Plant Parasites of Europe

leafminers, galls and fungi

genus Crocus

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Thripidae Aptinothrips rufus
root scale Pseudococcidae Phenacoccus avenae
flower hidden Thripidae Taeniothrips picipes
flower hidden Thripidae Thrips minutissimus
leaf film Pythiaceae Globisporangium ultimum
root pustule Sclerotiniaceae Sclerotinia bulborum
stem down Nectriaceae Fusarium oxysporum
root film Helicobasidiaceae Helicobasidium purpureum
root film Ceratobasidiaceae Rhizoctonia solani
root down Typhulaceae Sclerotium tuliparum
systemic down Sclerotiniaceae Botrytis cinerea
leaf leaf spot Sclerotiniaceae Stromatinia gladioli
leaf leaf spot Mycosphaerellaceae Septoria gladioli
root borer Curculionidae Hoplopteridius lutosus
root borer Syrphidae Merodon cinereus
leaf pustule telia Pucciniales Puccinia croci
leaf pustule telia Pucciniales Uromyces croci
leaf stripe Urocystidales Urocystis gladiolicola
leaf vagrant summer generation Aphididae Rhopalosiphoninus staphyleae
root vagrant Aphididae Dysaphis tulipae
root vagrant Aphididae Rhopalosiphoninus latysiphon


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 12.i.2024