organ parasitic mode stage note taxonomic group parasite
root borer larva Brachyceridae Brachycerus foveicollis
root borer Syrphidae Merodon armipes
root borer Syrphidae Merodon aureus
root borer Syrphidae Merodon avidus
systemic borer Anguinidae Ditylenchus dipsaci
flower gall Urocystidales Antherospora vaillantii
leaf leaf spot Capnodiales Heterosporium ornithogali
leaf pustule Chytridiales Synchytrium niesslii
leaf pustule aecia Pucciniales Puccinia hordei
leaf pustule telia Pucciniales Puccinia liliacearum
leaf pustule telia Pucciniales Puccinia lojkaiana
leaf pustule telia Pucciniales Uromyces acutatus
leaf pustule telia Pucciniales Uromyces gageae
leaf pustule Urocystidales Urocystis ornithogali
leaf pustule Ustilaginales Vankya ornithogali

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.

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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 1.vii.2019