Phytophthora alni

Erlensterben

Phytophthora alni

Phytophthora alni is a species of water mold that causes root rot and leaf disease in alder trees. It is a significant pathogen in forests and landscapes where alders are present. The disease caused by Phytophthora alni is known as alder root rot or alder dieback.

Description

Phytophthora alni is a filamentous oomycete that thrives in wet and waterlogged soils. It infects the roots of alder trees, leading to root rot and subsequent decline in tree health. The pathogen can also spread to the above-ground parts of the tree, causing leaf necrosis and dieback.

Symptoms

Symptoms of Phytophthora alni infection in alder trees include yellowing and wilting of leaves, dieback of branches, and overall decline in tree vigor. In severe cases, the tree may die due to extensive root damage caused by the pathogen.

Management

Management of Phytophthora alni involves improving drainage in affected areas to reduce waterlogging, as the pathogen thrives in wet conditions. Fungicides can also be used to control the spread of the disease, although prevention through good cultural practices is key to managing Phytophthora alni.

Prevention

Preventing Phytophthora alni infection involves planting alder trees in well-drained soils and avoiding overwatering. Monitoring tree health regularly and promptly addressing any signs of disease can help prevent the spread of the pathogen.

See also

• Phytophthora cinnamomi
• Alder tree diseases