Plant Parasites of Europe

leafminers, galls and fungi

Cannabis sativa

hemp

synonym: Cannabis sativa subsp. spontanea

organ parasitic mode stage note taxonomic group parasite
stem scale Coccidae Ceroplastes rusci
seeds vagrant Carabidae Harpalus rufipes
flower predator Aeolothripidae Aeolothrips fasciatus
Thripidae Oxythrips cannabensis
flower hidden Thripidae Chirothrips manicatus
flower hidden Thripidae Frankliniella intonsa
stem borer Mordellidae Mordellistena parvula
stem kanker Didymellaceae Neodidymelliopsis cannabis
stem kanker Pleosporales Phoma herbarum
leaf leaf spot Didymellaceae Didymella arcuata
leaf leaf spot Didymellaceae Ascochyta arcuata
leaf leaf spot Pleosporales Boeremia exigua
leaf leaf spot Mycosphaerellaceae Septoria cannabina
leaf leaf spot Mycosphaerellaceae Septoria cannabis
leaf leaf spot doubtful Capnodiales Ramularia collo-cygni
leaf vagrant Rhopalidae Liorhyssus hyalinus
leaf vagrant adult Curculionidae Phyllobius pomaceus
root vagrant Noctuidae Agrotis ipsilon
stem borer Cerambycidae Agapanthiola leucaspis
leaf vagrant Nymphalidae Aglais urticae
leaf vagrant Sphingidae Acherontia atropos
stem borer Curculionidae Thamnurgus caucasicus
root collar gall rarely Curculionidae Ceutorhynchus assimilis
root vagrant Chrysomelidae Psylliodes attenuata
leaf hidden Crambidae Loxostege sticticalis
leaf vagrant Tenthredinidae Trichiocampus cannabis
stem borer Tortricidae Grapholita delineana
leaf miner Agromyzidae Chromatomyia horticola
leaf vagrant Aphididae Aphis gossypii
leaf vagrant summer generation Aphididae Aphis fabae
systemic borer Anguinidae Ditylenchus dipsaci
flower gall Aphididae Phorodon cannabis
leaf down Erysiphales Podosphaera macularis
leaf down Peronosporales Pseudoperonospora cannabina
leaf miner rarely Agromyzidae Agromyza reptans
leaf miner Agromyzidae Liriomyza cannabis
leaf miner Agromyzidae Liriomyza strigata
leaf pustule aecia Pucciniales Aecidium cannabis
leaf pustule uredinia Pucciniales Uredo kriegeriana
leaf vagrant Eriophyidae Aculops cannabicolus
root gall Heteroderidae Heterodera humuli

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.

 

Last modified 4.ii.2024