organ parasitic mode stage note taxonomic group parasite
leaf vagrant Tortricidae Cacoecimorpha pronubana
leaf vagrant Phytoptidae Trisetacus cupressi
stem vagrant Eriophyidae Calepitrimerus occithujae
leaf scale Diaspididae Lineaspis striata
leaf scale Diaspididae Lepidosaphes juniperi
stem scale Pseudococcidae Planococcus vovae
leaf scale Diaspididae Carulaspis minima
leaf scale Diaspididae Carulaspis juniperi
leaf gall Phytoptidae Trisetacus thujae
leaf miner Yponomeutidae Argyresthia thuiella
leaf miner Yponomeutidae Argyresthia trifasciata
leaf vagrant Aphididae Cinara juniperi
leaf vagrant Eriophyidae Epitrimerus insons
stem vagrant main Aphididae Cinara cupressi
stem vagrant Aphididae Cinara tujafiina
stem scale main Coccidae Parthenolecanium fletcheri

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 22.x.2019