Plant Parasites of Europe

leafminers, galls and fungi

Chaenomeles japonica

japenese quince

synonym: Chaenomeles, Cydonia, maulei

organ parasitic mode stage note taxonomic group parasite
stem scale Diaspididae Comstockaspis perniciosa
scale Diaspididae Melanaspis inopinata
leaf vagrant Tingidae Stephanitis pyri
leaf leaf spot Dothideomycetes Asteromella bacilloides
leaf vagrant adult Curculionidae Phyllobius pilicornis
stem scale Coccidae Ceroplastes japonicus
leaf vagrant Aphididae Macrosiphum euphorbiae
leaf vagrant Noctuidae Acronicta psi
leaf vagrant Geometridae Opisthograptis luteolata
leaf vagrant Geometridae Chloroclysta siterata
leaf hidden Tortricidae Ancylis tineana
leaf vagrant Tenthredinidae Pristiphora insularis
leaf vagrant Aphididae Aphis gossypii
leaf vagrant Aphididae Aphis spiraecola
leaf down doubtful Erysiphales Podosphaera leucotricha
leaf miner Gracillariidae Phyllonorycter corylifoliella
leaf miner Gracillariidae Phyllonorycter sorbi
leaf miner Lyonetiidae Leucoptera malifoliella
leaf miner Lyonetiidae Lyonetia clerkella
leaf miner Lyonetiidae Lyonetia prunifoliella
leaf pustule aecia Pucciniales Gymnosporangium confusum
leaf gall Aphididae Aphis pomi


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.


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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.


Last modified 23.v.2023