Fungus causative
Pythium debaryanum
Funge shape:
The mycelium of the fungus is undivided and has many branches. At the end of these branches are spongy sacs that germinate with the formation of ciliary spores.
Penetration is direct penetration in a few cases. Reproduction: sexually by oocysts, and penetration of host cells into cells or between cells occurs.
Penetration: by mechanical pressure or secretion of enzymes
Symptoms:
- When this fungus infects plants or seeds, whether in pots or in permanent soil, it leads to the elimination of seedlings and the elimination of seeds.
- The second case is when the seedlings are infected, but before they appear on the soil surface, this leads to rotting and death before they appear on the soil surface.
- The third case is when the seedling is infected, but after it appears above the soil surface, this leads to the death of the seedling and its rotting and rotting of the stem
- The occurrence of dormancy of the infected plants and the drop of the top of the affected seedlings down leads to the absence of many seedlings above the soil surface, especially in ornamental plants, and thus causes severe losses in ornamental plants.
Ways to combat it
- Cultivation of seeds of ornamental plants in a fungus-free soil by sterilizing them with a 5% formalin solution two weeks before planting, with good ventilation to remove formal fumes.
- Treating seeds with fungal disinfectants
- Moderate irrigation and prevent crowding of plants
- Cultivation of fungus-resistant varieties
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