodii”
Colorado or White Fir
Sydney Golden Wattle, Bush Acacia
Black Wattle
Whorl-leaved or Star Acacia
Caucasian Maple
Hawthorne Maple
Big-leaf Maple, Oregon Maple
Japanese Maple
Sugar Maple
Tartarian Maple
Ginnala Maple, Amur Maple
Tree-of-heaven
Gum Myrtle, Smooth Bark Apple
Madrone
Papaw, Pawpaw
Swamp Birch, American Dwarf Birch
Kurrajong Bottle Tree
Paper Mulberry
Angel’s Trumpet
Common or English Box
Common Box (Tree Form)
Beauty-berry
Incense Cedar
Western Spice Bush, CA Allspice
Bush or Tree Anemone
Common Catalpa, Indian Bean
Hybrid Catalpa
Chinese Catalpa
European or Mediterranean Hackberry
Hackberry
Carob, St John’s Bread, Algarroba
CA Redbud, Western Redbud
Judas Tree, Love Tree
Flowering Quince
Japanese Flowering Quince
Ellwood Cypress
Chamaerops humilis
Chionanthus retusa
Clerodendron bungei
Cornus mas
Corynabutilon vitifolium
Correa “Victory Bells”
Cotinus coggygria
Cryptomeria japonica
Cupaniopsis anacardioides
Fan Palm
Chinese Fringe Tree
Kashmir Bouquet, Glory Flower
Cornelian Cherry, Sorbet
Flowering Maple
Cupressocyparis X leylandii
Cupressus arizonica var. glabra
Diospyros glaucifolia
Elaeagnus angustifolia
Erica arborea
Eucalyptus camaldulensis
Eucalyptus cinerea
Eucalyptus grandis
Eucalptus mannifera ssp
Maculosa
Eucalyptus melliodora
Eucalyptus risdonii
Eucomia ulmoides
Euonymus europeus
Exochorda korolkowii
Exochorda racemosa
Fabiana imbricate
Fraxinus angustifolia
Fraxinus ornus
Fraxinus uhdei
Fraxinus velutina var. glabra
“Modesto”
Garrya elliptica
Geijera parviflora
Ginkgo biloba
Gleditsia tricanthos inermis
“Shademaster”
Grewia biloba
Gymnocladus dioica
Hibiscus syriacus
Hypericum patulum
Ilex aquifolium
Ilex x aquipernyi
Ilex cassine
Ilex cornuta
Leyland Cypress
Smooth Arizona Cypress
Smoke Tree
Japanese Cryptomeria or Cedar
Carrotwood, Tuckeroo
Oleaster, Russian Olive, Silver Berry
Tree Heath
River Red Gum
Dollar-leaf Eucalyptus, Mealy Stringbark
Rose Gum
Brittle Gum
Yellow Box
Risdon Peppermint
Gutta-percha Tree
Common Spindle Tree
Pearlbush
Fabiana
Flowering Ash, Manna Ash
Shamel Ash, Evergreen Ash
Modesto Ash
Silk Tassel
Australian Willow, Wilga
Maidenhair Tree
Shademaster Locust
Kentucky Coffee Tree
Rose-of-Sharon, Shrub Althea
St. Johnswort
English Holly, Common Holly
Dahoon
Chinese Holly, Horned Holly
Ilex opaca
Ilex verticillata
Jacaranda mimosifolia
Koelreuteria paniculata
Lagerstroemia x amabilis
Ligustrum quinhoui
Ligustrum tschonskii
Liquidambar orientalis
Liquidambar styraciflua
Liriodendron tulipifera
Lonicera nitida
Lyonia mariana
Maackia amurense
Maclura pomifera
Magnolia grandiflora
Magnolia salicifolia
Mahonia aquifolium
Mahonia nevinii
Malus florentina
Malus floribunda
Malus ioensis
Maytenus boaria
Melaleuca stypheliodes
Melia azedarach
Metasequoia glyptostroboides
Myrica pensylvanica
Nandina domestica
Paulownia fortunei
Persea indica
Phellodendron amurense
Phellodendron chinense
Philadelphus coronaries
Phlomis fruticosa
Photinia davidsoniae
Photinia x fraseri
Pinus canariensis
Pinus halepensis
Pinus monticola
Pinus nigra ssp. Larico
Pinus patula
Pinus radiate
Pinus sylvestris
Pinus torreyana
Pistacia chinensis
Pittosporum crassifolium
American Holly
Black Alder, Winterberry
Jacaranda
Golden Rain Tree, Pride of India
Crepe Myrtle
Oriental Sweet Gum
American Sweet Gum, Liquidambar
Tulip Tree, Yellow or Tulip Poplar
Box Honeysuckle
Stagger Bush
Osage Orange
Southern Magnolia
Anise magnolia, Willow-leaf Magnolia
Holly Mahonia, Oregon Grape
Nevin Mahonia
Japanese Flowering Crab
Prairie Crabapple
Mayten Tree
Prickly Paperbark
Persian lilac, Bead Tree
Dawn Redwood
Bayberry, Candleberry
Sacred Bamboo, Heavenly Bamboo
Indian Avocado
Amur Cork Tree
Chinese Cork Tree
Mock Orange
Jerusalem Sage
Canary Island Pine
Aleppo Pine
Western White Pine
Corsican Pine
Mexican pine, Jelecote Pine
Monterey Pine
Scots Pine, Scotch Pine
Torrey Pine
Chinese Pistache, Chinese Pistachio
Caro, Karo, Evergreen Pittosporum
Pittosporum eugenoides
Pittosporum heterophyllum
Pittosporum phillyreoides
Pittosporum rhombifolium
Pittosporum tenuifolium
Pittosporum undulatum
Pittosporum viridiflorum
Prunus caroliniana
Prunus ilicifolia
Prunus lyonii
Prunus virginiana
Pseudocydonia sinensis
Psidium littorale var. longipes
Quercus ilex
Quercus lobata
Quercus phillyraeoides
Quillaja saponaria
Rhus aromatica
Rhus copallina
Sambucus canadensis
Sapium sebiferum
Sequoia sempervirens
Shepherdia argentea
Sophora japonica
Styrax japonicum
Symphoricarpos sp.
Syngonium paniculatum
Taxodium distichum
Ternstroemia sylvatica
Tilia tomentosa
Tristania conferta
Ulmus x “Sapporo Gold”
Ulmus parvifolia
Vitex agnus-castus
Wisteria sinensis
Terata, Lemonwood
Narrow-leaved or Weeping Pittosporum
Queensland Pittosporum
Tawhiwhi
Victorian Box, Orange Berry Pittosporum
Cape Pittosporum
American Cherry Laurel
Holly-leaf Cherry, California Cherry
Catalina Cherry
Choke Cherry
Chinese Quince
Strawberry or Purple Strawberry Guava
Holly Oak, Holm Oak, Truffle Oak
Valley Oak, California White Oak
Soapbark Tree, Quillay, Soap Bush
Fragrant Sumac, Lemon Sumac
Shining Sumac, Dwarf Sumac
American or Sweet Elder
Chinese or Vegetable Tallow Tree
Coast Redwood, CA Redwood
Buffalo Berry, Silverberry
Japanese Pagoda Tree
Japanese Snowball
Snowberry
Australian Bush Cherry
Bald Cypress, Swamp Cypress
Mexican Ternstroemia
Silver Linden, Silver Lime
Brisbane Box
Chinese Elm
Blue Chaste Tree, Chaste Tree
Part A
MODERATELY RESISTANT PLANTS
Abelia grandiflora
Abutilon pictum
Acer negundo ssp. Californicum
Acer tegmentosum
Albizia julibrissin
Amorpha fruticosa
Amorpha fruticosa var. nana
Berberis darwinii
Berberis thunbergii
Berberis wilsoniae
Cephalanthus occidentalis
Cestrum elegans
Chamaecyparis lawsoniana
Chamaecytisus purpureus
Chimonanthus praecox
Cladrastis lutea
Crataegus phaenopyrum
Crotalaria agatiflora
Dais cotinifolia
Elaegnus commutate
Eucalyptus polyanthemos
Eucalyptus pulchella
Euonymus japonica
Grevillea robusta
Grewia similes
Hebe x andersonii
Hebe speciosa
Hovenia dulcis
Iochroma cyanea
Koelreuteria paniculata
Lagerstroemia indica
Ligustrum japonicum
Myrtus communis
Nerium oleander
Paulownia fargesii
Photinia bearverdiana
Picea abies
Pinus brutea ssp. Eldarica
Glossy Abelia, White Abelia
Flowering Maple
Box Elder
Silk Tree
False Indigo, Indigo Bush
Bastard Indigo
Darwin Barberry
Japanese Barberry
Wilson Barberry
Buttonbush, Buttonwillow, Honey Bells
Lawson Cypress, Port Orford Cedar
Purple Broom
Wintersweet
Kentucky or American Yellowood
Washington Thorn
Canary-Bird Bush, Pompon Tree
Silverberry
Redbox Gum, Silver Dollar Gum
White Peppermint
Evergreen or Japanese Euonymus
Silk Oak
Anderson Speedwell
Showy or Imperial Speedwell
Japanese or Chinese Raisin Tree
Purple Tobacco
Golden Rain Tree, Pride of India
Crape Myrtle
Japanese Privet, Wax-leaf Privet
Myrtle
Oleander
Norway Spruce
Eldarica Pine
Pinus jeffreyi
Pinus nigra
Pittosporum tobira
Prunus grayana
Prunus subhirtella
Pseudotsuga menziesii
Pyracantha coccinea
Pyracantha coccinea ‘Lalandei”
Pyracantha coccinea “Wyattii”
Pyracantha crenatoserrata
Pyracantha crenulata var.
kansuensis
Pyracantha x “Forest Hills”
Pyracantha x “Morettii”
Quercus chrysolepis
Rosmarinus officinalis
Sequoiadendron giganteum
Spiraea prunifolia
Wisteria macrostachys
Zelkova serrata
Jeffrey Pine
Austrian Pine
Japanese Pittosporum, Tobira
Japanese Bird Cherry
Rosebud Cherry, Spring Cherry
Douglas Fir
Scarlet Firethorn
Lalande Pyracantha
Kansu Firethorn
Canyon Oak, Golden Cup Oak
Rosemary
Giant Redwood
Bridal Wreath, Shoe-button Spiraea
Wisteria
Japanese Zelkova
Part A
SUSCEPTIBLE
Abutilon
Abutilon megapotamicum
Abutilon vitifolium
Acacia floribunda
Acer capillipes
Acer cauditifolium
Acer fulvescens var.
pentalobatum
Albizzia lophantha
Arbutus unedo
Azara microphylla
Betula pendula
Buddleja davidii var. magnifica
Buddleja forestii
Buddleja globosa
Caesalpinia gilliesii
Callistemon viminalis
Carpinus betulus
Caryopteris x clandonensis
Casuarina verticillata
Ceanothus arboreus
Ceanothus thyrsiflorus
Cercidiphyllum japonicum
Cotoneaster harrovianus
Cotoneaster horizontalis
Cotoneaster lacteus
Cotoneaster microphyllus
Cotoneaster pannosus
Cotoneaster salicifolius var.
floccosus
Deutzia scabra
Dodonea viscosa
Erica carnea
Erica intertesta
Erythrina crista-galli
Escallonia bifida
Escallonia x franciscana
Escallonia pulverulenta
Escallonia rubra var. macrantha
Eucalptus baueriana
Trailing Abutilon
Sydney Acacia, Sydney Wattle
Plum Albizz
Strawberry Tree
Box Leaf Azara
European White Birch, Silver Birch
Butterfly Bush, Summer Lilac
Oxeye Butterfly Bush
Orange Ball Tree
Bird of Paradise Bush
Weeping Bottle Brush
European Hornbeam, Common Hornbeam
Blue Mist, Bluebeard
She Oak, Beefwood, Horsetail Tree
Catalina Mountain Lilac
Blue Blossom, Blue Brush
Harrow Cotoneaster
Rock Cotoneaster
Clusterberry or Parney Cotoneaster
Rockspray Cotoneaster
Silver Leaf Cotoneaster
Hardy Willowleaf Cotoneaster
Fuzzy Deutzia
Native Hops
Winter Heath, Mediterranean Heather
Cockspur Coral Tree, Coral Tree
White Escallonia
Rose or Slippery-elm Escallonia
Red Escallonia
Blue Box
Eucalyptus citriodora
Eucalyptus gracilis
Eucalyptus grossa
Eucalyptus maculata
Eucalyptus pauciflora
Eucalyptus pulverulenta
Eucalyptus rudis
Eucalyptus sideroxylon
Eucalyptus tereticormis
Euonymus japonicus “Aureomarginata”
Euphorbia pulcherrima
Fagus sylvatica
Felecia fruticosa
Fontanesia phillyreoides ssp.
fortunei
Fraxinus holotricha
Fremontodendron mexicanum
Genista x spachiana
Gordonia lasianthus
Hakea laurina
Hakea oleifolia
Hebe odora
Heteromeles arbutifolia
Hydrangea quercifolia
Hypericum beanii
Hypericum prolificum
Kennedia sp.
Kerria japonica
Laburnum angyroides
Laburnum x watereri “Vossii”
Leptospermum laevigatus
Leptospermum scoparium
Ligustrum vulgare “Aureum”
Lithocarpus densiflorus
Malus x eleya
Malus floribunda
Malus hupehensis
Malus sargentii
Malus toringoides
Melaleuca decora
Melaleuca hypericifolia
Melaleuca leucadendra
Melaleuca linarifolia
Melaleuca radula
Lemon-scented Gum
Yorrell, White Mallee
Coarse-flowered Mallee
Spotted Gum
Cabbage Gum, Snow or Ghost Gum
Silver Dollar Tree, Silver-leaved Gum
Desert Gum, Moitch Eucalyptus
Pink Iron Bark, Red Iron Bark
Forest Red Gum
Golden Euonymus
Poinsettia, Christmas Flower
European Beech, Common Beech
Kimberly Blue Ash
Southern or Mexican Fremontia
Eastern Broom
Loblolly Bay
Sea Urchin Tree, Pincushion Hakea
Boxleaf Veronica
Toyon, Christmas Berry
Oakleaf Hydrangea
Henry St. Johnswort, Goldflower
Shrubby St. Johnswort, Broombrush
Coral Tree
Japanese Rose Kerria, Globe Flower
Golden Chain Tree
Long Cluster Golden Chain Tree
Australian Tea Tree
New Zealand Tea Tree, Manuka
Yellowleaf European Privet
Tan Bark Oak
Eley Crab Apple
Japanese Flowering Crabapple
Tea Crab Apple
Sargent Crab Apple
Cutleaf Crab Apple
Dotted Melaleuca
Cajeput Tree, Punk Tree
Flax-leaf Paperbark
Melaleuca styphelioides
Myrtus communis “Variegata”
Paulowina tomentosa
Paulownia tomentosa “Lilacina”
Picea pungens
Pinus brutia
Pinus monophylla
Pinus nigra
Prunus laurocerasus
Prunus triloba
Pyracantha angustifolia
Pyracantha crenato-serrata
Pyracantha crenulata
Pyracantha koidzumii
Pyracantha rogersiana
Quercus dumosa
Quercus virginiana
Rhododendron cv Blue Diamond
Rhus ovata
Rhus trilobata
Schinus chichita var. rhoifolius
Schinus lentiscifolius
Schinus longifolius
Schinus polygamus
Schinus terebinthifolius
Senna multiglandulosa
Sesbania punicea
Severina buxifolia
Sutherlandia frutescens
Syringa vulgaris
Tecoma stans
Thuja plicata
Ulex europaeus
Viburnum tinus
Weigela florida
Wistaria frutescens
Xylosma congestum
Prickly Paperbark
Variegated Myrtle
Royal Paulownia, Empress Tree
Colorado Blue Spruce
Brutia Pine
One-needled Pinyon Pine
Black Pine, Austrian Pine
Cherry Laurel, English Laurel
Flowering Almond
Narrowleaf Firethorn
Yunan Firethorn
Nepal Firethorn, Nepalese White Thorn
Formosa Firethorn
Rogers Firethorn
CA Scrub Oak
Southern Live Oak
Blue Diamond Azalea
Sugarbush, Sugar Sumac
Squawbush, Skunkbush
Aroeira Blanca
Coroba
Molle
Pepper Tree
Brazilian Pepper Tree
Senna, Wooly Senna
Glory Pea, Scarlet Wisteria Tree
Chinese Box Orange
Balloon Pea, Duck Plant
Lilac
Yellow Bells, Yellow Elder
Giant Arborvitae, Western Red Cedar
Furze, Irish or Common Gorze
Laurustinus
Weigela
American Wisteria
Part A
RESISTANT FRUITS AND NUTS
Carya illinoinensis
Castanea dentata
Castanea sativa
Diospyros kaki
Diospyros lotus
Diospyros virginiana
Ficus carica “Kadota”
Ficus carica “Mission”
Juglans hindsii
Malus bacatta var. mandshurica
Malus coronaria
Malus glaucescens
Malus orientalis
Malus pumila
Malus rockii
Malus sylvestris
Persea americana
Pistacia integerrima
Prunus cerasifera
Prunus cerasifera
Prunus x domestica ssp. institia
Prunus grayana
Prunus humilis
Prunus persica “Indian Peach”
Prunus pubigera
Prunus salicina
Prunis salicina “Methley”
Prunus salicifolia
Prunus tenella
Prunus virginiana
Pyrus betulifolia
Pyrus calleryana
Pyrus communis
Pyrus communis “Bartlett”
Pyrus communis
Pyrus elaeagrifolia
Pyrus regelii
Pyrus tadschikistarica
Rubus ulmifolia inermis
Rubus ursinus “Loganobaccus”
Rubus ursinus “Ollalie”
Pecan
American Chestnut
Spanish Chestnut
Japanese Persimmon
Date-plum Persimmon
American Persimmon, Possum Wood
Kadota Fig
Mission Fig
California Black Walnut
Siberian Crab
Paradise Apple
French Crab Apple
Avocado
Myrobalan Plum 29-C71
Mariana Plum 2624
St. Julien Plum
Japanese Bird Cherry
Humble Bush Cherry
Indian Peach
Methley Plum
Black Cherry, Mexican Bird Cherry
Dwarf Russian Almond
Choke Cherry
Birchleaf Pear
Callery Pear
French Pear, Common Pear
Bartlett Pear (rooted cuttings)
Hybrid Old Home x Farmingdale
Mertens Thornless Blackberry
Loganberry
Ollalieberry
Part A
MODERATELY RESISTANT FRUITS AND NUTS
Cydonia oblonga
Malus prunifolia
Prunus sp.
Prunus avium
Prunus mexicana
Prunus mume
Prunus salicina
Pyrus communis
Pyrus communis
Quince
Pear-leaf Crabapple
Black Damask Plum
Mazzard Sweet Cherry
Big Tree Plum
Japanese Apricot
Japanese Plum
Cultivar Old Home (rooted cuttings)
Winter Nelis
Additions to list (from Bob’s handwritten notes) that I did not find on the Slosson 3rd year
report
Susceptible
Persicaria microphylla “Red Dragon”
Salvia leucantha
Salvia conferlifolia
Resistant
Pandorea jasminoides
Part A
SUSCEPTIBLE FRUITS AND NUTS
Actinidia deliciosa
Castanea mollissima
Malus orthocarpa
Malus pallinsiana
Malus prunifolia
Pistacia atlantica
Pistacia mutica
Pistacia vera
Prunus alleghaniensis
Prunus armeniaca
Prunus armeniaca var. sibirica
Prunus bucharica
Prunus cerasifera var. divaricata
Prunus cerasoides
Prunus curdica
Prunus x dasycarpa
Prunus davidiana
Prunus domestica “Clyman”
Prunus domestica “Diamond”
Prunus domestica “French
Prune”
Prunus dulcis
Prunus fenzliana
Prunus fenzliana x Prunus
Americana
Prunus gracilis
Prunus hortulana
Prunus kansuensis
Prunus mahaleb
Prunus munsoniana
Prunus nigra
Prunus pedunculata
Kiwi
Chinese Chestnut
Plum-leafed or Chinese Apple
Mt. Atlas Mastic Tree
Pistachio
Alleghany Plum
Apricot
Siberian Apricot
Red-leaved Cherry Plum
Purple or Black Apricot
David’s Peach
Clyman Plum
Diamond Plum
French Prune
Oklahoma Plum Prairie Cherry
Hortulana Plum
Kansu Plum
Perfumed Cherry, St. Lucien Cherry
Wild Goose Plum
Canadian Plum
Prunus petunnikowii
Prunus persica
Prunus serrulata
Prunus spinosa
Prunus tomentosa
Prunus virginiana var. demissa
Pterpcarya stenoptera
Vitis sp.
Peach
Japanese or Oriental Flowering Cherry
Sloe, Blackthorn
Downy, Nanking, Manchu or Bush Cherry
Chokecherry, Western Chokecherry
Chinese Wingnut
Grape
Part B - PLANTS NOT TESTED
RESISTANT
Acer sp. (except A. negundo
var. californica
A. capillipes, A. cauditifolium
Aesculus x carnea
Agonis sp.
Arctostaphylos sp.
Araucaria sp. (except A.
cunninghamii)
Arctostaphylos. sp.
Bambusa sp.
Calluna sp.
Cornus sp. (except C. florida
and C. capitata)
Euryops pectinatus
Hedera canariensis
Hedera helix
Helianthemum sp.
Magnolia sp.
Morus sp.
Philadelphus sp.
Phyllostachys sp.
Platanus sp.
Rhaphiolepis indica
Rhaphiolepis umbellata
Robinia sp.
Sarcocca sp.
Sassafras albidum
Tamarix sp.
Tibouchina urvelleana
Vaccinium sp.
Willow Myrtle
Manzanita
Manzanita
Bamboo
Heather
Dogwood
Algerian Ivy
English Ivy
Sun Rose
Magnolia
Mulberry
Mock Orange
Bamboo
Plane Tree, Sycamore
Indian Hawthorn
Yeddo Hawthorn
Locust
Sweet Box
Sassafras
Tamarisk
Pleroma, Princess Flower
Huckleberry
Part B – PLANTS NOT TESTED
MODERATELY RESISTANT
*Alnus sp.
*Aralia chinensis
*Betula platyphylla var. japonica
*Betula szechuanica
*Buddleja japonica
*Buddleja officinalis
*Caryopteris incana
*Cephalotaxus harringtonia
*Chamaecyparis obtusa
*Cornus capitata
*Cornus chinensis
*Corylopsis sinensis var.
calvenscens
*Cryptomeria japonica
*Desmodium elegans
*Deutzia glomeruliflora
*Hydrangea aspera
*Hypericum patulum
*Idesia polycarpa
*Indigofera hebepetala
*Indigofera heterantha
Indigofera sp.
*Junierus formosana
*Leptodermis potaninii
*Ligustrum delavayanum
*Lindera erythrocarpa
*Lonicera morrowii
*Lonicera syringantha
*Malus sieboldii
*Malus yunnanensis
*Osmanthus delavayi
*Philadelphus schrenkii
*Pterocarya rhoifolia
Alder
Fern-leaf Aralia, Chinese Aralia
Japanese White Birch
Bluebeard, Blue Spiraea
Cow’s Tail Pine, Japanese Plum Yew
Hinoki Cypress
Bentham’s Cornus
Winter Hazel
Japanese Cedar or Redwood
Sugarwood
Taiwan Juniper
Toringo Crabapple
Delavay Osmanthus
*Pyracantha atalantioides
*Pyrus pyrifolia
*Rhus chinensis
*Sciadapitys verticillata
*Spiraea henryi
*Stachyurus praecox
*Syringa reticulata
*Syringa yunnanensis
*Tsuga dumosa
*Tsuga forestii
*Viburnum cinnamomifolium
*Viburnum cylindricum
*Viburnum foetidum var.
ceanothoides
*Weigela decora
*Weigela hortensis
Sand Pear
Chinese Gall, Nutgall
Umbrella Pine, Japanese Umbrella Pine
Japanese Tree Lilac
Himalayan Hemlock
Cinnamon Viburnum
Part B - PLANTS NOT TESTED
SUSCEPTIBLE
Acer negundo ssp. Californicum
Begonia tuberhybrida
Camellia sp.
*Carpinus japonica
Cedrus deodora
Cedrus lebani
Cedrus lebani ssp. atlantica
Citrus sp.
Cotoneaster gracilis
Cotoneaster moupinensis
Crassula ovata
Cupressus funebris
Cyclamen sp.
Dahlia hortensis
Erica sp. (except E. arborea)
Eriobotrya japonica
*Eurya emarginata
*Eurya japonica
Fragaria x ananassa
Fuchsia sp.
Gardenia jasminoides
Hebe buxifolia
CA Box Elder
Tuberous Begonia
Camellia
Japanese Hornbeam
Deodar Cedar
Cedar of Lebanon
Atlas Cedar
Citrus
Jade Tree, Jade Plant
Mourning or Chinese Weeping Cypress
Cyclamen
Dahlia
Loquat
Strawberry
Fuchsia
Gardenia
Hebe
Hibiscus sp.
Hippiastrum vitatum
*Hydrangea heteromalla
Hydrangea macrophylla
*Hydrangea paniculata
Impatiens sodenii
Iris germanica
Juglans regia
Juniperus sp.
Laurus nobilis
Ligustrum sp. (except L.
tschonskii and L. japonicum)
Musa x paradisiacal
Nyssa sp.
Olea europea
Opuntia stricta var. dilleni
Paeonia lactiflora
Pelargonium sp.
Quercus kellogii
Rhamnus californicus
*Rhamnus crenatus
*Rhamnus japonicus
Rhododendron sp.
Rosa sp.
Rubus sp. (except Merten
Thornless, loganberry,
ollalieberry)
Salix pendulina
*Schima wallichii
Schinus molle
Syagrus rommanzoffiana
Trachelospermum jasminoides
Zantedeschia sp.
Hibiscus
Amaryllis
Hydrangea
Flag, Bearded Iris
Persian Walnut
Prostrate Junipers
Sweet Bay
Privet
Banana
Tupelo
Olive
Prickly Pear Cactus
Peony
Geranium
California Black Oak
Coffeeberry
Rhododendron, Azalea
Rose
Wisconsin Weeping Willow
California Pepper Tree
Queen Palm
Star Jasmine
Calla