Measures to Control Scab disease in apple crop

Scab disease is a general term used for a group of plant diseases caused by various fungi or bacteria. These diseases cause rough, scabby lesions to form on the leaves, fruits, tubers, or stems of plants. Apple scab is Caused by the fungus Venturia inaequalis, this disease affects apples, pears, and crabapples. Symptoms include yellow or olive-green spots on leaves, fruit, and sometimes stems. The spots may have a velvety fungal growth on the undersides of leaves. Affected leaves may twist or pucker, turn yellow, and drop prematurely. Fruit may be misshapen and have scabby lesions.

Scientific name: Venturia inaequalis
Type: Disease
Target: Leaves and Fruits
Damage: scabby lesions
Environmental favorable factors for pests/Diseases:

• Temperature: The fungus thrives in cool, wet weather. The optimal temperature range for spore germination and infection is between 4°C and 21°C.
• Humidity: High humidity is crucial for spore germination and infection.

• Leaves: Small, olive-green or brown spots on the upper surface of leaves, often appearing first near the veins. Velvety, olive-gray to black spots on the underside of leaves.
• Fruit: Small, brown or olive-green spots on the skin of the fruit. Lesions that become sunken and corky, and may crack, allowing entry of other diseases.