Sphaerotheca fuliginea

Fungal Disease

Sphaerotheca fuliginea

Fungal Disease

Sphaerotheca fuliginea

Fungal Disease

Introduction

Sphaerotheca fuliginea is a fungal pathogen that causes powdery mildew, a common disease affecting cucurbits and other crops. It thrives in moderate temperatures and humidity, spreading rapidly under favorable conditions.

Key Environmental Conditions for Disease Development

• Optimal Temperature: 15°C - 27°C
• Favorable Humidity: 50% - 70% relative humidity
• Effect of High Temperature & Low Humidity: Inhibits spore germination and disease progression
• Impact of Humidity: Infection can still occur at lower humidity levels, but high humidity accelerates the disease.

Disease Development & Spread

• Obligate Parasite: Requires living plant tissue to grow.
• Growth Habit: Forms thin layers of mycelium on the leaf surface.
• Spore Production: Spores develop in chains and spread by wind.
• Survival Conditions: Prefers moderate temperatures and shady environments.
• Sensitivity to Sunlight: Spores are vulnerable to extreme heat and direct sun exposure.

Conclusion

Powdery mildew caused by Sphaerotheca fuliginea spreads quickly under mild temperatures, moderate humidity, and shaded conditions. Farmers can mitigate its impact by ensuring proper plant spacing, increasing air circulation, and using resistant varieties to prevent severe infections.