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| Subject | English | Danish |
| med. | Alder anomalia of granulation | Alder-Reilly's syndrom |
| nat.sc., agric. | alder buckthorn | tørst (Rhamnus frangula) |
| bot. | alder buckthorn | tørst (Frangula alnus Mill.; Rhamnus frangula L.) |
| nat.sc., agric. | alder bud moth | birkesækmøl (Coleophora fuscedinella) |
| life.sc., agric. | alder froghopper | elleskumcikade (Aphrophora alni (Fall.)) |
| nat.res., agric. | alder leaf-beetle | ellebladbille (Agelastica alni) |
| life.sc., agric. | alder leaf-gall mite | ellebladgalmide (Eriophyes laevis (Nal.)) |
| life.sc., agric. | alder moth | elleugle (Acronicta alni (L.)) |
| life.sc., agric. | alder psyllid | ellebladloppe (Psylla alni (L.)) |
| forestr. | alder-tree | el (Alnus spp.) |
| life.sc., agric. | alder wood wasp | kamelhveps (Xiphydria camelus (L.)) |
| agric. | ash-alder wood | alluvial skov |
| agric. | speckled alder mildew | gråelmeldug (Erysiphe vernalis) |