Plant Parasites of Europe

leafminers, galls and fungi

Psidium guajava

lemon guava

organ parasitic mode stage note taxonomic group parasite
flower hidden Thripidae Isoneurothrips australis
leaf vagrant Aphididae Greenidea ficicola
scale Coccidae Parasaissetia nigra
leaf scale Coccidae Protopulvinaria pyriformis
scale Coccidae Pulvinaria psidii
leaf scale Coccidae Saissetia coffeae
scale Diaspididae Chrysomphalus dictyospermi
scale Diaspididae Hemiberlesia lataniae
stem scale Margarodidae Icerya purchasi
stem scale Pseudococcidae Planococcus citri
stem scale Pseudococcidae Pseudococcus longispinus
leaf vagrant Cicadellidae Sophonia orientalis
leaf scale Aleyrodidae Aleurodicus floccissimus
leaf scale Aleyrodidae Paraleyrodes minei
leaf scale Aleyrodidae Acaudaleyrodes rachipora
leaf scale Aleyrodidae Aleurothrixus floccosus
leaf scale Aleyrodidae Bemisia tabaci
leaf scale Aleyrodidae Aleurodicus dispersus


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 14.xi.2023