marsh lousewort

organ parasitic mode stage note taxonomic group parasite
flower vagrant Tortricidae Endothenia marginana
stem borer Tortricidae Gynnidomorpha minimana
fruit borer Tortricidae Gynnidomorpha permixtana
stem borer Agromyzidae Phytomyza diversicornis
fruit borer Agromyzidae Phytomyza tenella
leaf down Erysiphales Podosphaera phtheirospermi
leaf down Peronosporales Plasmopara densa
leaf gall Eriophyidae Aculops pedicularis
leaf miner Agromyzidae Phytomyza pedicularifolii
leaf pustule Chytridiales Synchytrium aureum
leaf pustule aecia Pucciniales Puccinia paludosa
leaf pustule uredinia telia Pucciniales Coleosporium euphrasiae
leaf pustule uredinia telia Pucciniales Cronartium flaccidum
leaf pustule telia Pucciniales Puccinia clintonii

Organ

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.

PARASITIC MODE

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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IMPORTANT

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 26.x.2019