organ parasitic mode stage note taxonomic group parasite
leaf hidden Tortricidae Cnephasia incertana
leaf miner younger larva Tortricidae Cnephasia asseclana
leaf hidden older larva Tortricidae Cnephasia asseclana
leaf hidden doubtful Tortricidae Acleris shepherdana
leaf hidden Tortricidae Acleris aspersana
leaf vagrant Tortricidae Acleris caledoniana
unknown borer Syrphidae Cheilosia vicina
leaf vagrant larva Curculionidae Pelenomus commari
stem vagrant rarely Aphididae Acyrthosiphon pisum
leaf down Erysiphales Podosphaera aphanis
leaf down Peronosporales Peronospora alchemillae
leaf leaf spot Venturiales Coleroa alchemillae
leaf gall Triozidae Bactericera femoralis
leaf miner Agromyzidae Agromyza idaeiana
leaf miner Coleophoridae Coleophora potentillae
leaf miner Coleophoridae Coleophora rectilineella
leaf miner Incurvariidae Incurvaria praelatella
leaf pustule uredinia telia Pucciniales Trachyspora alchemillae
leaf pustule telia Pucciniales Trachyspora melospora
leaf pustule telia Pucciniales Trachyspora pentaphylleae
leaf vagrant Eriophyidae Calepitrimerus alchemillae
leaf vagrant Phytoptidae Phytoptus alchemillae
stem gall Asterolecaniidae Planchonia arabidis
leaf vagrant Aphididae Acyrthosiphon malvae potha
leaf vagrant Aphididae Aulacorthum solani
leaf vagrant Aphididae Aphis alchemillae
leaf vagrant rarely Aphididae Amphorophora gei
leaf vagrant Aphididae Myzus ascalonicus


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.


mod 9.xi.2019