| Common Name | Scientific Name | | | |
| Algae | Algae species | Description | | |
| Allium Neck Rot | Botrytis allii | Description | Photograph | |
| Allium Smudge | Colletotrichum dematium f.sp. circinans | Description | Photograph | |
| Allium Soft Rots | Pseudomonas galdioli pv allicola, capacia and aeruginosa | Description | Photograph | |
| Annual Ryegrass Toxicity | Anguina agrostis | Description | Photograph | |
| Apple Black Spot | Venturia inaequalis | Description | Photograph | |
| Apple Powdery Mildew | Podosphaera leucotricha | Description | Photograph | |
| Apple/Pear Bitter Rot | Glomerella cingulata | Description | Photograph | |
| Apple/Pear Fly Speck | Leptothyrium pomi | Description | Photograph | |
| Apple/Pear Ripe Fruit Spot | Pezicula alba & malicorticis | Description | Photograph | |
| Apple/Pear/Citrus Sooty Blotch | Gloeodes pomigena | Description | Photograph | |
| Armillaria Root Rot | Armillaria luteo-bubalina | Description | Photograph | |
| Barley Arno Bay Blotch | Pyrenophora hordei | Description | Photograph | |
| Barley Black Point | Alternaria species | Description | Photograph | |
| Barley Covered Smut | Ustilago segetum var. segetum | Description | Photograph | |
| Barley Halo Spot | Pseudoseptoria stomaticola | Description | Photograph | |
| Barley Leaf Rust | Puccinia hordei | Description | Photograph | |
| Barley Net Blotch Net Form | Pyrenophora teres f. teres | Description | Photograph | |
| Barley Net Blotch Spot Form | Pyrenophora teres f. maculata | Description | Photograph | |
| Barley Powdery Mildew | Erysiphe graminis f.sp. hordei | Description | Photograph | |
| Barley Scald | Rhynchosporium secalis | Description | Photograph | |
| Barley Spot Blotch | Bipolaris sorokiniana | Description | Photograph | |
| Barley Stem Rust | Puccinia graminis f.sp. tritici & secalis | Description | Photograph | |
| Barley Stripe | Pyrenophora graminea | Description | Photograph | |
| Barley Stripe Rust | Puccinia species | Description | Photograph | |
| Barley Wirrega Blotch | Drechslera wirreganensis | Description | Photograph | |
| Barley Yellow Dwarf Virus | BYDV virus | Description | Photograph | |
| Bean Angular Leaf Spot | Phaeoisariopsis griseola | Description | Photograph | |
| Bean Anthracnose | Colletotrichum lindemuthianum | Description | Photograph | |
| Bean Bacterial Brown Spot | Pseudomonas syringae pv. syringae | Description | Photograph | |
| Bean Chocolate Spot | Botrytis fabae | Description | Photograph | |
| Bean Common Blight | Xanthomonas campestris pv. phaseoli | Description | Photograph | |
| Bean Halo Blight | Pseudomonas syringae pv. phaseoli | Description | Photograph | |
| Bean Leaf Blight | Ascochyta fabae | Description | Photograph | |
| Bean Rust | Uromyces viciae | Description | Photograph | |
| Bean Yellow Mosaic Virus | BYMV virus | Description | Photograph | |
| Beet Blackleg | Pleospora bjoerlingii | Description | Photograph | |
| Beet Cercospora Leaf Spot | Cercospora beticola | Description | Photograph | |
| Beet Downy Mildew | Peronospora farinosa | Description | Photograph | |
| Beet Rust | Uromyces betae | Description | Photograph | |
| Begonia/Zinnia Powdery Mildew | Erysiphe cichoracearum | | Photograph | |
| Blueberry Crown Gall | Agrobacterium species | Description | Photograph | |
| Blueberry/Ornamental Leaf Spot | Alternaria species | Description | Photograph | |
| Boronia Rust | Puccinia boroniae | Description | Photograph | |
| Brassica Alternaria Leaf Spot | Alternaria brassicicola and brassicae | Description | Photograph | |
| Brassica Anthracnose | Gloeosporium concentricum | Description | Photograph | |
| Brassica Black Rot | Xanthomonas campestris pv. campestris | Description | Photograph | |
| Brassica Cauliflower Mosaic Virus | CMV virus | Description | Photograph | |
| Brassica Clubroot | Plasmodiophora brassicae | Description | Photograph | |
| Brassica Downy Mildew | Peronospora parasitica | Description | Photograph | |
| Brassica Light Leaf Spot | Cylindrosporium concentricum | Description | Photograph | |
| Brassica Peppery Leaf Spot | Pseudomonas syringae pv. maculicola | Description | Photograph | |
| Brassica Powdery Mildew | Erysiphe cruciferarum | Description | Photograph | |
| Brassica Ring Spot | Mycosphaerella brassicicola | Description | Photograph | |
| Brassica Turnip Mosaic Virus | TMV virus | Description | Photograph | |
| Brassica White Blister Rust | Albugo candida | Description | Photograph | |
| Brassica Yellows | Fusarium oxysporum f.sp. conglutinans | Description | Photograph | |
| Brassica/Celery/Potato Bacterial Soft Rot | Erwinia carotovora pv. carotovora | Description | Photograph | |
| Brassica/Onion Bacterial Soft Rot | Erwinia and Pseudomonas species | Description | Photograph | |
| Canola White Leaf Spot | Pseudocercosporella capsellae | Description | Photograph | |
| Canola/Brassica Blackleg | Leptosphaeria maculans | Description | Photograph | |
| Capsicum/Tomato Powdery Mildew | Leveillula taurica | | Photograph | |
| Carnation Alternaria Leaf Spot | Alternaria zinniae | Description | Photograph | |
| Carnation Fusarium Wilt | Fusarium oxysporum f.sp. dianthi | Description | Photograph | |
| Carnation Leaf Spot | Alternaria dianthi | Description | Photograph | |
| Carnation Rust | Uromyces carophyllinus | Description | Photograph | |
| Carnation Stem Canker | Fusarium avenaceum and graminearum | Description | Photograph | |
| Carrot Cercospora Leaf Spot | Cercospora carotae | Description | Photograph | |
| Carrot Leaf Blight | Alternaria dauci and radicina | Description | Photograph | |
| Carrot/Parsnip Septoria Leaf Spot | Septoria species | Description | Photograph | |
| Celery Cercospora Early Blight | Cercospora apii | Description | Photograph | |
| Celery Septoria Leaf Spot | Septoria apiicola | Description | Photograph | |
| Cereal Common Root Rot | Bipolaris sorokiniana | Description | Photograph | |
| Cereal Crown Rot | Fusarium graminearum group 2 | Description | Photograph | |
| Cereal Rhizoctonia Patch | Rhizoctonia solani AG-8 | Description | Photograph | |
| Cereal Rye Stem Rust | Puccinia graminis f.sp. secalis | Description | Photograph | |
| Chickpea Ascochyta | Ascochyta rabiei | Description | Photograph | |
| Chrysanthemum White Rust | Puccinia horiana | Description | Photograph | |
| Chrysanthemum/Carnation Rust | Puccinia chrysanthemi | Description | Photograph | |
| Citrus Black Spot | Guignardia citricarpa | Description | Photograph | |
| Citrus Brown Rot | Phytophthora citricola, citrophthora & hibernalis | Description | Photograph | |
| Citrus Limb Blight | Corticium salmonicolor | Description | Photograph | |
| Citrus Melanose | Diaporthe citri | Description | Photograph | |
| Citrus Septoria Leaf Spot | Septoria citri and citricola | Description | Photograph | |
| Citrus Sour Rot | Geotrichum candidum | Description | Photograph | |
| Citrus(Lemon) Scab | Elsinoe fawcetti | Description | Photograph | |
| Clover Cercospora | Cercospora zebrina | Description | Photograph | |
| Clover Powdery Mildew | Erysiphe polygonii | Description | Photograph | |
| Clover Rust | Uromyces trifolii | Description | Photograph | |
| Clover Scorch | Kabatiella caulivora | Description | Photograph | |
| Clover Wart | Physoderma trifolii | Description | Photograph | |
| Clover/Lucerne Leptosphaerulina Leaf Spot | Leptosphaerulina trifolii and briosiana | Description | Photograph | |
| Clover/Lucerne Pseudopeziza Leaf Spot | Pseudopeziza trifolii | Description | Photograph | |
| Clover/Lucerne/Medic Blackstem and Leaf Spot | Phoma medicaginis | Description | Photograph | |
| Clover/Lucerne/Medic Stemphylium Leaf Spot | Stemphylium botryosum | Description | Photograph | |
| Cucumber Mosaic Virus | CMV virus | Description | Photograph | |
| Cucurbit Angular Leaf Spot | Pseudomonas syringae pv. lachrymans | Description | Photograph | |
| Cucurbit Anthracnose | Colletotrichum orbiculare | Description | Photograph | |
| Cucurbit Bacterial Leaf Spot | Xanthomonas campestris pv. cucurbitae | Description | Photograph | |
| Cucurbit Downy Mildew | Pseudoperonospora cubensis | Description | Photograph | |
| Cucurbit Fusarium Solani Wilt | Fusarium solani f.sp. cucurbitae | Description | Photograph | |
| Cucurbit Fusarium Wilt | Fusarium oxysporum f.sp. cucumerinum, melonis and niveum | Description | Photograph | |
| Cucurbit Gummy Stem Blight | Didymella bryoniae | Description | Photograph | |
| Cucurbit Leaf Spot | Alternaria cucumerina | Description | Photograph | |
| Cucurbit Powdery Mildew | Sphaerotheca fuligena | Description | Photograph | |
| Cucurbit Septoria Spot | Septoria cucurbitacearum | Description | Photograph | |
| Cucurbit Target Leaf Spot | Cercospora citrullina | Description | Photograph | |
| Die-back | Phytophthora cinnamomi | Description | Photograph | |
| Fern Botrytis Leaf Spot | Botrytis species | Description | Photograph | |
| Fescue Leaf Rust | Puccinia species | Description | Photograph | |
| Fescue Stem Rust | Puccinia species | Description | Photograph | |
| Fusarium | Fusarium species | Description | Photograph | |
| Gladioli Botrytis Leaf & Flower Spot | Botrytis gladiolorum | Description | Photograph | |
| Gladiolus Stemphyllium Spot or Leaf Blight | Stemphylium species | Description | Photograph | |
| Grape Downy Mildew | Plasmopara viticola | Description | Photograph | |
| Grape Phomopsis Cane | Phomopsis viticola | Description | Photograph | |
| Grape Powdery Mildew | Uncinula necator | Description | Photograph | |
| Grape/Rose Anthracnose Black Spot | Elsinoe ampelina | Description | Photograph | |
| Lentil Ascochyta Blight | Ascochyta lentis | Description | Photograph | |
| Lettuce Anthracnose | Marssonina panattoniana | Description | Photograph | |
| Lettuce Bacterial Leaf Spot | Xanthomonas campestris pv. vitians | Description | Photograph | |
| Lettuce Big Vein Virus | LBVV virus | Description | Photograph | |
| Lettuce Downy Mildew | Bremia lactucae | Description | Photograph | |
| Lettuce Mosaic Virus | LMV virus | Description | Photograph | |
| Lettuce Necrotic Yellows Virus | LNYV virus | Description | Photograph | |
| Lettuce Septoria Leaf Spot | Septoria lactucae | Description | Photograph | |
| Loquat Black Speck | Spilocea eriobotryae | Description | Photograph | |
| Loquat Leaf Fleck | Enterosporium species | Description | Photograph | |
| Lucerne/Medic Downy Mildew | Peronospora trifoliorum | Description | Photograph | |
| Lucerne/Medic Rust | Uromyces striatus | Description | Photograph | |
| Lucerne/Medic Stagonospora Leaf Spot | Stagonospora meliloti | Description | Photograph | |
| Lupin Brown Leaf Spot | Pleiochaeta setosa | Description | Photograph | |
| Lupin Cladosporium Leaf Spot | Cladosporium tenuissimum | Description | Photograph | |
| Lupin Grey Leaf Spot | Stemphylium vesicarium | Description | Photograph | |
| Lupin Phomopsis | Phomopsis leptostromiformis | Description | Photograph | |
| Lupin Pleiochaeta Root Rot | Pleiochaeta setosa | Description | Photograph | |
| Lupin/Tomato Anthracnose | Colletotrichum gloeosporioides | Description | Photograph | |
| Mint Rust | Puccinia menthae | Description | Photograph | |
| Mould; Blue (P. expansum) | Penicillium expansum | Description | Photograph | |
| Mould; Blue (P. italicum) | Penicillium italicum | Description | Photograph | |
| Mould; Green | Penicillium digitatum | Description | Photograph | |
| Mould; Grey | Botrytis cinerea | Description | Photograph | |
| Mould; Penicillium | Penicillium species | Description | Photograph | |
| Oat Barley Yellow Dwarf Virus | BYDV virus | Description | Photograph | |
| Oat Halo Blight | Pseudomonas syringae pv. coronafaciens | Description | Photograph | |
| Oat Leaf Rust | Puccinia coronata f.sp. avenae | Description | Photograph | |
| Oat Red Leather Leaf | Spermospora avenae | Description | Photograph | |
| Oat Septoria Blotch | Phaeosphaeria avenaria | Description | Photograph | |
| Oat Smut | Ustilago avenae or segetum var. hordei | Description | Photograph | |
| Oat Stem Rust | Puccinia graminis f.sp. avenae | Description | Photograph | |
| Oat Stripe Blight | Pseudomonas syringae pv. striafaciens | Description | Photograph | |
| Onion Downy Mildew | Peronospora destructor | Description | Photograph | |
| Onion White Rot | Sclerotium cepivorum | Description | Photograph | |
| Onion/Garlic Purple Blotch | Alternaria porri | Description | Photograph | |
| Ornamental Rust | Phragmidium and Puccinia species | Description | Photograph | |
| Ornamentals Septoria Leaf Spot | Septoria species | Description | Photograph | |
| Passionfruit Brown Spot | Alternaria passiflorae | Description | Photograph | |
| Passionfruit Grease Spot | Pseudomonas passiflorae | Description | Photograph | |
| Pea Ascochyta Black Spot | Ascochyta pisi | Description | Photograph | |
| Pea Bacterial Blight | Pseudomonas syringae pv. pisi | Description | Photograph | |
| Pea Black Spot | Mycosphaerella pinodes | Description | Photograph | |
| Pea Downy Mildew | Peronospora viciae | Description | Photograph | |
| Pea Powdery Mildew | Erysiphe pisi | Description | Photograph | |
| Pea Wilt | Fusarium oxysporum f.sp. pisi | Description | Photograph | |
| Peach Leaf Curl | Taphrina deformans | Description | Photograph | |
| Pear Black Spot | Venturia pirina | Description | Photograph | |
| Phytophthora | Phytophthora species | Description | Photograph | |
| Phytophthora Fruit Rot | Phytophthora nicotianae var. parasitica | Description | Photograph | |
| Phytophthora Root Rot | Phytophthora megasperma | | | |
| Poppy Leaf Smut | Entyloma fuscum | Description | Photograph | |
| Potato Leaf Roll Virus | PLRV virus | Description | Photograph | |
| Potato Powdery Scab | Spongospora subterranea | Description | Photograph | |
| Potato Virus A | PVA virus | Description | Photograph | |
| Potato Virus Y | PVY virus | Description | Photograph | |
| Potato/Tomato Late Blight | Phytophthora infestans | Description | Photograph | |
| Potato/Tomato/CapsicumTarget Spot | Alternaria solani | Description | Photograph | |
| Pythium Root Rot | Pythium species | Description | Photograph | |
| Ramularia leaf spot | Ramularia collo-cygni | | | |
| Rhizoctonia | Rhizoctonia solani | Description | Photograph | |
| Rose Anthracnose | Sphaceloma rosarum | Description | Photograph | |
| Rose Black Spot | Diplocarpon rosae | Description | Photograph | |
| Rose Coniothyrium Canker | Coniothyrium species | Description | Photograph | |
| Rose Downy Mildew | Peronospora sparsa | Description | Photograph | |
| Rose Powdery Mildew | Sphaerotheca pannosa | Description | Photograph | |
| Rose/Ornamental Powdery Mildew | Oidium and Sphaerotheca species | Description | Photograph | |
| Rot; Gloeosporium Storage | Gloeosporium species | Description | Photograph | |
| Rot; Sclerotinia | Sclerotinia sclerotiorum | Description | Photograph | |
| Rot; Sclerotium Base | Sclerotium rolfsii | Description | Photograph | |
| Rot; Transit | Rhizopus stolonifer | Description | Photograph | |
| Ryegrass Blind Seed Disease | Gloetinia granigena | Description | Photograph | |
| Ryegrass Leaf Rust | Puccinia species | Description | Photograph | |
| Ryegrass Stem Rust | Puccinia species | Description | Photograph | |
| Sclerotinia | Sclerotinia minor | Description | Photograph | |
| Sclerotinia | Sclerotinia species | Description | Photograph | |
| Soybean Black Leaf Blight | Arkoola nigra | Description | Photograph | |
| Stone Fruit Bacterial Gummosis | Pseudomonas syringae pv. syringae | Description | Photograph | |
| Stone Fruit Bacterial Spot | Xanthomonas campestris pv. pruni | Description | Photograph | |
| Stone Fruit Blossom Blight | Monilinia laxa | Description | Photograph | |
| Stone Fruit Brown Rot | Monilinia fructicola | Description | Photograph | |
| Stone Fruit Crown Gall | Agrobacterium tumefaciens | Description | Photograph | |
| Stone Fruit Freckle | Venturia carpophila | Description | Photograph | |
| Stone Fruit Rust | Tranzschelia discolor | Description | Photograph | |
| Stone Fruit Shothole | Stigmina carpophila | Description | Photograph | |
| Strawberry Eyespot | Mycosphaerella fragariae | Description | Photograph | |
| Strawberry Leaf Blight | Dendrophoma obscurans | Description | Photograph | |
| Strawberry Leaf Scorch | Diplocarpon earlianum | Description | Photograph | |
| Strawberry Leak | Rhizopus arrhizus | Description | Photograph | |
| Strawberry Powdery Mildew | Sphaerotheca maculans | Description | Photograph | |
| Strawberry/Capsicum Black Spot | Colletotrichum acutatum | Description | Photograph | |
| Strawberry/Tomato Wilt | Verticillium dahliae | Description | Photograph | |
| Tomato Bacterial Speck | Pseudomonas syringae pv. tomato | Description | Photograph | |
| Tomato Grey Leaf Spot | Stemphylium solani | Description | Photograph | |
| Tomato Leaf Mould | Fulvia fulva | Description | Photograph | |
| Tomato Septoria Leaf Spot | Septoria lycopersici | Description | Photograph | |
| Tomato Spotted Wilt Virus | TSWV virus | Description | Photograph | |
| Tomato Tobacco Mosaic Virus | TMV virus | Description | Photograph | |
| Tomato/Capsicum Bacterial Canker | Corynebacterium michiganense pv. michiganense | Description | Photograph | |
| Tomato/Capsicum Bacterial Spot | Xanthomonas campestris pv. vesicatoria | Description | Photograph | |
| Tomato/Capsicum Fusarium Wilt | Fusarium oxysporum f.sp. lycopersici | Description | Photograph | |
| Tulip Fire | Botrytis tulipae | Description | Photograph | |
| Turf Black Helminthosporium (Leaf Spots) | Drechslera, Bipolaris, Exserohilum,Curvularia species | Description | Photograph | |
| Turf Brown Patch | Rhizoctonia species | Description | | |
| Turf Dollar Spot | Sclerotinia homeocarpa | Description | Photograph | |
| Turf Fusarium Patch | Microdochium nivale | Description | | |
| Turf Grey Leaf Spot | Pyricularia grisea | Description | | |
| Turf Spring Dead Spot | Leptosphaeria namari | Description | Photograph | |
| Turf Take-all | Gaeumannomyces graminis var. avenae | Description | Photograph | |
| Vegetable Rust | Uromyces species | Description | Photograph | |
| Walnut Blight | Xanthomonas campestris pv. juglans | Description | Photograph | |
| Wheat Barley Yellow Dwarf Virus | BYDV virus | Description | Photograph | |
| Wheat Black Point | Alternaria species | Description | Photograph | |
| Wheat Bunt | Tilletia laevis, tritici, foetida & caries | Description | Photograph | |
| Wheat Common Leaf Spot | Drechslera verticillata | Description | Photograph | |
| Wheat Downy Mildew | Sclerophthora macrospora | Description | Photograph | |
| Wheat Ergot | Claviceps purpurea | Description | Photograph | |
| Wheat Eyespot | Tapesia yallundae | Description | Photograph | |
| Wheat Flag Smut | Urocystis agropyri | Description | Photograph | |
| Wheat Head Scab | Fusarium graminearum group 1 | Description | Photograph | |
| Wheat Leaf Rust | Puccinia recondita | Description | Photograph | |
| Wheat Powdery Mildew | Erysiphe (Blumaria) graminis f.sp. tritici | Description | Photograph | |
| Wheat Ring Spot | Drechslera campanulata | Description | Photograph | |
| Wheat Septoria Nodorum Blotch | Phaeosphaeria nodorum | Description | Photograph | |
| Wheat Septoria Tritici Blotch | Mycosphaerella graminicola | Description | Photograph | |
| Wheat Stem Rust | Puccinia graminis f.sp. tritici | Description | Photograph | |
| Wheat Stripe Rust | Puccinia striiformis | Description | Photograph | |
| Wheat Take-all | Gaeumannomyces graminis var. tritici | Description | Photograph | |
| Wheat Yellow Spot | Pyrenophora tritici-repentis | Description | Photograph | |
| Wheat/Barley Loose Smut | Ustilago segetum var. tritici | Description | Photograph | |
| Zuchini Yellow Mosaic Virus | ZYMV virus | Description | Photograph | |