Plant Parasites of Europe

leafminers, galls and fungi

Juglans regia

walnut

organparasitic modestagenotetaxonomic groupparasite
stemvagrantFlatidaeMetcalfa pruinosa
stemscalePseudococcidaePhenacoccus aceris
stemscaleDiaspididaeDiaspidiotus perniciosus
leafhiddenTortricidaeArchips xylosteana
fruitborerrarelyTortricidaeCydia splendana
fruitborerdoubtfulTortricidaeCydia pomonella
stemgallHypocrealesNeonectria ditissima
leafvagrantTenuipalpidaeBrevipalpus obovatus
leafvagrantDiptilomiopidaeApodiptacus cordiformis
leafvagrantEriophyidaeShevtchenkella juglandis
leafvagrantEriophyidaeAculus arzakanensis
leafvagrantEriophyidaeAculus fascigrans
leafvagrantEriophyidaeAculus juglandis
leafvagrantEriophyidaeAculus pulaviensis
leafvagrantEriophyidaeAculus marinkovici
leafvagrantEriophyidaeAculus nigrus
stemvagrantAphididaeStomaphis quercus
leafgallEriophyidaeAceria brachytarsus
stemscaleDiaspididaeLepidosaphes ulmi
stemscaleDiaspididaeLepidosaphes conchiformis
stemscaleCoccidaeEulecanium tiliae
stemborerSesiidaeSynanthedon vespiformis
leafvagrantTenuipalpidaeCenopalpus pulcher
stemvagrantAphididaeStomaphis juglandis
root collarvagrantAphididaeStomaphis wojciechowskii
fruitgallTephritidaeRhagoletis completa
leafdownMicrostromatalesPseudomicrostroma juglandis
leafgallEriophyidaeAceria avanensis
leafgallEriophyidaeAceria erinea
leafgallEriophyidaeAceria tristriata
leafminerGracillariidaeCaloptilia roscipennella
leafminerHeliozelidaeCoptodisca lucifluella
leafvagrantAphididaeChromaphis juglandicola
leafvagrantAphididaePanaphis juglandis
leafvagrantEriophyidaeAculops unguiculatus
leafvagrantEriophyidaePhyllocoptes juglandivagrans
stemscaleDiaspididaeEpidiaspis leperii
stemgallSantalaceaeViscum album
stemscaleCoccidaeParthenolecanium corni
leafleaf spotDiaporthalesOphiognomonia leptostyla

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.

 

Last modified 26.v.2020