organ parasitic mode stage note taxonomic group parasite
leaf vagrant Aphididae Macrosiphum euphorbiae
stem vagrant Aphididae Aphis craccivora
leaf borer doubtful Agromyzidae Ophiomyia beckeri
leaf down Erysiphales Golovinomyces valerianae
leaf down Peronosporales Peronospora centranthi
leaf gall Triozidae Trioza centranthi
leaf miner Agromyzidae Liriomyza bryoniae
leaf miner Agromyzidae Liriomyza strigata
leaf miner Agromyzidae Liriomyza trifolii
leaf miner Agromyzidae Liriomyza valerianae
leaf miner Agromyzidae Liriomyza xanthocera
leaf pustule aecia Pucciniales Puccinia cynodontis
leaf pustule aecia Pucciniales Endophyllum centranthi-rubri
leaf vagrant summer generation Aphididae Aphis fabae
stem vagrant summer generation Aphididae Macrosiphum rosae
systemic vagrant summer generation Aphididae Aphis spiraephaga
leaf vagrant Aphididae Myzus ornatus
leaf vagrant Aphididae Aphis spiraecola
leaf vagrant Aphididae Macrosiphum centranthi
leaf vagrant summer generation Aphididae Aphis fabae fabae
leaf vagrant summer generation Aphididae Aphis fabae solanella

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 4.iv.2018