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Powdery Mildew

Podosphaera Leucotricha

Pathogen:

Fungus

Type:

Risk:

INTERMEDIATE

DESCRIPTION

Pathogen description

Podosphaera leucotricha is a phytopathogenic fungus that causes the disease known as powdery mildew in apple trees and other fruit trees. The fungus develops on the surface of leaves, shoots and fruits, forming a visible mycelium and a white or grayish layer of sporulation. Podosphaera leucotricha can overwinter as mycelium in infected buds and produce spores when conditions are favorable.

Disease description

Powdery mildew in apple trees manifests itself with the appearance of a white or grayish growth on the surface of the leaves, shoots and fruits. The disease can cause leaf deformation and wrinkling, as well as a reduction in the quality and quantity of the crop.

• White or grayish growth on leaves, shoots and fruits.
• Deformation and wrinkling of the leaves.
• Reduction in the quality and quantity of the harvest.
• Fruits with superficial lesions and reduction in commercial quality.

TEMPERATURE AND HUMIDITY

15°C - 25°C

60% - 80%

VOIES DE TRANSMISSION

Air, contact with infected plants, contaminated tools.

Chemical treatments

CONTROL

• ORANGE OIL 60g/L [ME] P/S
• SULFUR 70% [SC] P/V
• SULFUR 72% [SC] P/V
• SULFUR 80% [SC] P/V
• SULFUR 82.5% [SC] P/V
• BOSCALIDE 25.2% + PYRACLOSTROBIN 12.8% [WG] P/P
• BUPIRIMATE 25% [EC] P/V
• CIFLUFENAMID 5.13% [EW] P/V
• DIFENOCONAZOLE 1.67% [EC] P/V
• FLUOPYRAM 20% + TEBUCONAZOLE 20% [SC] P/V
• FLUXAPYROXAD 30% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• KRESOXIM-METHYL 50% [WG] P/P
• SOY LECITHIN
• MEFENTRIFLUCONAZOLE 7.5% [SC] P/V
• Penconazole 10% [EC] P/V
• PENCONAZOLE 20% [EW] P/V
• CALCIUM POLYSULPHIDE 38% [DC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [WG] P/P
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V

Treatments authorized in organic farming

• ORANGE OIL 60g/L [ME] P/S
• SULFUR 70% [SC] P/V
• SULFUR 72% [SC] P/V
• SULFUR 80% [SC] P/V
• SULFUR 82.5% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• SOY LECITHIN
• CALCIUM POLYSULPHIDE 38% [DC] P/V

Biological control

Preventive treatments

• SULFUR 70% [SC] P/V
• SULFUR 72% [SC] P/V
• SULFUR 80% [SC] P/V
• SULFUR 82.5% [SC] P/V
• BOSCALIDE 25.2% + PYRACLOSTROBIN 12.8% [WG] P/P
• BUPIRIMATE 25% [EC] P/V
• CIFLUFENAMID 5.13% [EW] P/V
• DIFENOCONAZOLE 1.67% [EC] P/V
• FLUOPYRAM 20% + TEBUCONAZOLE 20% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• KRESOXIM-METHYL 50% [WG] P/P
• Penconazole 10% [EC] P/V
• PENCONAZOLE 20% [EW] P/V
• CALCIUM POLYSULPHIDE 38% [DC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EC] P/V
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V

• Use apple varieties resistant or tolerant to Podosphaera leucotricha.
• Practice proper pruning to improve air circulation and reduce humidity.
• Disinfect pruning tools and equipment to prevent the spread of the fungus.
• Apply specific fungicides following local recommendations.
• Avoid excess nitrogen fertilization, as it can favor the spread of the fungus.
• Carry out regular monitoring to detect and eliminate infected parts.

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.