• Angular leaf spot

  fragariae is a leaf spot disease found in strawberry. Damage symptoms Xanthomonas fragariae initially causes small, water-soaked lesions on the underside [...] underside of the leaf. They enlarge to angular spots, often limited by the small veins. The distinctive feature is the way the lesions look when using different [...] reflected light is used, the lesions look dark green, but when transmitted light is used, they are translucent. When conditions are humid, a viscous bacterial

• Gummy stem blight

  bryoniae) is a fungal plant pathogen that causes gummy stem blight. Damage symptoms Mycosphaerella cucumis in cucumber causes brown lesions on the foot [...] foot and higher up on the stem. On the lesions, golden-brown gummy drops occur, hence the name gummy stem blight. On the lesions, black specks, the new fruiting [...] visible. On the leaves, round and extending lesions may occur. In cucumber, the most important symptom is internal fruit rot, which can only be recognized

• Black root rot of cucurbits

  General Phomopsis sclerotioides is a plant pathogen infecting cucurbits, causing black root rot of cucurbits. Damage symptoms Phomopsis sclerotioides causes [...] spots with a dark demarcation line on cucumber roots. The lesions are slightly sunken and are mostly formed around the point of attachment of lateral roots [...] yellow-brown to black and ultimately die. Black lesions with fruiting bodies occur more commonly at temperatures of approximately 20 °C whereas at 10 °C the lesions

• Root and crown rot of strawberry

  New diseases in strawberry have been ascribed to Pestalotiopsis clavispora in the case of root and crown rot (of strawberry), first found in The Netherlands [...] longisetula in the case of leaf spots, such as leaf spot of strawberry and fruit rot reported mainly from Brazil. The genus is quite complex, so the taxonomy [...] clavispora is also called Neopestalotiopsis clavispora. Pestalotiopsis clavispora has been connected to strawberry diseases, but has also been linked to rose

• Pea blight, leaf and pod spot

  General Ascochyta pisi is a fungal plant pathogen that causes A scochyta blight on pea (leaf blight or pea blight) and lesions of stems, leaves, and pods [...] symptoms Ascochyta pisi causes spots on leaves, stems and pods of peas. The spots on leaves and pods are round, on the stems they are more elongated. The [...] brown, sunken and surrounded by a dark brown to red-brown border. The first infection is often on the primary leaves. The fungus is seed borne and thus also

• Bacterial wilt, brown rot

  solanacearum is a plant pathogenic bacterium. It is a soil-borne disease and colonises the xylem, causing bacterial wilt and brown rot in a very wide range [...] range of potential host plants. Damage symptoms In potato, field symptoms of Ralstonia solanacearum are wilting and yellowing of leaves and stunted plants [...] plants. Inside, vascular browning is common with bacterial slime oozing from the cut. When the bacteria transfers to young plants through infected tubers

• Early blight

  stage in all Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause primary infection of the [...] Survival can be several years, up to eight years for several Alternaria spp. Typically, Alternaria causes early blight of potato and early blight of tomato, [...] presents itself as spots on leaves, petals and stems. These spots can be distinguished by the dark and brown concentric rings that are caused by sporulation

• Loose smut of wheat

  General Ustilago nuda f.sp. tritici is a basidiomyceteous fungus that affects wheat. It is also known as loose wheat smut, or loose smut of wheat. Damage symptoms [...] symptoms Infection by Ustilago nuda f.sp. tritici remains invisible until head emergence. The first sign of infection is the appearance of a smutted ear. Instead [...] Instead of normal tissue, the ear contains a mass of olive-brown smut spores. Life cycle and appearance of Loose smut of wheat The seeds are infected during

• Downy mildew of Cucurbits

  General Pseudoperonospora cubensis is a plant pathogen causing downy mildew on cucurbit crops like cucumber, cantaloupe, pumpkin, watermelon and squash [...] They cause lesions on the upper leaf surface, bordered by the veins, which are first yellow and then turn brown. On the underside of the leave fluffy growth [...] growth appears which is first white and later turns grey-brown. This is actually the sporulation of the pathogens extruding from the stomata. Life cycle

• Cottony soft rot

  also known as cottony soft root, is a plant pathogenic fungus. It has a very wide range of host plants. Damage symptoms The first symptoms of a cottony soft [...] soft root ( Sclerotinia sclerotiorum ) infection are water-soaked lesions at the stem base. The plant above it wilts and rots. White, fluffy fungal mycelium [...] mycelium grows on the lesions, giving this disease its name cottony soft rot. In the mycelium, big, dark sclerotia are formed. They can easily be seen with