ploughman’s-spikenard

synonym: Conyza squarrosa; Inula conyza, squarrosa (L.), vulgaris

organ parasitic mode stage note taxonomic group parasite
root borer Tortricidae Aethes tesserana
leaf vagrant Tenuipalpidae Brevipalpus recki
flower borer Ictericodes zelleri
flower borer Gelechiidae Ptocheuusa paupella
fruit borer Gelechiidae Apodia bifractella
stem borer spring generation Pterophoridae Hellinsia carphodactyla
flower borer summer generation Pterophoridae Hellinsia carphodactyla
stem borer Agromyzidae Melanagromyza eupatorii
leaf vagrant Aphididae Capitophorus inulae
flower borer Tephritidae Trupanea stellata
leaf down Capnodiales Ramularia cupulariae
leaf gall Cecidomyiidae Neomikiella beckiana
leaf miner Agromyzidae Liriomyza bryoniae
leaf miner Agromyzidae Phytomyza conyzae
leaf miner Anthomyiidae Phorbia incana
leaf miner Choreutidae Tebenna micalis
leaf miner Coleophoridae Coleophora conyzae
leaf miner Coleophoridae Coleophora follicularis
leaf miner Coleophoridae Coleophora inulae
leaf miner Coleophoridae Coleophora leucogrammella
leaf miner Crambidae Atralata albofascialis
leaf miner Glyphipterigidae Digitivalva granitella
leaf miner Glyphipterigidae Digitivalva occidentella
leaf miner Glyphipterigidae Digitivalva perlepidella
leaf miner Glyphipterigidae Digitivalva valeriella
leaf pustule Albuginales Pustula obtusata
leaf pustule uredinia telia Pucciniales Coleosporium inulae
stem gall Cecidomyiidae Acodiplosis inulae
leaf vagrant summer generation Aphididae Brachycaudus helichrysi
leaf vagrant summer generation Aphididae Capitophorus pakansus

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.

 

mod 22.x.2019