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Crown rot refers to a plant disease that affects the crown of a plant, which is the area where the stem meets the soil. It is a serious condition that can affect various types of plants, including both ornamental and crop plants. The term "crown rot" is often used generically to describe different diseases caused by various pathogens.

The most common causes of crown rot are fungal pathogens, including species of Phytophthora, Rhizoctonia, and Fusarium. These fungi thrive in wet or waterlogged soil conditions, and their spores can infect the plant's crown, leading to rotting and decay.

Symptoms of crown rot may include wilting, yellowing of leaves, and a general decline in the health of the plant. As the disease progresses, the plant's crown may become discolored, soft, and decayed. In severe cases, the entire plant may die.

Preventing crown rot involves maintaining proper soil drainage and avoiding overwatering, as these conditions create an environment conducive to fungal growth. Additionally, using disease-resistant plant varieties and practicing good garden hygiene can help reduce the risk of crown rot.

If crown rot is suspected, it's essential to remove and destroy infected plants to prevent the spread of the disease. Fungicides may be used as a preventive measure or to manage the disease, but they are often more effective when combined with cultural practices that promote overall plant health.