Walstein’s spurge

synonym: Euphorbia tommasiniana, uralensis, virgata, virgultosa, waldsteinii

organ parasitic mode stage note taxonomic group parasite
leaf bud hidden Thripidae Anaphothrips euphorbiae
flower vagrant Aphididae Aphis esulae
root borer doubtful Sesiidae Chamaesphecia tenthrediniformis
root borer Sesiidae Chamaesphecia crassicornis
stem borer Curculionidae Thamnurgus euphorbiae
fruit gall Cecidomyiidae Dasineura capsulae
flower gall Cecidomyiidae Euphorbomyia loewii
leaf bud gall Cecidomyiidae Spurgia euphorbiae
leaf down Erysiphales Podosphaera euphorbiae
leaf down Peronosporales Peronospora euphorbiae
leaf pustule aecia Pucciniales Aecidium euphorbiae
leaf pustule aecia Pucciniales Uromyces caraganicola
leaf pustule aecia Pucciniales Uromyces fischeri-eduardi
leaf pustule aecia Pucciniales Uromyces pisi
leaf pustule aecia Pucciniales Uromyces punctatus
leaf pustule aecia Pucciniales Uromyces striatus
leaf pustule aecia uredinia telia Pucciniales Melampsora euphorbiae
leaf pustule aecia uredinia telia Pucciniales Melampsora euphorbiae-dulcis
leaf pustule telia Pucciniales Uromyces scutellatus
stem borer Anthomyiidae Pegomya curticornis
root collar gall Anthomyiidae Pegomya euphorbiae
leaf vagrant Aphididae Acyrthosiphon cyparissiae

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 21.xi.2019