Plant Parasites of Europe

leafminers, galls and fungi

genus Hydrangea

organ parasitic mode stage note taxonomic group parasite
stem vagrant Flatidae Metcalfa pruinosa
leaf scale Aleyrodidae Bemisia tabaci
flower hidden Thripidae Scirtothrips canizoi
leaf vagrant Tetranychidae Tetranychus urticae
scale Diaspididae Chrysomphalus dictyospermi
stem scale Diaspididae Aonidiella aurantii
leaf vagrant Tetranychidae Bryobia graminum
root vagrant larva Curculionidae Otiorhynchus rugosostriatus
systemic film Pythiaceae Globisporangium debaryanum
root film Plectosphaerellaceae Verticillium albo-atrum
root film Ceratobasidiaceae Rhizoctonia solani
leaf leaf spot Pleosporaceae Alternaria hortensiae
systemic down Sclerotiniaceae Botrytis cinerea
leaf leaf spot Sporidesmiaceae Sporidesmium hydrangeae
leaf leaf spot Pleosporales incertae sedis Phoma exigua var. exigua
leaf leaf spot Mycosphaerellaceae Septoria hydrangeae
leaf vagrant adult Curculionidae Sciaphilus asperatus
leaf vagrant adult Curculionidae Otiorhynchus rugosostriatus
leaf vagrant Tenuipalpidae Brevipalpus californicus
stem scale Margarodidae Icerya purchasi
leaf vagrant Noctuidae Lacanobia oleracea
leaf vagrant Thripidae Thrips setosus
flower hidden Thripidae Frankliniella intonsa
stem scale Coccidae Pulvinaria regalis
stem scale Diaspididae Lepidosaphes ulmi
leaf scale main Coccidae Pulvinaria hydrangeae
leaf vagrant Tenuipalpidae Cenopalpus pulcher
stem vagrant Aphididae Aphis aurantii
systemic borer Anguinidae Ditylenchus dipsaci
leaf down Erysiphales Golovinomyces orontii
leaf down Erysiphales Pseudoidium hortensiae
leaf vagrant Aphididae Aulacorthum solani
leaf vagrant Aphididae Macrosiphum euphorbiae


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.


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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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 10.ii.2024