organ parasitic mode stage note taxonomic group parasite
stem borer Curculionidae Aulacobaris lepidii
root scale Coccidae Rhizopulvinaria artemisiae
fruit gall Urocystidales Thecaphora thlaspeos
flower gall Eriophyidae Aceria drabae
leaf down Erysiphales Erysiphe cruciferarum
leaf down Peronosporales Peronospora alyssi-calycini
leaf gall Curculionidae Ceutorhynchus leprieuri
leaf miner Agromyzidae Liriomyza alyssi
leaf miner Agromyzidae Liriomyza strigata
leaf miner Coleophoridae Coleophora kautzi
leaf miner Coleophoridae Coleophora telonica
leaf miner Curculionidae Ceutorhynchus minutus
leaf miner Drosophilidae Scaptomyza flava
leaf miner Plutellidae Lunakia alyssella
leaf miner Plutellidae Plutella xylostella
leaf miner Psychidae Apterona helicoidella
leaf pustule Albuginales Albiginaceae Albugo candida
leaf pustule telia Pucciniales Puccinia alyssi
stem borer Curculionidae Aulacobaris lepidii
stem gall Asterolecaniidae Planchonia arabidis
stem gall Cecidomyiidae Dasineura alyssi
stem gall Cecidomyiidae Janetiella fallax
root collar gall Curculionidae Ceutorhynchus assimilis
root collar gall Plasmodiophorales Plasmodiophora brassicae

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.iv.2019