Which fungal disease is characterized by white fuzzy growth along the top of leaves and stems?

The description of a fungal disease characterized by white fuzzy growth along the top of leaves and stems corresponds to powdery mildew. This disease is caused by a number of different fungal pathogens and is recognizable by its distinctive white, powdery appearance, which often forms on the upper surfaces of leaves and stems. The fungal spores thrive in warm, dry conditions and can affect a wide variety of plants, causing leaves to become yellowed and eventually die if left untreated.

Powdery mildew can significantly affect the health of the plant as it impairs photosynthesis by covering leaf surfaces and can also weaken the plant, making it more susceptible to other diseases. Effective management practices include improving air circulation around plants, using resistant plant varieties, and applying fungicides when necessary.