Question

Powder mildew disease is caused by ______

• A. Bacteria
• B. Fungus
• C. Virus
• D. Nematodes

Hint:

Remember: "Powdery" growth on plants = Fungal disease. Bacteria cause spots with water-soaked appearance, viruses cause mosaic patterns, and nematodes affect roots.

Answer 1

The Correct Option is B

Step 1: Understanding the Question
The question asks to identify the type of pathogen that causes the plant disease known as powdery mildew.
Step 2: Detailed Explanation
Powdery mildew is one of the most common and easily recognizable plant diseases.

Symptom: It appears as white or grayish powdery spots on the leaves and stems of plants.

Causative Agent: This characteristic powdery growth is the mycelium and spores of a specific group of fungi (from the order Erysiphales). It is a classic example of a fungal disease.

Other pathogens cause different symptoms: Bacteria often cause wet rots or leaf spots; Viruses cause mosaic patterns or stunting; Nematodes are worms that typically damage roots.

Step 3: Final Answer
Powdery mildew disease is caused by a fungus.