yorkshire-fog

synonym: Holcus argenteus, glaucus

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Eriophyidae Abacarus acutatus
leaf stripe Ustilaginales Ustilago salveii
leaf vagrant summer generation Aphididae Melanaphis pyraria
leaf vagrant summer generation Aphididae Rhopalosiphum nymphaeae
leaf gall Peronosporales Sclerophthora macrospora
leaf miner older larva Coleophoridae Coleophora lixella
stem gall Cecidomyiidae Mayetiola destructor
leaf vagrant summer generation Aphididae Rhopalosiphum padi
leaf vagrant Aphididae Schizaphis graminum
systemic borer Anguinidae Ditylenchus dipsaci
fruit gall Hypocreales Claviceps purpurea
fruit gall Tilletiales Tilletia controversa
flower gall Tilletiales Tilletia holci
leaf down Erysiphales Erysiphaceae Blumeria graminis
leaf leaf spot Georgefischeriales Jamesdicksonia dactylidis
leaf gall Anguinidae Anguina graminis
leaf gall Eriophyidae Abacarus hystrix
leaf gall Eriophyidae Aceria tenuis
leaf miner Agromyzidae Agromyza nigripes
leaf miner Agromyzidae Cerodontha denticornis
leaf miner Agromyzidae Cerodontha flavocingulata
leaf miner Agromyzidae Cerodontha incisa
leaf miner Agromyzidae Cerodontha pygmaea
leaf miner Agromyzidae Chromatomyia fuscula
leaf miner Agromyzidae Chromatomyia milii
leaf miner Agromyzidae Chromatomyia nigra
leaf miner Agromyzidae Liriomyza flaveola
leaf miner Agromyzidae Liriomyza phryne
leaf miner Elachistidae Elachista albifrontella
leaf miner Elachistidae Elachista argentella
leaf miner Elachistidae Elachista humilis
leaf miner Elachistidae Elachista nobilella
leaf miner Elachistidae Elachista pullicomella
leaf miner Elachistidae Elachista subocellea
leaf pustule Cantharellales Ceratorhiza rhizodes
leaf pustule uredinia telia Pucciniales Puccinia coronata
leaf pustule uredinia telia Pucciniales Puccinia holcicola
leaf pustule uredinia telia Pucciniales Puccinia holcina
leaf stripe Microbotryales Ustilentyloma brefeldii
leaf stripe uredinia telia Pucciniales Puccinia striiformis
leaf vagrant summer generation Aphididae Sitobion fragariae
stem down Hypocreales Epichloe clarkii
stem gall main Aphididae Diuraphis holci
stem gall Cecidomyiidae Mayetiola holci
stem gall Chloropidae Oscinella nitidissima
stem vagrant Aphididae Laingia psammae
root gall Anguinidae Subanguina radicicola
inquiline Eriophyidae Aculodes dubius
leaf vagrant Aphididae Atheroides serrulatus
leaf vagrant Aphididae Sipha maydis
leaf vagrant Aphididae Sitobion avenae
leaf vagrant Aphididae Schizaphis holci

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 16.ix.2019