silvery yarrow

synonym: Ptarmica clavennae

organ parasitic mode stage note taxonomic group parasite
leaf bud gall Cecidomyiidae Rhopalomyia millefolii
leaf vagrant Triozidae Trioza achilleae
leaf gall Anguinidae Subanguina millefolii
leaf miner Agromyzidae Phytomyza tanaceti
leaf miner Bucculatricidae Bucculatrix clavenae
leaf miner Coleophoridae Coleophora follicularis
leaf miner Gelechiidae Scrobipalpa proclivella
leaf miner Tortricidae Cnephasia incertana
leaf pustule telia Pucciniales Puccinia millefolii
leaf vagrant Aphididae Macrosiphoniella usquertensis

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 19.vi.2019