Oat

In Great Britain and/or Ireland:
Foodplant / feeds on
Ascochyta coelomycetous anamorph of Ascochyta avenae feeds on Avena

Foodplant / spot causer
immersed pycnidium of Ascochyta coelomycetous anamorph of Ascochyta avenae var. avenae causes spots on leaf of seedling of Avena
Other: major host/prey

Foodplant / spot causer
immersed pycnidium of Actinothyrium coelomycetous anamorph of Ascochyta avenae var. confusa causes spots on leaf of Avena

Foodplant / spot causer
pycnidium of Actinothyrium coelomycetous anamorph of Ascochyta leptospora causes spots on leaf of Avena

Foodplant / internal feeder
larva of Cephus pygmeus feeds within stem of Avena

Foodplant / parasite
Sphacelia anamorph of Claviceps purpurea parasitises inflorescence of Avena
Remarks: season: 7

Foodplant / saprobe
colony of Dictyosporium dematiaceous anamorph of Dictyosporium elegans is saprobic on stubble of Avena

Foodplant / open feeder
larva of Dolerus haematodes grazes on leaf of Avena

Foodplant / parasite
colony of Drechslera dematiaceous anamorph of Drechslera avenacea parasitises live Avena

Foodplant / saprobe
colony of Drechslera dematiaceous anamorph of Drechslera biseptata is saprobic on dead inflorescence of Avena

Foodplant / saprobe
colony of Drechslera dematiaceous anamorph of Drechslera dematioidea is saprobic on dead leaf of Avena

Foodplant / saprobe
Entophlyctis aurea is saprobic on submerged leaf of Avena

Plant / resting place / on
male of Frankliniella tenuicornis may be found on live Avena
Remarks: season: 7-9

Foodplant / pathogen
immersed, mycelial matted perithecium of Gaeumannomyces graminis var. avenae infects and damages dead stem base of Avena
Remarks: season: 3-10

Foodplant / pathogen
Fusarium anamorph of Gibberella zeae infects and damages stem base of Avena

Foodplant / feeds on
larva of Limothrips denticornis feeds on live floret of Avena
Remarks: season: 7-8
Other: major host/prey

Foodplant / pathogen
Fusarium anamorph of Monographella nivalis infects and damages leaf sheath (usually close to stem base) of Avena

Foodplant / saprobe
immersed pseudothecium of Mycosphaerella allicina is saprobic on Avena

Foodplant / spot causer
crowded, arranged in rows or scattered, immersed, minute, fuscous pycnidium of Septoria coelomycetous anamorph of Mycosphaerella graminicola causes spots on live leaf of Avena
Remarks: season: summer

Foodplant / saprobe
pycnidium of Hendersonia coelomycetous anamorph of Phaeosphaeria vagans is saprobic on dead stem of Avena

Foodplant / feeds on
larva of Phalacrus corruscus feeds on Avena

Foodplant / internal feeder
larva of Pseudonapomyza atra feeds within leaf of Avena
Other: major host/prey

Foodplant / spot causer
immersed, crowded or in rows pycnidium of Pseudoseptoria coelomycetous anamorph of Pseudoseptoria donacis causes spots on sheath of Avena
Remarks: season: 5-7

Foodplant / spot causer
colony of Drechslera dematiaceous anamorph of Pyrenophora chaetomioides causes spots on live leaf of Avena

Foodplant / sap sucker
Rhopalosiphum insertum sucks sap of live Avena
Remarks: season: summer

Foodplant / spot causer
immersed stromatic of Rhynchosporium coelomycetous anamorph of Rhynchosporium secalis causes spots on live sheath of Avena

Foodplant / spot causer
scattered, immersed, punctiform, blackish pycnidium of Septoria coelomycetous anamorph of Septoria affinis causes spots on leaf of Avena
Remarks: season: 9

Foodplant / pathogen
immersed stroma of Pseudocercosporella dematiaceous anamorph of Tapesia yallundae infects and damages live stem of Avena

Foodplant / pathogen
embedded sorus of Ustilago hordei infects and damages live spikelet of Avena

Foodplant / feeds on
larva of Zabrus tenebrioides feeds on Avena