Foodplant / miner
larva of Agromyza ambigua mines leaf of Avena sativa
Other: major host/prey

In Great Britain and/or Ireland:
Foodplant / parasite
Blumeria graminis parasitises live Avena sativa

Foodplant / internal feeder
larva of Cephus pygmeus feeds within stem of Avena sativa
Other: major host/prey

Foodplant / saprobe
Chytriomyces nodulatus is saprobic on submerged leaf of Avena sativa
Remarks: captive: in captivity, culture, or experimentally induced

Foodplant / saprobe
internal Diplophlyctis intestina is saprobic on stem of Avena sativa
Remarks: captive: in captivity, culture, or experimentally induced

Foodplant / parasite
internal Diplophlyctis laevis parasitises moribund leaf fragment of Avena sativa
Remarks: captive: in captivity, culture, or experimentally induced

Foodplant / pathogen
colony of Fusarium anamorph of Fusarium poae infects and damages pink-stained ear of Avena sativa

Foodplant / sap sucker
Macrosiphum avenae sucks sap of live Avena sativa

Foodplant / miner
larva of Oscinella frit mines live leaf of Avena sativa

Foodplant / feeds on
adult of Oulema melanopus/rufocyanea agg. feeds on leaf of Avena sativa
Remarks: season: 1-12
Other: major host/prey

Foodplant / feeds on
adult of Oulema septentrionis feeds on Avena sativa
Remarks: season: 4-6,8,10,12

Foodplant / spot causer
immersed pseudothecium of Phaeosphaeria avenaria f.sp. avenaria causes spots on live leaf of Avena sativa

Foodplant / pathogen
Pseudocercosporella herpotrichoides var. acuformis infects and damages Avena sativa

Foodplant / parasite
hypophyllous telium of Puccinia coronata parasitises live leaf of Avena sativa
Remarks: season: mid 8-

Foodplant / parasite
linear telium of Puccinia graminis f.sp. avenae parasitises live sheath of Avena sativa

Foodplant / pathogen
perithecium of Pyrenophora seminiperda infects and damages seed of Avena sativa
Remarks: captive: in captivity, culture, or experimentally induced

Plant / resting place / on
male of Rhipidothrips gratiosus may be found on live Avena sativa
Remarks: season: 6-7

Foodplant / sap sucker
Rhopalosiphum padi sucks sap of Avena sativa

Foodplant / pathogen
sorus of Ustilago avenae infects and damages live ovary of Avena sativa
Other: minor host/prey