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Biological control agents: P
Pachycrepoideus vindemmiae (Hymenoptera: Pteromalidae) = Pachycrepoideus vindemiae
Pachylister chinensis (Coleoptera: Histeridae)
Pales feredayi (Diptera: Tachinidae)
Palexorista laxa (Diptera: Tachinidae)
Paraleptomastix abnormis (Hymenoptera: Encyrtidae) = Leptomastidea abnormis (Girault), Leptomastix abnormis
Paraleptomastix sp. (Hymenoptera: Encyrtidae)
Paropsiva spp. (Diptera: Tachinidae)
Passalora ageratinae (Capnodiales: Mycosphaerellaceae), Mexican devil weed leaf fungus
Patasson nitens (Hymenoptera: Mymaridae) = Anaphes nitens (Girault)
Pauesia nigrovaria (Hymenoptera: Braconidae)
Pauesia salignae (Hymenoptera: Braconidae) = Aphidius salignae
Pediobius acantha (Hymenoptera: Eulophidae) = Pediobius metallicus (Nees)
Pediobius epigonus (Hymenoptera: Eulophidae)
Pegohylemyia jacobaeae (Diptera: Anthomyiidae) = Botanophila jacobaeae
Pegohylemyia seneciella (Diptera: Anthomyiidae) = Botanophila seneciella
Pempelia genistella (Lepidoptera: Pyralidae) = Oncocera genistella, gorse colonial hard shoot moth
Pennisetia marginata (Lepidoptera: Sesiidae)
Perilampus sp. (Hymenoptera: Pteromalidae)
Periscepsia carbonaria (Diptera: Tachinidae)
Perrisia plicatrix (Diptera: Cecidomyiidae) = Dasineura plicatrix
Phanerotoma fasciata (Hymenoptera: Braconidae)
Phanerotoma tibialis auct. (Hymenoptera: Braconidae) = Phanerotoma fasciata
Pholetesor arisba (Hymenoptera: Braconidae) = Apanteles arisba
Pholetesor bicolor (Hymenoptera: Braconidae) = Apanteles bicolor
Pholetesor circumscriptus group (Hymenoptera: Braconidae) = Apanteles circumscriptus group
Phoma clematidina (Pleosporales: Pleosporaceae), old man's beard leaf fungus, phoma leaf spot
Phragmidium violaceum (Pucciniales: Phragmidiaceae)
Phymatothynnus sp (Hymenoptera: Tiphiidae)
Phytodecta olivacea (Coleoptera: Chrysomelidae) = Gonioctena olivacea, broom leaf beetle
Phytomyza vitalbae (Diptera: Agromyzidae), old man's beard leaf miner
Phytoseiulus persimilis (Parasitiformes: Phytoseiidae)
Platygaster demades (Hymenoptera: Platygastridae)
Platygaster hiemalis (Hymenoptera: Platygastridae)
Platygaster minutus (Hymenoptera: Platygastridae) = (possibly Platygaster hiemalis)
Platygaster sp. (Hymenoptera: Platygastridae) = Platygaster demandes (Walker)
Platyptilia isodactyla (Lepidoptera: Pterophoridae), ragwort plume moth
Plesiochrysa ramburi (Neuroptera: Chrysopidae) = Chrysopa ramburi
Pleurotropus epigonus (Hymenoptera: Eulophidae) = Pediobius epigonus (Walker)
Praon barbatum (Hymenoptera: Braconidae)
Pristomerus orbitalis (Hymenoptera: Ichneumonidae)
Procecidochares alani (Diptera: Tephritidae), mist flower gall fly
Procecidochares utilis (Diptera: Tephritidae), Mexican devil weed gall fly
Prospodium tuberculatum (Pucciniales: Uropyxidaceae), lantana leaf rust
Psecacera chiliensis (Diptera: Tachinidae)
Pseudelaphroptera brevipilosa (Hymenoptera: Tiphiidae)
Pseudoleucopis benefica (Diptera: Chamaemyiidae)
Pseudorhyssa maculicoxis (Hymenoptera: Ichneumonidae)
Psyllaephagus bliteus (Hymenoptera: Encyrtidae) = Psyllaephagus quadricyclus
Psyllaephagus gemitus (Hymenoptera: Encyrtidae)
Psyllaephagus pilosus (Hymenoptera: Encyrtidae)
Pteromalus puparum (Hymenoptera: Pteromalidae)
Pteromalus semotus (Hymenoptera: Pteromalidae) = Habrocytus milleri
Pterostichus unistriatus (Coleoptera: Carabidae) = Trirammatus unistratus
Puccinia araujiae (Pucciniales: Pucciniaceae), moth plant rust
Puccinia hieracii var. piloselloidarum (Uredinales: Pucciniaceae), hieracium rust
Puccinia lantanae (Pucciniales: Pucciniaceae), lantana blister rust
Puccinia myrsiphylli (Pucciniales: Pucciniaceae), bridal creeper rust
Puccinia punctiformis (Uredinales: Pucciniaceae), Californian thistle rust
Pullus sp. (Coleoptera: Coccinellidae)
Pyemotes zwoelferi (Acariformes: Pyemotidae)