Oídio
Powdery Mildew
Podosphaera Xanthii
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Powdery mildew, caused by the fungus Podosphaera xanthii, is a common disease that affects cucurbits, including zucchini, squash and cucumbers. This fungus, also known as white mold, is characterized by its powdery, whitish appearance that forms on the leaves, stems and fruits of infected plants. Podosphaera xanthii thrives in conditions of high relative humidity and moderate temperatures, and its spores can spread easily through air, irrigation water, and direct plant-to-plant contact. This pathogen can significantly weaken plants, reducing their ability to photosynthesize and affecting their performance.
SYMPTOMS
The disease caused by powdery mildew in cucurbits manifests itself mainly in the form of a layer of white or grayish powder on the leaves, stems and fruits of the plants. These Taches may start out as small white Taches and gradually expand, covering large areas of the plant. In addition to the characteristic dust, affected leaves may show deformation and curling, while fruits may develop Taches or deformations that reduce their quality and commercial value.
TEMPERATURE AND HUMIDITY
20°C - 30°C
50% - 70%
HOW IS IT SPREAD?
Wind, irrigation water, direct contact between plants, cultivation equipment.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 60g/L [ME] P/S
• AZOXISTROBIN 12% + TEBUCONAZOLE 20% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• SULFUR 80% [DP] 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
• TEA TREE EXTRACT (MELALEUCA ALTERNIFOLIA) 22.25% [EC] P/V
• FLUXAPYROXAD 7.5% + DIFENOCONAZOLE 5% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• MEPTYLDINOCAP 35% [EC] P/V
• METRAPHENONE 50% [SC] P/V
• Penconazole 10% [EC] P/V
• PENCONAZOLE 20% [EW] P/V
• PENTIOPYRAD 20% [SC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V
Treatments allowed in organic farming
• ORANGE OIL 60g/L [ME] P/S
• SULFUR 80% [DP] 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
• TEA TREE EXTRACT (MELALEUCA ALTERNIFOLIA) 22.25% [EC] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
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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To prevent and control powdery mildew in cucurbit crops, it is important to implement integrated pest management practices. This includes selecting resistant varieties, eliminating weeds that can serve as alternative hosts, proper pruning to improve air circulation, and using preventative fungicides.
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