Question

Which of the following causes gray mold rot in vegetables, at high humidity and warm temperature?

• A. Alternaria solani
• B. Fusarium solani
• C. Trichoderma harzianum
• D. Botrytis cinerea

Hint:

While Botrytis cinerea is a devastating post-harvest rot pathogen of fruits and vegetables, in viticulture (wine-making), a controlled infection of grapes by this same fungus is welcomed as "noble rot" (pourriture noble), which concentrates grape sugars to produce premium sweet dessert wines.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Many filamentous fungi (molds) are major post-harvest pathogens of fresh produce.
They cause characteristic rots under warm, damp, and highly humid storage conditions.

Step 2: Detailed Explanation:
- {Botrytis cinerea is a necrotrophic plant-pathogenic fungus that causes gray mold rot (or grey mould) in a wide variety of vegetables (such as tomatoes, onions, carrots, and lettuce) and soft fruits (especially strawberries and grapes).
It thrives in cool-to-warm temperatures and extremely high relative humidity, producing a dense, velvety, gray layer of mycelia and asexual spores (conidia) over the rotting plant tissues.
- Alternaria solani causes early blight in solanaceous crops.
- Fusarium solani causes root rots and wilts.

Step 3: Final Answer:
The mold responsible for gray mold rot is Botrytis cinerea, which corresponds to option (D).