synonym: Chrysanthemum japonicum

organ parasitic mode stage note taxonomic group parasite
leaf miner Agromyzidae Chromatomyia horticola
leaf vagrant Aphididae Macrosiphum euphorbiae
flower gall Cecidomyiidae Ozirhincus longicollis
leaf vagrant summer generation Aphididae Brachycaudus helichrysi
leaf gall doubtful Triozidae Trioza chrysanthemi
leaf vagrant summer generation Aphididae Aphis fabae
leaf down Erysiphales Euoidium chrysanthemi
leaf down Erysiphales Golovinomyces orontii
leaf gall Aphelenchoididae Aphelenchoides fragariae
leaf gall Cecidomyiidae Rhopalomyia chrysanthemi
leaf miner Agromyzidae Chromatomyia syngenesiae
leaf miner Agromyzidae Phytomyza leucanthemi
leaf miner Tephritidae Trypeta artemisiae
leaf miner Tephritidae Trypeta zoe
leaf pustule uredinia telia Pucciniales Puccinia chrysanthemi
leaf pustule telia Pucciniales Puccinia horiana
stem gall Rhizobiales Agrobacterium tumefaciens
root collar gall Actinomycetales Rhodococcus fascians
leaf vagrant Aphididae Aphis gossypii
leaf vagrant Aphididae Coloradoa rufomaculata
leaf vagrant Aphididae Macrosiphoniella oblonga
leaf vagrant Aphididae Macrosiphoniella sanborni
leaf gall Aphididae Macrosiphoniella tanacetaria


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 1.vii.2019