idMicrobe: Tool to recognize plant diseases and consult home treatments

The Guide to Caring for Your Plants

Mail

Learn to recognize pests and how to combat them

IdMicrobe

Pest Guide

Symptoms, treatments and recommendations for treating ash

Ash

Podosphaera Sp, Blumeria Sp, Erysiphe Sp., Golovinomyces Sp. Laveillula Sp.

Pathogen:

Fungus

Type:

Risk:

INTERMEDIATE

Ceniza

Plantas decorativas de jardín y/o interior

Ash: Symptoms and damage in decorative garden and/or indoor plants

Damage caused by ash to decorative garden and/or indoor plants

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.

Ash on decorative garden and/or indoor plants: How to recognize and treat it effectively

Podosphaera Sp, Blumeria Sp, Erysiphe Sp., Golovinomyces Sp. Laveillula Sp.

TEMPERATURE AND HUMIDITY

15°C - 25°C

40% - 80%

TRANSMISSION ROUTES

Wind, contaminated tools, direct contact between plants, insect vectors, infected plant remains

Do you want to remove this pest? Choose how you want to treat it.

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

Biological control

• Bacillus pumilus strain QST 2808 (1x10E9 CFU/g) 14.35g/L [SC] P/V
• PYTHIUM OLIGANDRUM (strain M1) 17.5% [WP] P/P

Recommendations

- 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.