Rating of Ornamental Plants to Root Knot Nematodes

Table 1: Annual Flowers (Spring)
Resistant Susceptible Highly Susceptible
Floss flower (Ageratum houstonianum); Sweet scabious (Scabiosa atropurpurea); Summercypress (Kochia scoparia) Arctotis (Arctotis grandis); Four o’clock (Mirabilis jalapa); China aster (Callistephus chinensis); Portulaca (Portulaca grandiflora); Moonflower (Calonyction aculeatum); Cypressvine starglory (Quamoclit pinnata); Feather cockscomb (Celosia argentea); Castorbean (Ricinus communis); Spiderflower (Cleome spinosa); Scarlet sage (Salvia splendens); Cosmos (Cosmos bipinnatus); Aztec marigold (Tagetes erecta); Golden cosmos (Cosmos sulphureus); French marigold (Tagetes patula); Globeamaranth (Gomphrena globosa); Blackeyed clockvine (Thunbergia alata); Sunflower (Helianthus annuus); Blue torenia (Torenia fournieri); Balsam (Impatiens balsamina); Verbena (Verbena hybrida); Sultan snapweed (Impatiens sultani); Periwinkle (Locknera rosea) Morningglory (Ipomoea purpurea); Zinnia (Zinnia elegans); Petunia (Petunia hybrida)
Table 2: Annual Flowers (Fall)
Resistant Susceptible Highly Susceptible
Bugloss (Anchusa capensis); Lupine (Lupinus pubescens); Mexican poppy (Argemone mexicana); Forget-me-not (Mysotis sylvatica); Swanriver daisy (Brachycome iberidifolia); Baby-blue-eyes (Nemophila menziesii); Evening primrose (Oenothera speciosa); Clarkia (Clarkia elegans); Gaillardia (Gaillardia pulchella var. picta); Pincushionflower (Scabiosa atropurpurea) Browallia (Browallia speciosa); Sweet alyssum (Lolularia maritima); Cornflower (Centaurea cyanus); Annual stock (Mathiola incana var. annua); Sweet sultan (Centaurea moschata); Leptosyne (Coreopsis stillmani); Virginia stock (Mathiola maritima); Calliopsis (Coreopsis tenctoria); Flowering tobacco (Nicotiana alata + var. grandiflora); Rocket larkspur (Delphinium ajacis); Pinks (Dianthus plumarius); Shirley poppy (Papaver rhoeas); Winter marigold (Dimorphotheca aurantiaca); Annual phylox (Phylox drummondi); Mignonette (Resedra odorata); California poppy (Eschscholtzia california); Butterflyflower (Schizanthus pinnatus); Godetia (Godetia amoena); Blue laceflower (Trachymene coerulea); Babysbreath (Gypsophila paniculata); Nasturtium (Tropaeolum majus); Strawflower (Helichrysum bracteatum); Pansy (Viola tricolor); Rocket candytuft (Iberis amara); Verbena (Verbena hybrida); Toadflax (Linaria bipartita); Sweetpea (Lathyrus odoratus); Snapdragon (Antirrhinum majus); Petunia (Petunia hybrida); Calendula (Calendula officionalis)
Table 3: Flowering Perennials
Resistant Susceptible Highly Susceptible
Rudbeckia (Echinacea purpurea); Globeflower (Trollius ledebouri); Gaillardia (Gaillardia grandiflora) Coreopsis (Coreopsis grandilflora); Salvia (Salvia azurea, Salvia farinacea); Day lily (Hemerocallis species); Iris (Iris species); Tritoma (Kniphofia uvaria); Phylox (Phylox paniculata, Phylox subulata); Hollyhock (Althea rosea); Shasta daisy (Chrysanthemum maximum);
Table 4: Ground Covers & Vines
Resistant Susceptible
Cast iron plant (Aspidistra species);
Fatshedra (Fatshedra lizei);
English ivy (Hedera helix);
Yellow jasmine (Gelsemium sempervirens);
Dwarf junipers (Juniperus procumbens);
Coral honeysuckle (Lonicera sempervirens);
Liriope (Liriope muscari)
Plumbago (Plumbago capensis);
Moonseed vine (Menispermum species);
Strawberry begonia (Saxifraga decipiens);
Virginia creeper (Parthenocissus quinquefolia);
Confederate jasmine (Trachelospermum jasminoides);
Evergreen smilax (Smilax lanceloata);
Coral vine (Antigonon leptopus);
Trumpet creeper (Campsis radicans)
Ajuga (Ajuga repens);
Autumn clematis (Celmatis paniculata);
Creeping euonymus (Euonymus fortunei);
Potato vine (Dios corea species);
Hyacinth bean (Dolichos lablab);
Trailing lantana (Lantana sellowiana);
Climbing fig (Ficus pumila);
Cypress vine (Quamoclit pinnata);
Moss phylox (Phylox subulata);
Wisteria (Wisteria sinensis);
Dusty miller (Senecio cineraria);
Verbena (various species);
Periwinkle (Vinca major)
Table 5: Medium to Large Shrubs
Resistant Susceptible Highly Susceptible
Bamboo (Bambusa species); Wax myrtle (Myrica cerifera); French mulberry (Callicarpa americana); Mock orange (Philadephus coronarius); Photinia (Photinia glabra, Photinia serrulata); Pampa grass (Cortarderai selloana); Russian Olive (Elaeagnus angustifolia); Japanese yew (Podocarpus macrophylla maki); Chinese elaeagnus (Elaeagnus pungens); Cherry laurel (Prunus caroliniana); Indiana azalea (Rhododendron mucronatum); Pfitzer’s juniper (Juniperus chinensis pfitzerania); Yucca, Spanish dagger (Yucca species); Common juniper (Juniper communis) Blue vase juniper (Juniper chinensis blue vase); Texas sage (Leucophyllum Texanum) Barbery (Bereberis thunbergi); Oleander (Nerium oleander); Sananqua (Camellia sasanqua); Pittosporium (Pittosporium tobira); Japanese quince (Chaenomeles lagenaria); Flowering pomegranate (Punica grandatum); Euonymus (Euonymus japonicus) Fire thorn (Pyracantha unnamemisis); Althea (Rose of Sharon) (Hibiscus syriacus); Mescal bean (Sophora secundiflora); Popcorn or bridal wreath (Spireae prunifolia plena); Hydrangea (Hydrangea macrophyllia); Chinese holly (Ilex cornuta Bufordi); Reeve’s spireae (Spireae reevesiana); Jasmine (Jasmium primulinum); Babybreath (Spireae thunbergi); Ligustrum (Ligustrum japonicum); Viburnum (Viburnum odorathissimum; Viburnum suspensum; Viburnum tinus); Nandina (Nandina domestica); Abelia (Abelia grandiflora); Cape jasmine (Gardenia jasminoides)
Table 6: Small Trees
Resistant Susceptible Highly Susceptible
Japanese red maple (Acer palmatum atropurpureum); Golden rain tree (Koelreutoria paniculata); Red buckeye (Aesculus pavia) Crape myrtle (Lagestroemia indica); Mimosa (Albizzia julibrissin); Wax myrtle (Myrica cerifera); Redbud (Cercis canadensis); Parkinsonia or Jerusalem thorn (Parkinsonia aculeata); Fringe tree (Chionanthus virginicus) Silver maple – White poplar (Populus alba); Chinese parasol tree (Firmiana simplex); Lombardy poplar (Poplar nigra italica); Moraine honeylocust (Gleditsia triacanthos moraine); Cherry laurel (Prunus caroliniana); American holly (Ilex opaca); Chinese tallow (Sapium sebiferum); Yaupon (Ilex vomitoria); Sassafras (Sassafras varifolium); Dahoon or cassine holly (Ilex cassine); Vitex or chase tree (Vitex agnuscastus); Deciduous holly (Ilex decidua) Loquat (Eriobotryta japonica); Japanese magnolia (Magnolia species) Fruitless mulberry (Morus alba)

 

A Listing of ornamentals and their resistance to Cotton Root Rot are found in the Cotton Root Rot Section.

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