Neem oil and Neem cake are highly versatile and can be used to treat a wide range of plant diseases, primarily due to its antifungal, antibacterial, and insecticidal properties. Here’s an extensive list of plant diseases that neem oil can help manage:

Powdery Mildew - A common fungal disease that causes a white, powdery substance on leaves and stems.

Black Spot - A fungal disease that creates black spots on leaves, common in roses.

Rust - Fungal disease causing orange or rust-colored spots, often found on the undersides of leaves.

Anthracnose - A group of fungal diseases that cause dark, sunken lesions on leaves, stems, flowers, and fruit.

Leaf Spot - Fungal or bacterial diseases that cause spots on leaves, leading to yellowing or browning.

Downy Mildew - A fungal disease causing yellowish patches on leaves, often with a downy growth on the underside.

Botrytis Blight (Gray Mold) - A fungal disease that causes gray mold on flowers, leaves, and fruits.

Fusarium Wilt - A soil-borne fungal disease that causes wilting and yellowing of leaves.

Blight - General term for various fungal or bacterial diseases that cause plant tissue to die rapidly.

Scab - A fungal disease affecting fruits, causing rough, cracked areas on the skin.

Sooty Mold - A black, sooty fungal growth that occurs on plant surfaces, often where there is a honeydew excretion from insects.

Root Rot - A fungal disease caused by overly wet soil conditions, leading to decaying roots.

Septoria Leaf Spot - A fungal disease that causes small, circular spots on leaves, particularly in tomatoes.

Cercospora Leaf Spot - A fungal disease that creates circular or irregularly shaped spots on leaves.

Verticillium Wilt - A fungal disease that causes leaves to yellow and wilt, often starting on one side of the plant.

Pythium - A root rot disease often found in overly moist conditions.

Alternaria Leaf Spot - A fungal disease causing dark, concentric rings on leaves.

Southern Blight - A fungal disease that causes rapid wilting and death of plants.

Rhizoctonia - A soil-borne fungal disease that causes damping-off in seedlings and root rot in mature plants.

Fire Blight - A bacterial disease affecting fruit trees, particularly apples and pears.

Canker Diseases - Various diseases causing sunken, dead areas on stems and branches.

Bacterial Leaf Blight - A bacterial disease causing water-soaked lesions on leaves.

Tomato Blight (Early and Late Blight) - Fungal diseases causing dark lesions on leaves and fruit of tomatoes.

Phytophthora - A group of plant-damaging oomycetes causing root, stem, and fruit rot.

And many more...