Ceniza
Ash
Podosphaera Sp, Blumeria Sp, Erysiphe Sp., Golovinomyces Sp. Laveillula Sp.
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
The fungi of the genus Podosphaera, Blumeria, Erysiphe, Golovinomyces and Laveillula are pathogens that cause powdery mildew in plants. These fungi are characterized by the production of asexual spores called conidia, which are easily dispersed by the wind. Once the conidia find a suitable surface on the leaves, shoots or flowers of the host plant, they germinate and form a superficial mycelium that adheres to the cuticle of the plant. The fungus extracts nutrients through haustoria, specialized structures that penetrate epidermal cells without destroying them. During the end of the growing season, some of these fungi produce sexual structures called cleistothecia, which contain ascospores and serve to perpetuate the fungus, allowing it to survive in plant remains until the next season.
SYMPTOMS
The powdery mildew disease caused by these fungi in plants is visible mainly on the surface of the leaves, although it can also affect stems and flowers. This disease is very characteristic and easy to identify by the presence of a white or grayish powder on the surface of the plant. The infection causes general weakening of the plant, reducing its photosynthetic capacity and, in severe cases, can lead to premature defoliation. Affected plants show:
- Appearance of whitish Taches on leaves and shoots.
- Rolled or deformed leaves.
- Slowed and stunted plant growth.
- Reduced or deformed flowering.
- Fruits with superficial Taches or deformations.
- Loss of general vigor in the plant.
- Necrosis in severely affected tissues.
TEMPERATURE AND HUMIDITY
15°C - 25°C
40% - 80%
HOW IS IT SPREAD?
Wind, contaminated tools, direct contact between plants, insect vectors, infected plant remains
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 6% [SL] P/V
• ORANGE OIL 60g/L [ME] P/S
• AZOXISTROBIN 25% [SC] P/V
• SULFUR 80% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 80% [WP] P/P
• CIFLUFENAMID 10% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• METRAPHENONE 50% [SC] P/V
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V
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
• POTASSIUM HYDROGEN CARBONATE 85% [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 DISEASE
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- Carry out regular pruning to improve air circulation in the foliage.
- Maintain an adequate distance between plants to reduce the relative humidity in the growing area.
- Use plant varieties resistant to powdery mildew when possible.
- Apply preventive fungicides in periods of greater susceptibility.
- Remove and destroy remains of infected plants at the end of the growing season.
- Avoid sprinkler irrigation that wets the foliage, opting for drip irrigation.
- Constantly monitor plants for early detection of powdery mildew.
- Implement crop rotation practices to reduce the persistence of the fungus in the soil.
- Use biological products such as neem extracts or baking soda for preventive control.
- Improve soil fertilization to strengthen the natural resistance of plants.
Recommendations
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