hairy st john’s-wort

organ parasitic mode stage note taxonomic group parasite
leaf hidden Depressariidae Agonopterix liturosa
flower gall Tortricidae Lathronympha strigana
stem borer Gelechiidae Eulamprotes atrella
stem borer larva Apionidae Pseudostenapion simum
fruit borer larva Apionidae Pseudoperapion brevirostre
root borer Sesiidae Chamaesphecia nigrifrons
leaf bud gall Cecidomyiidae Dasineura serotina
leaf down Erysiphales Erysiphe hyperici
leaf gall Cecidomyiidae Macrolabis marteli
leaf miner Gracillariidae Euspilapteryx auroguttella
leaf miner Lyonetiidae Leucoptera lustratella
leaf miner Nepticulidae Fomoria septembrella
leaf pustule aecia telia Pucciniales Melampsora hypericorum
leaf vagrant Eriophyidae Aculus hyperici


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 28.xii.2019