Oídio
Powdery Mildew
Uncinula Necator / Erysiphe Necator
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Uncinula necator, also known as Erysiphe necator, is a pathogenic fungus that mainly affects grapevines. This fungus survives during the winter in the form of cleistothecia, resistant structures found in plant residues and in the cracks of the vine bark. With the onset of spring, these structures release spores that are carried by the wind to the young parts of the plant. Once the spores land on the leaves, shoots or clusters, they germinate if conditions are favorable and form a structure called mycelium that grows on the surface of the plant tissue, feeding on the plant cells. This mycelium, with a powdery and whitish appearance, produces new spores that are released to continue infecting more parts of the vine. Disease development is accelerated by warm, humid climates, allowing several cycles of infection during the growing season.
SYMPTOMS
Powdery mildew caused by Uncinula necator is a disease that seriously affects vine production. It manifests itself mainly in the leaves, stems and bunches of grapes, and can significantly reduce the quality and quantity of the harvest if not properly controlled. The first signs of infection usually appear as chlorotic Taches on the leaves that later develop a white powdery coating. As the disease progresses, affected parts may become deformed, wither, or dry.
- Appearance of a white, powdery layer on the leaves, stems and bunches.
- Chlorotic Taches on the leaves that progress to necrosis.
- Deformation of leaves and young shoots.
- Delay in the growth of shoots and clusters.
- Cracking and malformation of the grapes, which affects their quality.
- Premature fall of affected leaves in severe infections.
TEMPERATURE AND HUMIDITY
20°C - 25°C
70% - 80%
HOW IS IT SPREAD?
Spores carried by the wind, direct contact between infected and healthy leaves, cleistothecia in plant remains, contaminated instruments
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ABE-IT 56 (lysate components of Saccharomyces cerevisiae strain DDSF623) 32.56% [SC] P/V
• ORANGE OIL 6% [SL] P/V
• ORANGE OIL 60g/L [ME] P/S
• AZOXISTROBIN 12% + TEBUCONAZOLE 20% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• AZOXISTROBIN 9.35% + FOLPET 50% [SC] P/V
• SULFUR 70% [SC] P/V
• SULFUR 72% [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 90% [DP] P/P
• SULFUR 98.5% [DP] P/P
• SULFUR 99% [DP] P/P
• BOSCALIDA 20% + KRESOXIM-METHYL 10% [SC] P/V
• BOSCALIDA 50% [WG] P/P
• BUPIRIMATE 25% [EC] P/V
• CIFLUFENAMID 3% + DIFENOCONAZOLE 6% [DC] P/V
• CIFLUFENAMID 5.13% [EW] P/V
• COS-OGA 1.25% [SL] P/V
• DIFENOCONAZOLE 1.67% [EC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• FLUOPYRAM 50% [SC] P/V
• FLUXAPYROXAD 30% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• KRESOXIM-METHYL 50% [WG] P/P
• LAMINARIN 4.5% [SL] P/S
• MEFENTRIFLUCONAZOLE 7.5% [SC] P/V
• MEPTYLDINOCAP 35% [EC] P/V
• METRAPHENONE 50% [SC] P/V
• Penconazole 10% [EC] P/V
• PENCONAZOLE 20% [EW] P/V
• PYROPHENONE 30% [SC] P/V
• CALCIUM POLYSULPHIDE 38% [DC] P/V
• PROQUINAZID 16% + TETRACONAZOLE 8% [EC] P/V
• PROQUINAZID 20% [EC] P/V
• SPYROXAMINE 50% [EC] P/V
• TRIBASIC COPPER SULFATE 8% (expressed in copper) + SULFUR 64% [SC] P/V
• TEBUCONAZOLE 20% [EC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EC] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TEBUCONAZOLE 25% [WG] P/P
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V
• TRIFLOXISTROBIN 50% [WG] P/P
Treatments allowed in organic farming
• ORANGE OIL 6% [SL] P/V
• ORANGE OIL 60g/L [ME] P/S
• SULFUR 70% [SC] P/V
• SULFUR 72% [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 90% [DP] P/P
• 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
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
• TRIBASIC COPPER SULFATE 8% (expressed in copper) + SULFUR 64% [SC] P/V
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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- Use vine varieties resistant to powdery mildew to reduce the impact of the pathogen.
- Carry out adequate pruning to improve ventilation between plants and reduce humidity inside the vineyard.
- Avoid excess nitrogen fertilization, as this can promote vigorous growth that is more susceptible to powdery mildew.
- Implement regular phytosanitary control with preventive applications of specific fungicides for powdery mildew, especially in the early stages of the vegetative cycle.
- Eliminate plant debris and fallen leaves at the end of the season to reduce the inoculum in the vineyard.
- Regularly monitor the vineyard to detect the first symptoms and apply curative treatments to the affected areas as soon as possible.
- Maintain a detailed record of environmental conditions and the dates of appearance of the first symptoms to optimize fungicide applications in subsequent seasons.
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