FUNGICIDE RESISTANCE
Fungicide resistance: the following tables summarise current and historic resistance problems in the UK and potential problems noted from cases of resistance reported from abroad for crops grown in the UK.


Fungicide resistance problems encountered in the UK. The loss of control may be partial or complete.

Home

Crop Pathogen Disease Fungicide
Amenity areas
Turf Microdochium nivale Fusarium patch Benzimidazole
Arable crops
Barley Blumeria (= Erysiphe) graminis Powdery mildew DMI , Morpholine , QoI
Oculimacula (=Tapesia) acuformis Eyespot Benzimidazole
Oculimacula (=Tapesia) yallundae Eyespot Benzimidazole
Pyenophora teres Net blotch QoI
Rhynchosporium secalis Rhynchosporium leaf blotch Benzimidazole , DMI
Ustilago nuda Loose smut Carboximide
Field beans Botrytis cinerea Grey mould Benzimidazole , Dicarboximide
Botrytis fabae Chocolate spot Benzimidazole , Dicarboximide
Peronospora viciae Downy mildew Phenylamide
Linseed Alternaria linicola Seedling blight Dicarboximide
Oilseed rape Pyrenopeziza brassicae Light leaf spot Benzimidazole
Potato Fusarium culmorum Dry rot Benzimidazole
Fusarium sulphureum Dry rot Benzimidazole
Helminthosporium solani Silver scurf Benzimidazole
Phytophthora infestans Late blight Phenylamide
Polyscytalum pustulans Skin spot Benzimidazole
Wheat Blumeria (= Erysiphe) graminis Powdery mildew DMI , Morpholine , QoI , Quinoline
Michrodochium nivale Brown foot rot Benzimidazole
Mycosphaerella graminicola (= Septoria tritici) Leaf spot Benzimidazole , DMI , QoI
Oculimacula (=Tapesia) acuformis Eyespot Benzimidazole
Oculimacula (=Tapesia) yallundae Eyespot Benzimidazole
Fruit crops
Apple Botrytis cinerea Fruit rot Benzimidazole , Dicarboximide
Gloeosporium spp. Fruit rot Benzimidazole
Penicillium expansum Fruit rot Benzimidazole
Phytophthora syringae Fruit rot Metalaxyl
Venturia inaequalis Scab Benzimidazole , DMI , Dodine
Blackberry Septocyta ruborum Purple blotch Copper
Pear Botrytis cinerea Fruit rot Benzimidazole , Dicarboximide
Strawberry Botrytis cinerea Grey mould Benzimidazole , Dicarboximide
Protected crops
Bedding plants Pythium spp. Root rot/damping off Carbamate , Phenylamide
Chrysanthemum Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Puccinia horiana White rust DMI , Morpholine , QoI
Clematis Phoma clematidina Wilt Benzimidazole
Cucumber Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Didymella bryoniae Black stem rot Benzimidazole , Dicarboximide
Penicillium oxalicum Stem rot Benzimidazole
Sphaerotheca fuliginea Powdery mildew Bupirimate , Fenarimol , Imazalil , QoI
Hardy ornamentals Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Lettuce (protected) Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Bremia lactucae Downy mildew Phenylamide
Phoma exigua var.exigua Leaf rot Dicarboximide
Rhizoctonia solani Basal rot Dicarboximide , Tolclofos-methyl
Lily Botrytis elliptica Leaf rot Benzimidazole
Lobelia Alternaria alternata Leaf and stem rot Dicarboximide
Mushrooms Cladobotryum dendroides Cobweb Benzimidazole , Imidazole
Cladobotryum mycophilum type 2 Cobweb Benzimidazole , Imidazole
Verticillium fungicola Dry bubble Benzimidazole , Imidazole
Narcissus Botrytis cinerea Bulb rot Benzimidazole
Fusarium oxysporum f.sp. narcissi Basal rot Benzimidazole
Penicillium spp. Bulb rot Benzimidazole
Pepper Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Pink Fusarium culmorum Stub rot Benzimidazole
Pot plants Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide
Pythium spp. Root rot/damping off Carbamate , Phenylamide
Tomato Botrytis cinerea Grey mould Anilo-pyrimidine , Benzimidazole , Dicarboximide , Dichlofluanid
Didymella lycopersici Stem rot Benzimidazole , Dicarboximide
Erysiphe sp. Powdery mildew Fenarimol
Verticillium tricorpus Wilt Benzimidazole
Vegetable crops
Brassicas Mycospaerella brassicicola Ring spot Benzimidazole
Peronospora parasitica Downy mildew Phenylamide
Celery Septoria apiicola Leaf spot Benzimidazole
Dwarf French beans Botrytis cinerea Grey mould Dicarboximide
Leek Phytophthora porri White tip Phenylamide
Lettuce (field) Bremia lactucae Downy mildew Phenylamide
Pea Botrytis cinerea Grey mould Benzimidazole
Peronospora viciae Downy mildew Phenylamide
Watercress Pythium spp. Root rot Phenylamide


Cases of resistance of historical interest. In the list below the fungicides are no longer commercially approved in the UK for use on the crop concerned.

Crop Pathogen Disease Fungicide
Arable crops
Barley Blumeria (= Erysiphe) graminis Powdery mildew Benzimidazole , Ethirimol
Pyrenophora graminae Leaf stripe Organomercury
Oats Pyrenophora avenae Leaf spot Organomercury
Wheat Blumeria (= Erysiphe) graminis Powdery mildew Benzimidazole
Fruit crops
Blackberry Septocyta ruborum Purple blotch Benzimidazole
Blackcurrant Drapenopeziza ribis Leaf spot Benzimidazole
Sphaerotheca mors-uvae American gooseberry mildew Benzimidazole
Raspberry Botrytis cinerea Grey mould Benzimidazole
Elsinoe veneta Cane spot Benzimidazole
Protected crops
Cucumber Sphaerotheca fuliginea Powdery mildew Benzimidazole , Dimethirimol , Pyrazophos
Lettuce (protected) Rhizoctonia solani Basal rot Quintozene
Vegetable crops
Onion Botrytis cinerea Grey mould Benzimidazole
Botrytis squamosa Leaf rot Benzimidazole
Pea Botrytis cinerea Grey mould Benzimidazole
Shallot Botrytis allii Neck rot Benzimidazole


Examples of reports of resistance overseas on crops grown in the UK. The fungicides mentioned may not be approved on the UK crop at present.

Crop Pathogen Disease Fungicide
Amenity areas
Turf Colletotrichum graminicola Anthracnose Benzimidazole , QoI
Michrodochium nivale Fusarium patch Dicarboximide
Pythium aphanidermatum Pythium blight Phenylamide , QoI
Sclerotinia homoeocarpa Dollar spot Benzimidazole , Dicarboximide , DMI
Arable crops
Potato Alternaria solani Early blight QoI
Sugar beet Cercospora beticola Cercospora leaf spot Benzimidazole
Wheat Blumeria (= Erysiphe) graminis Powdery mildew Quinoline
Oculimacula (=Tapesia) acuformis Eyespot Imidazole
Pyrenophora tritici-repentis Tan spot QoI
Fruit crops
Apple Venturia inaequalis Scab QoI
Grapevine Botrytis cinerea Grey mould Anilo-pirimidine
Plasmopara viticola Downy mildew Acetamide , QoI
Strawberry Phytophthora cactorum Crown rot Phenylamide
Phytophthora fragariae var. fragariae Red core Phenylamide
Hardy nursery stock
Chamaecyparis Phytophthora cinamomi Root and stem rot Fosetyl-aluminium
Other crops
Hops Pseudoperonospora humuli Downy mildew Phenylamide
Protected crops
Chrysanthemum Puccinia horiana White rust Carboxamide
Cucumber Botrytis cinerea Grey mould Phenylsulphamide
Pseudoperonospora cubensis Downy mildew Phenylamide , QoI
Sphaerotheca fuliginea Powdery mildew QoI
 
© Crown Copyright The Food and Environment Research Agency 2009