Controlling Powdery Mildew in Cucurbits : Symptoms and Solutions

  • , by Agriplex India
  • 5 min reading time

Powdery Miledew in Cucurbits plants

Cucurbits, including popular plants like cucumbers, melons, and pumpkins, offer bountiful harvests and vibrant gardens. However, a persistent fungal disease known as powdery mildew can mar the beauty and productivity of these crops. Powdery mildew is a common affliction that gardeners and farmers face, but with the right knowledge and controls, you can overcome this challenge and enjoy thriving cucurbit plants. In this blog post, we will delve into the symptoms of powdery mildew in cucurbits and explore effective strategies to combat it

Understanding Powdery Mildew:

Powdery mildew, scientifically known as Podosphaera xanthii or Golovinomyces cichoracearum, is a fungal disease that affects cucurbit plants worldwide. It thrives in warm and dry climates, making it a frequent concern in many regions. The pathogen typically spreads through airborne spores, which can travel significant distances and quickly establish infections.

Identifying Symptoms of Powdery Mildew:

  1. White Powdery Coating: The most noticeable symptom of powdery mildew is the appearance of a white, powdery coating on the leaves, stems, and even fruits of cucurbits. The coating resembles talcum powder and may start as small spots that gradually merge into larger patches.
  2. Leaf Curling and Distortion: Infected leaves often exhibit curling, wilting, and distortion. They may also develop yellow or brown patches as the disease progresses, leading to stunted growth and reduced photosynthetic capacity.
  3. Premature Leaf Drop: In severe cases, the infected leaves may die and fall prematurely, severely impacting the plant's ability to produce energy through photosynthesis.
  4. Affecting Fruits: Powdery mildew can spread to the fruits of cucurbits, causing them to develop blemishes and deformities. This can result in reduced quality and market value.

Symtoms of Cucurbits Powdery mildew

Effective Controls for Powdery Mildew:

  1. Cultural Practices:

  • Plant Resistant Varieties: Select cultivars that are resistant to powdery mildew. Consult local agricultural extension services or seed catalogs for recommendations.
  • Proper Spacing: Provide adequate spacing between plants to promote airflow and reduce humidity, as dense foliage can create a favorable environment for disease development.
  • Water Management: Water plants at the base, avoiding overhead irrigation. Moisture on the leaves encourages fungal growth. Consider using drip irrigation to keep foliage dry.
  • Pruning and Trellising: Prune and train plants to improve air circulation and reduce plant density. Trellising vines can keep them off the ground, minimizing contact with contaminated soil. 
  1. Organic or Bio Remedies:
  • Neem Oil: Apply Neem oil, a natural insecticide, and fungicide, as a preventive measure or at the early stages of infection. Neem oil disrupts the fungal growth cycle and provides some control against powdery mildew. 
  • Baking Soda Spray: Mix one tablespoon of baking soda and one teaspoon of liquid soap in a gallon of water. Spray the solution on infected plants, ensuring thorough coverage. Repeat every 7-10 days.
  • Milk Spray: Dilute milk with water in a 1:9 ratio and spray it on the affected plants. The proteins and enzymes in milk create an unfavorable environment for the fungus. 

    3.Chemical Fungicides:

  • Fungicides containing active ingredients such as sulfur, potassium bicarbonate, or myclobutanil can provide effective control against powdery mildew. 

Buy Best Chemical Fungicide Online at Agriplex for Control of Powdery Mildew in Cucurbits

Brand Name Technical Dosage
Bayer Nativo Fungicide Tebuconazole + Trifloxystrobin 75 WG(50% +25% w/w) 2-3 ml/Litre of water
Amistar Top Fungicide Azoxystrobin 18.2% + Difenoconazole 11.4% SC 200 ml in 200 litre of Water
Bayer Luna Experience Fluopyram 17.7%+ Tebuconazole17.7% w/w SC (400 SC) 200 ml in 200 litre of Water
Contaf Fungicide Hexaconazole 5 % SC 2 ml/ Lt of water.
Score Fungicide 25%EC Difenconazole 2 ml/ Lt of water.
ROKO Fungicide Thiophanate Methyl 70% WP  Spray @ 100 to 200 gm per ha.
Folicur Fungicide Tebuconazole 250 EC (25.9% w/w) 1-1.5 ml/liter of water
Merivon Fungicide Fluxapyroxad 250 G/L + Pyraclostrobin 250 G/L SC  80-100ml in 200 Lt of water
Custodia Fungicide Azoxystrobin 11% + Tebuconazole 18.3% w/w SC 750ml in 300 Lt of Water
Bayer Buonos Fungicide Tebuconazole 38.39% SC  250ml/acre.
TAQAT Fungicide Captan 70% + Hexaconazole 5% WP 2gm/Lt of water
Bayer Infinito Fungicide FLUOPICOLIDE 5.56% WW + PROPAMOCARB HYDROCHLORIDE 55.6% WW 1.6 Lt/Ha
Indofil Trucop Fungicide Copper oxychloride 50% WP 2.5 Kg/ ha


Note - Follow the instructions on the label carefully and apply as directed.


Powdery mildew can pose a significant challenge for cucurbit growers, but armed with knowledge and effective control measures, you can successfully combat this fungal disease. By promptly identifying the symptoms and implementing appropriate cultural practices, organic remedies, and, when necessary, chemical fungicides, you can protect your cucurbit plants and maximize their productivity. Remember, prevention is key, so take proactive steps to minimize favorable conditions for powdery mildew development. With dedication and a well-rounded approach, you can enjoy healthy, thriving cucurbits throughout the growing season.


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