• Powdery mildew

  first ventilate by only opening the windows on the lee side. Please note, this is not relevant for other diseases that are inhibited by reducing the RH [...] General Powdery mildew is a fungal disease that is caused by many different species of fungi such as Erysiphe, Podosphaera, Oïdium, Leveillula. Damage [...] mostly on the underside of the leaf, because the fungus infects the plant by entering through the stomata and there are more stomata on the underside of

• Phytophthora blight

  protrude through the stomata. Secondary infection is either by germinating sporangia or by zoospores produced in the sporangia. For germination on above-ground [...] fast drying and wound healing, by allowing air circulation Disinfect recirculating nutrient solutions Prevent plant diseases by optimizing plant potential [...] through the skin. The Great Famine was a period of mass starvation caused by this disease which ravaged potato crops throughout Europe during the 1840s

• Early blight

  petals and stems. These spots can be distinguished by the dark and brown concentric rings that are caused by sporulation. Species may differ in specific symptoms [...] spots then turn into dark brown angular lesions with a yellow halo restricted by leaf veins. Lesions can easily rupture. Other symptoms are brown lesions on [...] Infection is both direct and through wounds and stomata. Spores are dispersed by wind and in some species through the splash of rain. How to prevent Early

• Downy mildew of Cucurbits

  also stems and fruits. They cause lesions on the upper leaf surface, bordered by the veins, which are first yellow and then turn brown. On the underside of [...] and the germ tubes infect the plants either through the stomata or directly by penetrating the cuticula. For germination free water is required. For most [...] crop rotation with non-host crops Prevent a humid microclimate. Achieve this by lowering crop density, good aeration during propagation and maintaining a

• Bacterial canker of tomato

  propagation material. It spreads to other seedlings by touching the plants in greenhouse crops and by water in field crops, for example through splashes [...] bacteria. The bacteria can also be dispersed by machinery, crates and tools. The bacteria infect the new plants by entering through wounds and then growing [...] other than that the disease is difficult to distinguish from wilting caused by other pathogens. On potato tubers, first discolouration of the vessel tissue

• Black leg of seedlings

  that are in a sub-optimal condition or suffer from stress, caused for example by too much water, too high or low temperatures or sudden fluctuations in temperature [...] conditions, especially dehydration. Germination of the oospores is stimulated by exudates from roots of a susceptible host nearby. The oospores germinate and [...] or substrate. Oospores are dispersed when soil particles are moved around by humans or machinery. Pythium can survive very well in the soil or substrate

• Damping-off

  that are in a sub-optimal condition or suffer from stress, caused for example by too much water, too high or low temperatures or sudden fluctuations in temperature [...] conditions, especially dehydration. Germination of the oospores is stimulated by exudates from roots of a susceptible host nearby. The oospores germinate and [...] or substrate. Oospores are dispersed when soil particles are moved around by humans or machinery. Pythium can survive very well in the soil or substrate

• Black rot of carrots

  petals and stems. These spots can be distinguished by the dark and brown concentric rings that are caused by sporulation. Species may differ in specific symptoms [...] Infection is both direct and through wounds and stomata. Spores are dispersed by wind and in some species through the splash of rain. How to prevent Black [...] conducive to infection. In greenhouses: avoid high RH. Prevent plant diseases by optimizing plant potential and crop resilience.

• Cottony soft rot

  above-ground plant parts. In greenhouses, usually only mycelium is produced by the germinating sclerotia. The fungus grows quite rapidly inside the plant [...] source of infection for the next crop. The dispersal to neighbouring plants is by mycelial growth. How to prevent Cottony soft rot Practice dry cultivation/be [...] plants in a closed plastic bag Remove crop residues Prevent plant diseases by optimizing plant potential and crop resilience.

• Bacterial wilt, brown rot

  eyes also turn grey-brown. This disease can be distinguished from Clavibacter by the bacterial slime produced from wounds, which is not seen in Clavibacter [...] found soil-inhabitant in tropical and subtropical regions and is transferred by the introduction of propagation materials (seed potatoes, cuttings of ornamentals [...] infected plants to neighbouring plants. The bacteria can also be transported by irrigation water. Disease incidence is highest when soil moisture is high