scentless mayweed

organ parasitic mode stage note taxonomic group parasite
root borer larva Curculionidae Cyphocleonus dealbatus
flower borer larva Curculionidae Pseudostyphlus pillumus
flower borer larva Apionidae Omphalapion dispar
flower borer larva Apionidae Diplapion detritum
stem vagrant doubtful Aphididae Uroleucon sonchi
root vagrant Aphididae Trama troglodytes
leaf vagrant summer generation Aphididae Aphis fabae fabae
flower gall doubtful Tephritidae Tephritis nigricauda
systemic borer Anguinidae Ditylenchus dipsaci
fruit gall Cecidomyiidae Ozirhincus hungaricus
flower borer Tephritidae Trupanea stellata
flower gall Apionidae Omphalapion hookerorum
flower gall Apionidae Omphalapion laevigatum
flower gall Cecidomyiidae Ozirhincus longicollis
flower gall Cecidomyiidae Rhopalomyia syngenesiae
leaf bud gall Cecidomyiidae Rhopalomyia tripleurospermi
leaf down Erysiphales Golovinomyces macrocarpus
leaf down Erysiphales Podosphaera erigerontis-canadensis
leaf down Peronosporales Paraperonospora leptosperma
leaf down Peronosporales Peronospora radii
leaf leaf spot Entylomatales Entyloma matricariae
leaf gall Taphrinales Protomyces matricariae
leaf miner Agromyzidae Chromatomyia syngenesiae
leaf pustule uredinia telia Pucciniales Puccinia balsamitae
leaf pustule uredinia telia doubtful Pucciniales Puccinia absinthii
leaf pustule telia Pucciniales Puccinia anthemidis
leaf vagrant Aphididae Coloradoa inodorella
leaf vagrant rarely Aphididae Metopeurum fuscoviride
leaf vagrant summer generation Aphididae Aphis fabae
stem borer main Agromyzidae Napomyza lateralis
stem borer Agromyzidae Ophiomyia curvipalpis
stem borer Curculionidae Microplontus rugulosus
root gall Apionidae Diplapion confluens
root gall Meloidogynidae Meloidogyne hapla
leaf vagrant summer generation Aphididae Brachycaudus helichrysi
leaf vagrant summer generation Aphididae Brachycaudus cardui
root vagrant Aphididae Pemphigus fuscicornis
leaf vagrant Aphididae Aulacorthum solani
stem vagrant rarely Aphididae Acyrthosiphon pisum
root collar vagrant Aphididae Brachycaudus lateralis
leaf vagrant Aphididae Macrosiphoniella tapuskae
leaf gall Aphididae Macrosiphoniella tanacetaria
stem vagrant Aphididae Macrosiphoniella abrotani

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.

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 10.v.2019