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In Great Britain and/or Ireland:
Foodplant / parasite
colony of Albugo candida parasitises live, discoloured, distorted leaf of Brassica
Remarks: season: spring, early autumn
Other: major host/prey

Foodplant / sap sucker
hypophyllous adult of Aleyrodes proletella sucks sap of leaf of Brassica
Other: sole host/prey

Foodplant / spot causer
amphigenous colony of Alternaria dematiaceous anamorph of Alternaria brassicae causes spots on live leaf of Brassica

Foodplant / spot causer
epiphyllous, densely crowded, black pycnidium of Ascochyta coelomycetous anamorph of Ascochyta brassicae causes spots on live leaf of Brassica

Foodplant / feeds on
larva of Baris laticollis feeds on Brassica

Foodplant / sap sucker
dense, wet (honeydew) colony of Brevicoryne brassicae sucks sap of live leaf of Brassica
Remarks: season: (7-)9-10...
Other: major host/prey

Foodplant / spinner
caterpillar of Cacoecimorpha pronubana spins live leaf of Brassica
Other: major host/prey

Foodplant / pathogen
Cauliflower Mosaic virus infects and damages live, stunted leaf of Brassica

Foodplant / gall
larva of Ceutorhynchus assimilis causes gall of live root of Brassica
Remarks: season: 3-

Foodplant / feeds on
larva of Ceutorhynchus hepaticus feeds on Brassica

Foodplant / gall
larva of Ceutorhynchus pleurostigma causes gall of stem (base) of Brassica

Plant / resting place / within
puparium of Chromatomyia horticola may be found in leaf-mine (end of) of Brassica

Foodplant / gall
larva of Dasineura brassicae causes gall of pod of Brassica

Foodplant / pathogen
colony of Erwinia carotovora infects and damages Brassica
Other: major host/prey

Foodplant / gall
Heterodera cruciferae causes gall of cysted root of Brassica

Plant / resting place / on
adult of Melanthrips fuscus may be found on live flower of Brassica
Remarks: season: 5-9

Foodplant / feeds on
larva of Meligethes aeneus feeds on live flower bud pollen of Brassica

Foodplant / feeds on
larva of Meligethes viridescens feeds on live flower bud pollen of Brassica

Foodplant / sap sucker
Myzus ascalonicus sucks sap of Brassica

Foodplant / sap sucker
Myzus cerasi sucks sap of live, distorted leaf of Brassica
Remarks: season: summer

Foodplant / parasite
Olpidium brassicae parasitises live root of Brassica

Foodplant / saprobe
cleistothecium of Perisporium kunzei is saprobic on old, dead stalk of Brassica
Remarks: season: 4-5

Foodplant / parasite
colony of sporangium of Peronospora parasitica parasitises live Brassica
Remarks: season: 1-4

Foodplant / open feeder
larva of Phaedon cochleariae grazes on live leaf of Brassica
Remarks: season: -early 9

Foodplant / saprobe
scattered, covered then bursting through a slit pycnidium of Phomopsis coelomycetous anamorph of Phomopsis cruciferae is saprobic on dead stalk of Brassica
Remarks: Other: uncertain

Foodplant / open feeder
imago of Phyllotreta aerea grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta atra grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta consobrina grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta cruciferae grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta nemorum grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta nigripes grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta striolata grazes on leaf of Brassica

Foodplant / open feeder
imago of Phyllotreta undulata grazes on leaf of Brassica

Plant / resting place / on
puparium of Phytomyza rufipes may be found on leaf of Brassica
Other: major host/prey

Foodplant / open feeder
caterpillar of Pieris brassicae grazes on live leaf of Brassica

Foodplant / gall
Plasmodiophora brassicae causes gall of swollen, distorted, often fused root of Brassica
Other: major host/prey

Foodplant / web feeder
hypophyllous, nocturnal, web-inhabiting caterpillar of Plutella xylostella feeds from web on live leaf of Brassica

Foodplant / spot causer
amphigenous Pseudocercosporella anamorph of Pseudocercosporella brassicae causes spots on live leaf of Brassica
Other: minor host/prey

Foodplant / saprobe
almost sessile or shortly stalked apothecium of Pseudombrophila deerrata is saprobic on rotting stem of Brassica
Remarks: season: 5-11

Foodplant / spot causer
colony of Pseudomonas syringae pv. maculicola causes spots on live leaf of Brassica
Other: major host/prey

Foodplant / open feeder
imago of Psylliodes chrysocephala grazes on leaf of Brassica

Foodplant / saprobe
effuse colony of Scopulariopsis dematiaceous anamorph of Scopulariopsis brevicaulis is saprobic on rotting stalk of Brassica

Foodplant / sap sucker
Smynthurodes betae sucks sap of root of Brassica
Other: major host/prey

Foodplant / feeds on
adult of Thrips tabaci feeds on live leaf of Brassica

Foodplant / pathogen
Turnip Crinkle virus infects and damages live, mottled leaf of Brassica

Foodplant / pathogen
Xanthomonas campestris pv. campestris infects and damages live, yellow-blotched leaf of Brassica
Other: major host/prey