Question

A plant disease in which the pathogen is seen as a cottony growth on the surface of host is called :

• A. Rust
• B. Smut
• C. Powdery mildew
• D. Downy mildew

Answer 1

Answer: (D)

Downy mildew

Downy mildew is an extremely serious fungal disease of grapes that can result in severe crop loss. It is caused by the fungus Plasmopara viticola. The pathogen attacks all green parts of the vine, especially the leaves. Lesions on leaves are angular, yellowish, sometimes oily, and located between the veins. As the disease progresses, a white cottony growth can be observed on the lower leaf surface.

So, the correct answer is 'Downy mildew'.