426 
Aphis spiraecola 
Aphis viburniphila 
Viburnum opulus var. sterile 
(Snowball or Guelder 
Rose) 
Aphis fabae 
Aphis spiraecola 
Aphis viburnicola 
Aphis viburniphila 
Vicia faba (Broadbean or 
Horse Bean) 
Aphis medicaginis 
Myzus persicae 
Trifidaphis phaseoli 
Vigna sinensis (Common 
Cowpea) 
Aphis medicaginis 
Vinca sp. (Periwinkle) 
Aphis helichrysi 
Myzus circumflexus 
Myzus persicae 
Viola sp. (Violet) 
Myzus circumflexus 
Myzus persicae 
APHIDS OF THE ROCKY MOUNTAIN REGION 
Violet—see Viola 
Virginsbower—see Clematis 
Walnut—see Juglans 
Watercress—see Roripa 
Waterhemlock—see Cicuta 
Waterhyacinth—see 
Eichhornia 
Waterlily—see Nymphaea 
Watermelon—see Citrullus 
Wheatgrass—see Agropyron 
Wildrye—see Elymus 
Willcow—see Salix 
Willowweed, Sticky—see 
Epilobium 
Winterfat—see Eurotia 
Wistaria sp. (Wistaria) 
Aphis gossypii 
Witchgrass—see Panicum 
Wormwood—see Artemisia 
Xanthium canadense 
(Cocklebur) 
Capitophorus xanthii 
Xylosteon—see Lonicera 
Rhopalosiphum conii 
Yarrow—see Achillea 
Yellowcress——-see Roripa 
Yucca glauca (Yucca or 
Small Soapweed) 
Aphis helianthi 
Zantedeschia aethiopica 
(Callalily) 
Myzus circumflexus 
Myzus persicae 
Zea mays (Maize or Corn) 
Aphis armoraciae 
Aphis fabae 
Aphis maidi-radicis 
Myzus persicae 
Rhopalosiphum maidis 
Zygadenus sp. (Deathcamas) 
Macrosiphum kiowanepum 
Zygadenus nuttali 
(Grassy Deathcamas) 
Macrosiphum martini 
