Disease guides
Know what is wrong with your crop. Each guide shows the symptoms, how to scout, when it is worth acting, and what actually works.
Compiled from published agronomic references including FAO and CABI.
Not sure what to plant? The free crop check ranks every crop here against your own field — soil, climate and terrain. Check your farm →
A spray is often just called mushonga — medicine — but a product you cannot name is one you cannot rotate or observe a withholding period for. The farming glossary explains that word and the rest of the working vocabulary. Open the farming glossary →
Fungal
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Alternaria leaf blight Alternaria spp. -
Angular leaf spot Pseudocercospora griseola -
Anthracnose Colletotrichum spp. -
Armillaria root rot Armillaria spp. -
Ascochyta blight Ascochyta spp. -
Asian soybean rust Phakopsora pachyrhizi -
Bean rust Uromyces appendiculatus -
Black pod Phytophthora palmivora -
Black shank Phytophthora nicotianae -
Black Sigatoka Pseudocercospora fijiensis -
Blue mould Peronospora hyoscyami f.sp. tabacina -
Boll rot Diplodia gossypina -
Botrytis neck rot Botrytis allii -
Brown eye spot Cercospora coffeicola -
Brown spot Cochliobolus miyabeanus -
Bunch rot (grey mould) Botrytis cinerea -
Butt rot Ganoderma spp. -
Carrot leaf blight Cercospora carotae
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Cavity spot Pythium violae -
Cercospora leaf blight Cercospora kikuchii -
Cercospora leaf spot Cercospora beticola -
Charcoal rot Macrophomina phaseolina -
Citrus black spot Phyllosticta citricarpa -
Clubroot Plasmodiophora brassicae -
Coffee berry disease Colletotrichum kahawae -
Coffee leaf rust Hemileia vastatrix -
Coffee wilt disease Fusarium xylarioides -
Collar rot Sclerotium rolfsii -
Damping-off Pythium spp. -
Diplodia root and stalk rot Stenocarpella maydis -
Downy mildew Peronosporaceae -
Early blight Alternaria solani -
Ergot Claviceps africana -
Foot rot -
Frogeye leaf spot Cercospora sojina -
Fruitlet core rot Fusarium ananatum -
Fusarium basal rot Fusarium oxysporum f. sp. cepae -
Fusarium head blight Fusarium graminearum -
Fusarium wilt Fusarium oxysporum -
Ganoderma basal stem rot Ganoderma boninense -
Grey leaf spot Cercospora zeae-maydis -
Groundnut leaf spot Passalora personata -
Groundnut rust Puccinia arachidis -
Guava rust Austropuccinia psidii -
Guava wilt -
Late blight Phytophthora infestans -
Leaf blotch -
Leaf rust Puccinia triticina -
Leaf spot -
Loose smut Ustilago tritici -
Maize ear rot Fusarium verticillioides -
Moringa root and collar rot Lasiodiplodia theobromae (Diplodia root/collar rot) -
Oil palm bunch rot Marasmius palmivorus -
Passion fruit brown spot Alternaria passiflorae -
Passion fruit collar rot Phytophthora nicotianae (with Fusarium solani) -
Pearl millet blast Magnaporthe grisea (Pyricularia grisea), pearl-millet pathotype -
Phytophthora blight Phytophthora capsici -
Phytophthora root rot Phytophthora cinnamomi -
Pineapple base rot Thielaviopsis paradoxa (Chalara paradoxa) -
Powdery mildew -
Purple blotch Alternaria porri -
Rhizome rot Pythium aphanidermatum -
Rice blast Magnaporthe oryzae -
Root rot Fusarium solani -
Rust -
Sclerotinia head rot Sclerotinia sclerotiorum -
Smut -
Sorghum grain mould -
Sorghum head smudge Curvularia lunata -
Stem rust Puccinia graminis -
Stem-end rot -
Sugarcane smut Sporisorium scitamineum -
Sunflower rust Puccinia helianthi -
Taro leaf blight Phytophthora colocasiae
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Teff rust Uromyces eragrostidis -
Tobacco brown spot Alternaria alternata -
Tuber rots -
Turcicum leaf blight Exserohilum turcicum -
Turmeric leaf blotch Taphrina maculans
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Turmeric leaf spot Colletotrichum capsici -
White rot Stromatinia cepivora -
Yam anthracnose Colletotrichum gloeosporioides -
Yellow rust Puccinia striiformis
Bacterial
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Bacterial black spot Xanthomonas citri pv. mangiferaeindicae -
Bacterial blight Xanthomonas spp. -
Bacterial soft rot Pectobacterium carotovorum -
Bacterial spot Xanthomonas spp. -
Bacterial wilt Ralstonia solanacearum -
Banana Xanthomonas wilt Xanthomonas vasicola pv. musacearum -
Black rot Xanthomonas campestris pv. campestris -
Cassava bacterial blight Xanthomonas axonopodis pv. manihotis -
Citrus greening (Huanglongbing) -
Corm rot Erwinia carotovora -
Lethal yellowing -
Little leaf -
Phyllody -
Ratoon stunting disease Leifsonia xyli subsp. xyli -
Tobacco angular leaf spot Pseudomonas syringae pv. tabaci