wild pear

organ parasitic mode stage note taxonomic group parasite
systemic scale Diaspididae Parlatoria oleae
leaf vagrant Psyllidae Cacopsylla notata
stem vagrant Psyllidae Cacopsylla bidens
flower gall Cecidomyiidae Contarinia piri
leaf bud gall Cecidomyiidae Apiomyia bergenstammi
leaf down Erysiphales Phyllactinia mali
leaf down Erysiphales Podosphaera leucotricha
leaf gall Cecidomyiidae Dasineura pyri
leaf gall Eriophyidae Eriophyes pseudoinsidiosus
leaf gall Eriophyidae Eriophyes pyri
leaf gall Psyllidae Cacopsylla pyri
leaf gall Psyllidae Cacopsylla pyricola
leaf pustule aecia Pucciniales Gymnosporangium sabinae
leaf gall spring generation Aphididae Dysaphis pyri
leaf gall spring generation Aphididae Melanaphis pyraria
leaf vagrant spring generation Aphididae Rhopalosiphum oxyacanthae
fruit vagrant Aphididae Aphanostigma piri
leaf gall spring generation Aphididae Anuraphis farfarae
leaf vagrant spring generation rarely Aphididae Anuraphis pyrilaseri


the part of the plant that most conspicuously is hit by the parasite

all buds: both flower buds and leaf buds
flower: also inflorescence
leaf: also needle, phyllodium, petiole
leaf bud: also unfolding young leaf
fruit: also seed
root: also root stock, runners
root collar: also the lowest part of the stem
stem: also culm, the lower part of the peduncle, in grasses also leaf sheath
systemic: the entire above-ground plant.


borer: larva living internally, almost no outwards signs
down: 0.5-2 mm high fungal down
film: very thin cover of fungal tussue
gall: swelling and/or malformation
grazer: feeding at the outside of the plant
leaf spot discoloured, often ± necrotic, generally not galled, sign of a fungus infection
miner-borer: larve initially makes a mine, lives as a borer later
pustule: plug of fungal tissue, generally brown-black and < 2 mm
stripe: longitudinal line of fungal tissue in a grass leaf
vagrant: (aphids, mites) living freely on the plant, at higher densitiy causing malformations.


The host plant spectre of a parasite is rarely known exhaustively; this applies in particular at the species level. It is advisable therefore to check at least also the list of all parasites of this genus.


mod 8.i.2019