Powdery mildew of Peas

Erysiphe pisi, commonly known as pea powdery mildew, is a fungal pathogen that affects pea plants (Pisum sativum). Powdery mildew caused by Erysiphe pisi can lead to reduced yield and quality of pea crops. Here's an informative description of the pathogen, including its appearance, identification, and management:

Appearance:

Leaf Symptoms:

1. White Powdery Growth: The characteristic symptom is the presence of a white, powdery growth on the upper surfaces of leaves, stems, and other above-ground plant parts.
2. Circular Patches: The powdery growth often forms circular patches, giving affected leaves a dusty or powdery appearance.
3. Leaf Curling and Distortion: Infected leaves may exhibit curling, distortion, and reduced expansion.

Identification:

1. White Powdery Growth: Easily identify pea powdery mildew by the presence of the characteristic white powdery growth on leaves and stems.
2. Circular Patches: Observe for circular patches of powdery mildew on the upper surface of leaves.
3. Leaf Curling and Distortion: Note any leaf curling, distortion, or yellowing associated with the powdery growth.

Management:

Cultural Practices:

1. Pruning: Promote good air circulation through proper pruning to reduce humidity around pea plants.
2. Spacing: Ensure proper plant spacing to minimize overcrowding and facilitate air movement.

Resistant Varieties:

1. Plant Resistant Pea Varieties: Utilize pea varieties that are bred for resistance or tolerance to powdery mildew.

Fungicide Application:

1. Regular Sprays: Apply fungicides preventatively and regularly, especially during periods conducive to powdery mildew development.
2. Systemic Fungicides: Consider using systemic fungicides that provide protection to new plant growth.

Sanitation:

1. Remove Infected Debris: Collect and destroy infected leaves and plant material to reduce the overwintering source of the pathogen.

Regular Monitoring:

1. Scouting for Symptoms: Regularly inspect pea plants for early symptoms of powdery mildew, especially during conditions favorable for disease development.