garden lettuce

organ parasitic mode stage note taxonomic group parasite
leaf down Erysiphales Golovinomyces bolayi
leaf scale Aleyrodidae Aleyrodes proletella
leaf scale Aleyrodidae Trialeurodes vaporariorum
leaf miner Agromyzidae Chromatomyia horticola
leaf vagrant summer generation Aphididae Brachycaudus helichrysi
leaf leaf spot doubtful Capnodiales Ramularia inaequalis
flower borer Anthomyiidae Botanophila gnava
leaf vagrant summer generation Aphididae Myzus persicae
leaf vagrant Aphididae Aulacorthum solani
systemic vagrant Aphididae Protaphis terricola
flower vagrant Aphididae Acyrthosiphon scariolae
leaf vagrant summer generation Aphididae Aphis fabae fabae
leaf vagrant summer generation Aphididae Aphis fabae
flower borer Tephritidae Trupanea amoena
flower gall Eriophyidae Aculus lactucae
leaf down Erysiphales Golovinomyces cichoracearum
leaf down Peronosporales Bremia lactucae
leaf miner Agromyzidae Chromatomyia syngenesiae
leaf miner Agromyzidae Liriomyza huidobrensis
leaf miner Agromyzidae Ophiomyia pinguis
leaf pustule aecia Pucciniales Puccinia opizii
leaf pustule aecia uredinia telia Pucciniales Puccinia chondrillae
leaf pustule aecia uredinia telia Pucciniales Puccinia lactucarum
root gall Meloidogynidae Meloidogyne hapla
root vagrant Aphididae Trama caudata
root vagrant summer generation Aphididae Pemphigus bursarius
leaf vagrant Aphididae Macrosiphum euphorbiae
leaf vagrant summer generation Aphididae Nasonovia ribisnigri
flower vagrant summer generation Aphididae Hyperomyzus lactucae
stem vagrant Aphididae Uroleucon cichorii
stem vagrant Aphididae Acyrthosiphon lactucae
leaf vagrant Aphididae Myzus cymbalariae
stem vagrant Aphididae Uroleucon sonchi

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.

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 16.iii.2019