422 
Poa annua (Annual 
Bluegrass) 
Sipha glyceriae 
Poa pratensis (Kentucky 
Bluegrass) 
Forda formicaria 
Forda olivacea 
Poinsettia sp. 
Pemphigus balsamiferae 
Poisonvetch—see 
Astragalus 
Polemonium mellitum 
speciosum (Cream 
Polemonium) 
Kakimia polemonii 
Polygonum sp. (Knotweed) 
Aphis medicaginis 
Capitophorus hippophaes 
Macrosiphum solanifolii 
Rhopalosiphum nymphaeae 
Polygonum aviculare 
(Prostate Knotweed) 
Aspidaphis polygoni 
Polgonum punctatum 
(Dotted Smartweed) 
Rhopalosiphum nymphaeae 
Poppy—see Papaver 
Populus sp. (Poplar) 
Chaitophorus populi 
Pemphigus bursarius 
Pterocomma populifoliae 
Pterocomma pseudopopulea 
Pterocomma smithiae 
Populus acuminata 
(Lanceleaf Cottonwood) 
Aphis maculatae 
Chaitophorus populifoliae 
Pemphigus populicaulis 
Periphyllus populicola 
Populus angustifolia 
(Narrowleaf Cottonwood) 
Aphis maculatae 
Aphis vorabonnevilla 
Chaitophorus populellus 
Cornaphis populi 
Pemphigus balsamiferae 
Pemphigus monophagus 
Pemphigus populi-globuli 
Pemphigus populi-venae 
Periphyllus bruneri 
Periphyllus populicola 
Pterocomma populifoliae 
Thecabius populi-monilis 
Populus candicans 
(Balm-of-Gilead) 
Pemphigus populi-globuli 
Pemphigus populi-ramulorum 
Periphyllus populicola 
Pterocomma pseudopopulea 
Thecabius 
populi-conduplifolius 
Populus deltoides (Eastern 
Cottonwood or Poplar) 
APHIDS OF THE ROCKY MOUNTAIN REGION 
Aphis vorabonnevilla 
Thecabius 
populi-conduplifolius 
Populus nigra var. italica 
(Lombardy Poplar) 
Aphis maculatae 
Pterocomma pseudopopulea 
Populus occidentalis—see 
Populus sargenti 
-Populus sargenti (Plains 
Cottonwood or Poplar) 
Aphis maculatae 
Asiphum pseudobyrsa 
Chaitophorus populellus 
Mordvilkoja vagabunda 
Pemphigus junctisensoriatus 
Pemphigus nortonii 
Pemphigus populicaulis 
Pemphigus populi-ramulorum 
Pemphigus populi-transversus 
Periphyllus populicola 
Pterocomma pseudopopulea 
Pterocomma smithiae 
Thecabius 
populi-conduplifolius 
Populus tacamahaca 
(Tacamahac Poplar) 
Pemphigus balsamiferae 
Pemphigus monophagus 
Pemphigus populi-ramulorum 
Periphyllus bruneri 
Thecabius gravicornis 
Thecabius populi-monilis 
Populus tremula (European 
Aspen) 
Asiphum tremulae 
Populus tremuloides 
Quaking Aspen) 
Aphis maculatae 
Asiphum rosetti 
Asiphum sacculi 
Chaitophorus populifoliae 
Periphyllus bruneri 
Pterocomma beulahensis 
Pterocomma populifoliae 
Potato—see Solanum 
tuberosum 
Potentilla sp. (Cinquefoil) 
Capitophorus fragaefolii 
Kakimia potentillae 
Macrosiphum solanifolii 
Macrosiphum martini 
Potentilla anserina 
(Silverweed Cinquefoil) 
Aphis argentinae-radicis 
Potentilla fructicosa (Bush 
Cinquefoil) 
Macrosiphum wasintae 
Prairie Smoke Sieversia— 
see Sieversia 
Primrose—see Primula 
Primrose, Evening—see 
Oenothera 
Primula forbesi (Forbes 
Primrose) 
Myzus persicae 
Primula parryi (Parry 
Primrose) 
AmpsAorophora pawtincae 
Prunus sp. (Cherries, 
Plums, Peaches) 
Aphis cardui 
Phorodon humuli 
Prunus americana 
(American Plum) 
Aphis cardui 
Aphis helichrysi 
Aphis setariae 
Hyalopterus arundinis 
Myzus cerasi 
Myzus persicae 
Phorodon humuli 
Prunus armeniaca (Common 
Apricot) 
Aphis zonassa 
Hyalopterus arundinis 
Myzus persicae 
Prunus besseyi (Bessey 
Cherry) 
Myzus persicae 
Rhopalosiphum scirpifolii 
Prunus cerasus (Sour 
Cherry) 
Myzus cerasi 
Myzus persicae 
Prunus domestica (Garden 
Plum) 
Aphis helichrysi 
Aphis setariae 
Hyalopterus arundinis 
Myzus persicae 
Prunus japonica (Chinese 
Bush Cherry) 
Aphis spiraecola 
Prunus mahaleb (Mahaleb 
Cherry) 
Myzus lythri 
Prunus persica (Peach) 
Aphis persicae-niger 
Myzus persicae 
Prunus virginiana (Common 
Choke Cherry) 
Aphis cerasifoliae 
Asiphonaphis pruni 
Myzus persicae 
Pseudotsuga taxifolia 
(Douglasfir) 
Cinara osborni 
Cinara pseudotaxifoliae 
Cinara pseudotsugae 
Cinara splendens 
Cinara taxifoliae 
Ptiloria—see Stephanomeria 
Pumpkin—see Cucurbita 
Purshia tridentata (Bitter- 
brush or Antelopebrush) 
Macrosiphum purshiae 
