Plant Parasites of Europe

leafminers, galls and fungi

Glebionis segetum

corn marigold

synonym: Chrysanthemum segetum

organ parasitic mode stage note taxonomic group parasite
leaf scale Aleyrodidae Bemisia tabaci
unknown unknown Thripidae Thrips mareoticus
flower predator Aeolothripidae Aeolothrips collaris
leaf hidden Thripidae Thrips angusticeps
leaf hidden Thripidae Thrips tabaci
flower predator Phlaeothripidae Haplothrips reuteri
flower hidden Phlaeothripidae Haplothrips leucanthemi
unknown unknown Phlaeothripidae Haplothrips bluncki
leaf leaf spot Capnodiales Ramularia bellunensis
leaf vagrant Miridae Megalocoleus lunula
leaf vagrant Miridae Conostethus venustus
leaf vagrant Miridae Megalocoleus krueperi
root borer Cerambycidae Phytoecia nigricornis
leaf hidden Tortricidae Epichoristodes acerbella
flower borer larva doubtful Apionidae Diplapion detritum
stem borer larva doubtful Curculionidae Microplontus triangulum
leaf vagrant Aphididae Macrosiphoniella tapuskae
leaf vagrant Aphididae Aphis gossypii
leaf vagrant summer generation Aphididae Aphis fabae
fruit gall Cecidomyiidae Ozirhincus anthemidis
leaf down Erysiphales Golovinomyces macrocarpus
leaf down Peronosporales Peronospora radii
leaf leaf spot Entylomatales Entyloma scalianum
leaf pustule uredinia telia Pucciniales Puccinia balsamitae
leaf pustule uredinia telia Pucciniales Coleosporium senecionis
leaf pustule uredinia telia Pucciniales Puccinia chrysanthemicola
leaf pustule telia Pucciniales Puccinia anthemidis
stem vagrant rarely Aphididae Uroleucon sonchi


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 8.ii.2024