marsh willowherb

organ parasitic mode stage note taxonomic group parasite
leaf hidden Tortricidae Clepsis spectrana
stem vagrant Aphididae Aphis craccivora
leaf vagrant summer generation rarely Aphididae Myzus lythri
systemic borer Anguinidae Ditylenchus dipsaci
fruit gall Momphidae Mompha subbistrigella
flower gall Cecidomyiidae Dasineura epilobii
leaf down Erysiphales Podosphaera epilobii
leaf down Peronosporales Plasmopara epilobii
leaf leaf spot Doassansiales Doassansia epilobii
leaf gall Aphididae Aphis pollinaria
leaf gall Eriophyidae Phyllocoptes epilobiorum
leaf miner Momphidae Mompha epilobiella
leaf miner Momphidae Mompha locupletella
leaf miner Momphidae Mompha propinquella
leaf pustule Chytridiales Synchytrium aureum
leaf pustule aecia Pucciniales Caeoma epilobii-alpini
leaf pustule aecia uredinia telia Pucciniales Puccinia pulverulenta
leaf pustule uredinia telia Pucciniales Puccinia varelae
leaf pustule uredinia telia Pucciniales Pucciniastrum epilobii
leaf pustule telia Pucciniales Puccinia epilobii
stem gall Asterolecaniidae Planchonia arabidis
stem gall Momphidae Mompha divisella
leaf gall rarely Aphididae Aphis epilobiaria
leaf vagrant Aphididae Aphis praeterita
stem vagrant Aphididae Macrosiphum tinctum
flower gall Aphididae Aphis epilobii


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 6.xii.2019