Use of active compound combinations comprising prothioconazole and Fluxapyroxad as active ingredients for controlling corn/maize diseases caused by Acremonium strictum, Aspergillus flavus, Botryodiplodia theobromae, Botryosphaeria festucae, Cephalosporium acremonium, Cochliobolus eragrostidis, Cochliobolus intermedius, Cochliobolus lunatus, Cochliobolus pallescens, Cochliobolus tuberculatus, Colletotrichum graminicola, Corticium sasakii, Curvularia clavata, Curvularia eragrostidis, Curvularia inaequalis, Curvularia intermedia, Curvularia lunata, Curvularia maculans, Curvularia pallescens, Curvularia senegalensis, Curvularia tuberculata, Didymella exitalis, Diplodia frumenti, Diplodia macrospora, Diplodia maydis, Glomerella falcatum, Glomerella graminicola, Glomerella tucumanensis, Lasiodiplodia theobromae, Macrophomina phaseolina, Marasmiellus sp., Physoderma maydis, Rhizoctonia microsclerotia, Rhizoctonia solani, Stenocarpella macrospora, Thanatephorus cucumeris, Thanatephorus cucumeris; or by downy mildews selected from Alternaria alternata, Alternaria tenuis, Angiopsora zeae, Ascochyta ischaemi, Ascochyta maydis, Ascochyta tritici, Ascochyta zeicola, Aspergillus glaucus, Aspergillus niger, Aspergillus spp., Athelia rolfsii, Aureobasidium zeae, Bipolaris maydis, Bipolaris sorokiniana, Bipolaris victoriae, Bipolaris zeicola, Botryosphaeria festucae, Botryosphaeria zeae, Botryotinia fuckeliana, Botrytis cinerea, Cephalosporium maydis, Cephalotrichum stemonitis, Cercospora sorghi, Cercospora sorghi var. maydis, Cercospora zeae-maydis, Cladosporium cladosporioides, Cladosporium herbarum, Claviceps gigantea, Cochliobolus carbonum, Cochliobolus heterostrophus, Cochliobolus sativus, Cochliobolus victoriae, Cunninghamella sp., Curvularia pallescens, Dictochaeta fertilis, Diplodia frumenti, Diplodia macrospora, Diplodia maydis, Diplodia zeae, Doratomyces stemonitis, Drechslera prolata, Epicoccum nigrum, Exserohilum pedicellatum, Exserohilum prolatum, Exserohilum rostratum, Exserohilum turcicum, Fusarium acuminatum, Fusarium avenaceum, Fusarium culmorum, Fusarium episphaeria, Fusarium equiseti, Fusarium graminearum, Fusarium merismoides, Fusarium moniliforme, Fusarium moniliforme var. subglutinans, Fusarium oxysporum, Fusarium pallidoroseum, Fusarium poae, Fusarium roseum, Fusarium solani, Fusarium subglutinans, Fusarium sulphureum, Fusarium tricinctum, Gaeumannomyces graminis, Gibberella acuminata, Gibberella avenacea, Gibberella cyanogena, Gibberella fujikuroi, Gibberella intricans, Gibberella zeae, Gloeocercospora sorghi, Gonatobotrys simplex, Graphium penicillioides, Helminthosporium carbonum, Helminthosporium maydis, Helminthosporium pedicellatum, Helminthosporium rostratum, Helminthosporium sativum, Helminthosporium sorokinianum, Helminthosporium turcicum, Helminthosporium victoriae, Hormodendrum cladosporioides, Hyalothyridium maydis, Hypocrea sp., Kabatiella zeae, Khuskia oryzae, Leptosphaeria maydis, Leptothyrium zeae, Macrophoma zeae, Macrophomina phaseolina, Mariannaea elegans, Microdochium bolleyi, Monascus purpureus, Monascus ruber, Mucor sp., Mycosphaerella tassiana, Mycosphaerella zeae-maydis, Myrothecium gramineum, Nectria haematococca, Nigrospora oryzae, Ophiosphaerella herpotricha, Paraphaeosphaeria michotii, Penicillium chrysogenum, Penicillium expansum, Penicillium oxalicum, Penicillium spp., Periconia circinata, Peronosclerospora maydis, Peronosclerospora philippinensis, Peronosclerospora sacchari, Peronosclerospora sorghi, Peronosclerospora spontanea, Phaeocytosporella zeae, Phaeocytostroma ambiguum, Phaeosphaeria maydis, Phoma sp., Phoma terrestris, Phomopsis sp., Phyllachora maydis, Phyllosticta maydis, Physalospora zeae, Physalospora zeicola, Physopella pallescens, Physopella zeae, Phytophthora cactorum, Phytophthora drechsleri, Phytophthora nicotianae var. parasitica, Pithomyces maydicus, Puccinia polysora, Puccinia sorghi, Pyrenochaeta terrestris, Pythium aphanidermatum, Pythium arrhenomanes, Pythium butleri, Pythium graminicola, Pythium spp., Rhizoctonia solani, Rhizoctonia zeae, Rhizoctonia zeae, Rhizopus arrhizus, Rhizopus microsporus, Rhizopus nigricans, Rhizopus stolonifer, Rhopographus zeae, Sclerophthora macrospore, Sclerophthora rayssiae var. zeae, Sclerospora graminicola, Sclerospora macrospore, Sclerospora maydis, Sclerospora philippinensis, Sclerospora sacchari, Sclerospora sorghi, Sclerospora spontanea, Sclerotium rolfsii, Scolecosporiella sp., Scopulariopsis brumptii, Selenophoma sp., Septoria zeae, Septoria zeicola, Septoria zeina, Setosphaeria pedicellata, Setosphaeria prolata, Setosphaeria rostrata, Setosphaeria turcica, Sphacelia sp., Sphacelotheca reiliana, Sphaerulina maydis, Spicaria sp., Sporisorium holci-sorghi, Stenocarpella macrospore, Stenocarpella maydis, Trichoderma lignorum, Trichoderma viride, Ustilaginoidea virens, Ustilago maydis, Ustilago zeae, Waitea circinata.