Oídio
Powdery Mildew
Laveillula Taurica
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Laveillula taurica is a fungus belonging to the group of ascomycetes and is known to cause powdery mildew in various plants, including tomatoes. This pathogen is endoparasitic, which means that it lives and develops within the plant tissue of the host. Laveillula taurica produces conidia, which are asexual spores, on the surface of infected leaves. These spores are dispersed primarily by wind and, upon contact with a susceptible plant, germinate and penetrate leaf tissue. The fungus develops mycelia inside the plant, extracting nutrients and causing the appearance of reproductive structures on the leaf surface. Under favorable conditions, the cycle of infection and sporulation can be repeated rapidly, facilitating the spread of the pathogen in the crop.
SYMPTOMS
Powdery mildew caused by Laveillula taurica in tomato initially manifests itself with chlorotic Taches on the leaves, which progress to the appearance of a characteristic whitish powder on the lower surface of the leaves. This mycelium and sporulation of the fungus interfere with photosynthesis and normal growth of the plant, weakening it significantly.
- Chlorotic Taches on the leaves
- Appearance of a white powder on the lower surface of the leaves
- Curling and yellowing of leaves
- Premature defoliation
- Reduction in plant growth
- General loss of vigor
- Decrease in production and quality of fruits
TEMPERATURE AND HUMIDITY
20-30°C
60-80%
HOW IS IT SPREAD?
Wind, contaminated tools, direct contact with infected plants, infected crop remains, contaminated irrigation water
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• SULFUR 80% [DP] P/P
• SULFUR 80% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 80% [WP] P/P
• SULFUR 82.5% [SC] P/V
• SULFUR 98.5% [DP] P/P
• SULFUR 99% [DP] P/P
• BUPIRIMATE 25% [EC] P/V
• CIFLUFENAMID 10% [SC] P/V
• COS-OGA 1.25% [SL] P/V
• DIFENOCONAZOLE 12.5% + CYFLUFENAMIDE 1.5% [DC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• FLUOPYRAM 40% [SC] P/V
• FLUXAPYROXAD 7.5% + DIFENOCONAZOLE 5% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• KRESOXIM-METHYL 50% [WG] P/P
• LAMINARIN 4.5% [SL] P/S
• Penconazole 10% [EC] P/V
• PENCONAZOLE 20% [EW] P/V
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
• TEBUCONAZOLE 25% [WG] P/P
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V
• TRIFLOXISTROBIN 50% [WG] P/P
Treatments allowed in organic farming
• SULFUR 80% [DP] P/P
• SULFUR 80% [SC] P/V
• SULFUR 80% [WG] P/P
• SULFUR 80% [WP] P/P
• SULFUR 82.5% [SC] P/V
• SULFUR 98.5% [DP] P/P
• SULFUR 99% [DP] P/P
• COS-OGA 1.25% [SL] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
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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- Select tomato varieties resistant or tolerant to powdery mildew.
- Maintain good ventilation and adequate spacing between plants to reduce relative humidity.
- Apply treatments with broad-spectrum preventive fungicides specific for powdery mildew.
- Carry out regular pruning to eliminate infected leaves and improve air circulation.
- Implement crop rotations to avoid the accumulation of the pathogen in the soil.
- Use micronized sulfur as a preventive treatment in the early phases of the crop.
- Regularly monitor the crop to detect the first symptoms of the disease.
- Avoid sprinkler irrigation that can increase humidity in the foliage.
Recommendations
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