Powdery Mildew
Erysiphe Cichoracerum
Pathogen:
Type:
Fungus
Risk:
HIGH
Lechuga y similares
Oídio
WHO CAUSES IT?
Erysiphe cichoracearum is a biotrophic fungus that belongs to the order Erysiphales, responsible for causing powdery mildew in various plant species. This pathogen is characterized by forming white mycelia and sporangia on the surface of the leaves and other aerial parts of the plant. The cycle begins with the dissemination of conidia through the air, which find a susceptible plant in which to germinate and penetrate the tissues, forming haustoria that extract nutrients from living cells. Throughout its development, it produces new generations of conidia that continue the spread of the fungus. During the coldest months or in the absence of hosts, the fungus survives in specialized structures called cleistothecia, which house ascospores capable of resisting adverse conditions until the arrival of more favorable temperatures.
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SYMPTOMS
In lettuce and similar crops, Erysiphe cichoracearum causes powdery mildew, a disease that affects the growth and productivity of plants by interfering with their photosynthetic capacity and weakening them. The first symptoms appear as powdery white Taches on the leaves, stems or even flowers. As the disease progresses, the affected leaves tend to yellow, dry and fall prematurely, seriously affecting the quality of the crop.
- Appearance of whitish, powdery Taches on the surface of the leaves.
- Yellowing and weakening of the affected leaves.
- Premature fall of severely infected leaves.
- Delay in the general growth and development of the plant.
- Reduction in the quality and quantity of the harvest.
TEMPERATURE AND HUMIDITY
15-25°C
50-80%
TRANSMISSION PATHS
Air, wind, infected plant debris, contaminated tools, contaminated irrigation water
Do you want to remove this disease? Choose how you want to treat it.
TREATMENTS
Chemical treatment
• ORANGE OIL 6% [SL] P/V
• ORANGE OIL 60g/L [ME] P/S
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• SULFUR 80% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 80% [WP] P/P
• SULFUR 82.5% [SC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• FLUXAPYROXAD 7.5% + DIFENOCONAZOLE 5% [SC] P/V
• LAMINARIN 4.5% [SL] P/S
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
Authorized treatments in organic farming
• ORANGE OIL 6% [SL] P/V
• ORANGE OIL 60g/L [ME] P/S
• SULFUR 80% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 80% [WP] P/P
• SULFUR 82.5% [SC] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• LAMINARIN 4.5% [SL] P/S
Biological control
• BACILLUS AMYLOLIQUEFACIENS (strain FZB24) 13% [WP] P/P
• BACILLUS AMYLOLIQUEFACIENS (subsp. plantarum, strain D747) 25% [WG] P/P
• BACILLUS SUBTILIS (strain IAB/BS03) (1 x 10E8 cfu/g) 1% [WP] P/P
Recommendations
- Use powdery mildew resistant cultivars when possible, as a key preventive measure.
- Ensure adequate ventilation between plants to reduce the accumulation of humidity, a favorable condition for the development of the fungus.
- Avoid sprinkler irrigation in the cooler hours, since prolonged humidity on the leaves encourages the germination of pathogen spores.
- Carry out constant monitoring in the early stages of the crop to detect the first signs of infection and apply treatments in time.
- Apply fungicides preventively or at the beginning of the appearance of symptoms, using specific products for powdery mildew.
- Rotate fungicides with different modes of action to avoid the appearance of resistance.
- Eliminate and destroy infected plant remains after harvest to reduce the presence of inoculum in the following season.
- Keep nearby weeds under control that may serve as alternative hosts for the fungus.
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TREATMENTS
Homemade treatments
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
RECOMMENDATIONS
REPELLENT PLANTS
RECOMMENDED PRODUCTS TO ELIMINATE THIS PEST
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*The recommended treatments are still recommendations according to the databases of the authorities and at no time do they replace the guidelines established according to the legislation of each country
*The products shown are recommendations and are not our own products. As Amazon Associates, we earn revenue from purchases of recommended products.
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