Plant Parasites of Europe

leafminers, galls and fungi

Agave americana

century plant, american aloe

organ parasitic mode stage note taxonomic group parasite
flower hidden Thripidae Thrips hawaiiensis
leaf leaf spot Leptosphaeriaceae Coniothyrium concentricum
leaf kanker Nectriaceae Thyronectria concentrica
leaf scale Coccidae Coccus hesperidum
stem scale Coccidae Saissetia oleae
scale Diaspididae Pinnaspis strachani
stem borer Cerambycidae Parmena bicincta
stem borer Dryophthoridae Scyphophorus acupunctatus
leaf scale Eriococcidae Ovaticoccus agavium
leaf scale Eriococcidae Ovaticoccus exoticus
leaf scale Diaspididae Aspidiotus nerii


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 19.x.2023