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Powdery Mildew
Erysiphe Betae
Pathogène :
Fungus
Type:
Risque:
INTERMEDIATE
Oídio
Descrição da doença
Erysiphe betae is a fungus that causes powdery mildew on various plants, including chard. This fungus is an obligate parasite that forms a layer of white superficial mycelium on the leaves, stems and sometimes on the flowers of the host plant. E. betae spores, called conidia, are dispersed primarily by wind. These spores germinate in conditions of high humidity and moderate temperatures, forming appressoria that penetrate the epidermal cells of the plant. During its growth, the fungus produces more spores that are released into the environment, perpetuating the infection cycle. E. betae can also form resistance structures called cleistothecia that allow its survival in infected plant remains during winter or unfavorable periods.
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Descrição do patógeno
In chard, E. betae causes the disease known as powdery mildew, which manifests mainly on the leaves and affects both the growth and quality of the plant. Infection begins with small, powdery white Taches that expand rapidly, covering large areas of leaves and other tissues. The presence of the fungal mycelium reduces the photosynthetic capacity of the leaves, weakening the plant and making it more susceptible to other diseases and environmental stress.
• White powdery Taches on leaves.
• Extensive coverage of mycelium on leaves and stems.
• Reduction in photosynthetic capacity.
• Yellowed and weakened leaves.
• Drying and premature leaf fall.
• Less growth and vigor of the plant.
TEMPERATURA E UMIDADE
15ºC - 25ºC
60% - 80%
CAMINHOS DE TRANSMISSÃO</span
Wind, direct contact between plants, gardening tools, infected plant remains.
CONTROL
Tratamento químico
• ORANGE OIL 6% [SL] P/V
• SULFUR 80% [WG] P/P
• SULFUR 82.5% [SC] P/V
• COS-OGA 1.25% [SL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
Tratamento biológico
• ORANGE OIL 6% [SL] P/V
• SULFUR 80% [WG] P/P
• SULFUR 82.5% [SC] P/V
• COS-OGA 1.25% [SL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
Traitements biologiques
• BACILLUS AMYLOLIQUEFACIENS (subsp. plantarum, strain D747) 25% [WG] P/P
Recomendações
• Select powdery mildew resistant chard varieties whenever possible.
• Implement proper crop rotation to reduce inoculum accumulation in the soil.
• Maintain good spacing between plants to improve air circulation and reduce relative humidity around the leaves.
• Water in the morning to allow the leaves to dry quickly.
• Remove and destroy remains of infected plants to reduce the amount of inoculum.
• Apply specific fungicides preventively, following local recommendations and regulations.
• Promote biodiversity in cultivation through the use of intercropping and plants that attract the natural enemies of the fungus.
• Carry out frequent monitoring and eliminate infected leaves at the first sign of the disease.
TRAITEMENTS
Remèdes maison
There are no home treatments
Alliés naturels
Traitements chimiques
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
RECOMMANDATIONS
- Check the back of the leaves frequently, especially in dry weather.
- Spray water on the leaves to increase humidity and prevent them from settling.
- Keep plants healthy with good watering and adequate light.
- If you see cobwebs or damage, clean the leaves with a damp cloth or pressurized water.
- Use potassium soap or neem oil every few days until they disappear.
Plantes répulsives
Rosemary, Dill, Coriander
PRODUITS RECOMMANDÉS
*Os tratamentos recomendados ainda são recomendações de acordo com os bancos de dados de autoridades e em nenhum momento substituem as diretrizes estabelecidas de acordo com a legislação de cada país
*Les produits présentés sont des recommandations et ne sont pas nos propres produits. En tant qu'associés Amazon, nous gagnons des revenus grâce aux achats de produits recommandés.
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