Oídio
Powdery Mildew
Erysiphe Betae
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Erysiphe betae is an ascomycete fungus that causes powdery mildew in various plants, especially beets. Its structure is a network of white mycelium that grows on the surface of the leaves, stems and other parts of the plant. This pathogen reproduces through asexual spores called conidia, which are dispersed by the wind. Conidia germinate under favorable conditions of humidity and temperature, forming germ tubes that penetrate plant tissues. Additionally, Erysiphe betae forms resistance structures called cleistothecia, which contain sexual ascospores. These cleistothecia allow the fungus to survive in plant remains and in the soil during adverse periods. When conditions are favorable again, the ascospores are released and can initiate new infections.
SYMPTOMS
Powdery mildew in table beets is a disease that mainly affects the leaves, reducing photosynthesis and weakening the plant. Symptoms include white powdery Taches covering the surface of leaves and other aerial organs. Infected leaves may turn yellow and drop prematurely, which decreases the plant's ability to produce and store sugars, affecting crop yield and quality.
- White powdery Taches on leaves and stems.
- Yellowing and premature leaf fall.
- Reduction of photosynthesis.
- General weakening of the plant.
- Decrease in crop yield and quality.
TEMPERATURE AND HUMIDITY
15°C - 25°C
60% - 80%
HOW IS IT SPREAD?
Spores carried by the wind, remains of infected crops, direct contact between plants
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 6% [SL] P/V
• SULFUR 70% [SC] P/V
• SULFUR 72% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 82.5% [SC] P/V
• COS-OGA 1.25% [SL] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
Authorized treatments in organic farming
• ORANGE OIL 6% [SL] P/V
• SULFUR 70% [SC] P/V
• SULFUR 72% [SC] 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
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS PEST
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Effective against all types of fungi
- Use varieties resistant to powdery mildew to reduce the susceptibility of the crop.
- Implement crop rotation to avoid the accumulation of the fungus in the soil.
- Remove and destroy remains of infected crops to reduce sources of inoculum.
- Maintain an adequate distance between plants to improve air circulation and reduce humidity in the foliage.
- Apply specific fungicides preventively and at the beginning of the first symptoms.
- Avoid sprinkler irrigation that increases humidity in the foliage.
- Regularly monitor the crop for early detection of the disease.
- Practice proper fertilization management to keep plants vigorous.
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