Downy Mildew of Onion

Symptoms

Pale, yellow-green oval lesions with grayish-purple fungal down on the surface during humid weather, followed by leaf collapse.

Favorable conditions

• •High humidity and extended leaf wetness
• •Cool, overcast weather

Management

1. 1Apply fungicide sprays timed with regional disease forecasting
2. 2Rotate crops
3. 3Avoid overhead irrigation
4. 4Space plants for better airflow