Downy Mildew

Onion

Name: Downy Mildew

Scientific Name: Peronospora destructor

Crop: Onion

Description:

  • Warm and humid climates favour the occurrence of this disease.

Damage Symptoms:

• The leaf surface is covered with a white downy growth.

• The leaves turn yellow, followed by drying, which occurs from the leaf tip to the base.

• Rotting of the bulb occurs.

Preventive Measures:

• Excessive application of nitrogen should be avoided.

Control Measures:

• Three sprayings with Mancozeb 0.2%.