Host PLANT LIsT 
Sonchus sp. (Sowthistle) 
Amphorophora sonchi 
Macrosiphum solanifolii 
Pemphigus bursarius 
Sonchus oleraceus (Common 
Sowthistle) 
Amphorophora sonchi 
Sorbus sp. (Mountainash) 
Aphis pomi 
Prociphilus corrugatans 
Sorghum vulgare (Sorghum) 
Rhopalosiphum maidis 
Sowthistle—see Sonchus 
Sphaeralcea coccinea 
(Scarlet Globe Mallow) 
Myzus persicae 
Spiraea sp. (Spirea) 
Aphis spiraephila 
Spiraea vanhoutti 
(Vanhoutte Spirea) 
Aphis spiraecola 
Spruce—see Picea 
Squash—see Cucurbita 
Stachys palustris (Marsh 
Betony) 
Capitophorus ribis 
Starlily—see Leucocrinum 
Stellaria sp. (Chickweed) 
Brachycolus stellariae 
Stellaria media (Common 
Chickweed) 
Myzus persicae 
Stephonomeria pauciflora 
(Ptiloria) (Wire Lettuce) 
Macrosiphum bonitum 
Stickseed—see Lappula 
Stipa sp. (Needle grass) 
Rhopalosiphum rhois 
Stock—see Mathiola 
Strawberry—see Fragaria 
Straw flower—see 
Helichrysum 
Sumac—-see Rhus trilobata 
Sumpweed—see Iva 
Sunflower—see Helianthus 
Sweetclover—see Melilotus 
Sweetpea—see Lathyrus 
Symphoricarpos sp. 
(Snowberry) 
Amphicercidus flocculosus 
Amphicercidus pulverulens 
Aphis incognita 
Brevicoryne symphoricarpi 
Rhopalosiphum conii 
Symphoricarpos occidentalis 
(Western Snowberry) 
Aphis incognita 
Brevicoryne symphoricarpi 
Symphoricarpos rotundifolia 
(Roundleaf Snowberry) 
Brevicoryne symphoricarpi 
Tanacetum vulgare 
(Common Tansy) 
Aphis helichrysi 
Macrosiphum ludovicianae 
Myzus persicae 
Tansy—see Tanacetum 
Tansy mustard—see 
Descurainia 
Taraxacum officinale 
(Common Dandelion) 
Aphis armoraciae 
Aphis knowltoni 
Aphis medicaginis 
Aphis menthae-radicis 
Macrosiphum taraxaci 
Prociphilus erigeronensis 
Trama rara 
Tetradymia canescens 
(Gray Horsebrush) 
Aphis tetradymiae 
Tetraneuris sp. 
(Tetraneuris) 
—see Actinea 
Thalictrum sp. (Meadowrue) 
Kakimia purpurascens 
Thermopsis montana 
(Buffalo Pea) 
Macrosiphum thermopsaphis 
Thimbleberry—see Rubus 
Thistle—see Cirsium 
Thuja sp. (Arborvitae) 
Cinara idahoensis 
Cinara winonkae 
Tilia sp. (Linden) 
Myzocallis tiliae 
Timothy—see Phleum 
Tobacco—see Nicotiana 
Tomato—see Lycopersicon 
Tragopogon pratensis 
(Meadow Salsify) 
Aphis armoraciae 
Tribulus terrestris 
(Puncturevine) 
Aphis medicaginis 
Trifolium sp. (Clover) 
Macrosiphum pisi 
Trifolium hybridum 
(Alsike Clover) 
Aphis helichrysi 
Trifolium pratense (Red 
Clover) 
Aphis bakeri 
Aphis helichrysi 
Aphis medicaginis 
Myzus persicae 
Trifolium repens (White 
Clover) 
Aphis helichrysi 
Myzus persicae 
Triticum sp. 
Brachycolis tritici 
Macrosiphum granarium 
Rhopalosiphum fitchii 
Toxoptera graminum 
Triticum aestivum (Wheat) 
Aphis medicaginis 
425 
Aphis setariae 
Brachycolus tritici 
Forda olivacea 
Myzus persicae 
Rhopalosiphum fitchii 
Rhopalosiphum splendens 
Rhopalosiphum subterraneum 
Toxoptera graminum 
Tropaeolum majus 
(Common Nasturtium) 
Aphis fabae 
Myzus persicae 
Tulipa sp. (Tulip) 
Aphis tulipae 
Macrosiphum euphorbiae 
Myzus persicae 
Turnip—see Brassica rapa 
Typha latifolia (Common 
Cat-tail) 
Rhopalosiphum enigmae 
Rhopalosiphum nymphaeae 
Ulmus americana (American 
Elm) 
Eriosoma americanum 
Erisoma lanigerum 
Erisoma rileyi 
Myzocallis ulmifolii 
Colopha graminis 
Ulmus fulva (Slippery Elm) 
Eriosoma crataegi 
Gobiashia ulmifusa 
Ulmus procera (English 
Elm) 
Colopha ulmisacculi 
Urtica gracilis (Slim 
Nettle) 
Amphorophora urticae 
Aphis fabae 
Aphis helianthi 
Aphis helichrysi 
Macrosiphum sibiricum 
Valeriana sp, (Valerian) 
Aphis pseudovalerianae 
Aphis valerianae 
Valeriana edulis (Edible 
Valerian) 
Aphis valerianae 
Macrosiphum valeriange 
Veratrum californicum 
(California 
Falsehellebore) 
Aphis coweni 
Verbena bipinnatifida 
(Dakota Verbena) 
Aphis gossypii 
Myzus persicae 
Veronica sp. (Speedwell) 
Rhopalosiphum nymphaeae 
Vetch—see Vicia 
Viburnum Opulus (European 
Cranberrybush) 
Aphis fabae 
