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Powdery Mildew

Uncinula Necator / Erysiphe Necator

Pathogen:

Fungus

Type:

Risk:

HIGH

DESCRIPTION

Pathogen description

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.

Disease description

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%

VOIES DE TRANSMISSION

Spores carried by the wind, direct contact between infected and healthy leaves, cleistothecia in plant remains, contaminated instruments

Chemical treatments

CONTROL

• 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 authorized 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

Biological control

• AMPELOMICES QUISQUALIS 58% [WG] P/P
• BACILLUS AMYLOLIQUEFACIENS (strain FZB24) 13% [WP] P/P
• Bacillus pumilus strain QST 2808 (1x10E9 CFU/g) 14.35g/L [SC] P/V

Preventive treatments

• AMPELOMICES QUISQUALIS 58% [WG] P/P
• 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
• BACILLUS AMYLOLIQUEFACIENS (strain FZB24) 13% [WP] P/P
• Bacillus pumilus strain QST 2808 (1x10E9 CFU/g) 14.35g/L [SC] P/V
• 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
• DIFENOCONAZOLE 1.67% [EC] P/V
• DIFENOCONAZOLE 25% [EC] 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
• KRESOXIM-METHYL 50% [WG] P/P
• LAMINARIN 4.5% [SL] P/S
• 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

- 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.

Recommendations

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*The recommended treatments are recommendations based on the authorities' databases and do not replace in any way the guidelines established by the legislation of each country.