Diplocarpon mespili

== Diplocarpon mespili ==

Diplocarpon mespili is a species of fungus in the family Dermateaceae. It is known for causing a disease commonly referred to as "leaf spot" or "scab" on certain host plants, particularly those in the Rosaceae family.

Description

Diplocarpon mespili is a pathogenic fungus that primarily affects the leaves of its host plants. The fungus produces dark, circular spots on the leaves, which can lead to premature leaf drop. The spots are typically black or brown and may have a yellow halo around them. As the disease progresses, the spots can coalesce, causing significant damage to the foliage.

Life Cycle

The life cycle of Diplocarpon mespili involves both sexual and asexual reproduction. The fungus overwinters in fallen leaves and other plant debris. In the spring, it produces spores that are spread by wind and rain to new leaves. The spores germinate and infect the leaves, leading to the development of the characteristic spots. The fungus can produce multiple generations of spores throughout the growing season, leading to repeated cycles of infection.

Host Plants

Diplocarpon mespili primarily infects plants in the Rosaceae family. Common hosts include:

• Crataegus (hawthorn)
• Mespilus (medlar)
• Amelanchier (serviceberry)

The susceptibility of these plants to infection can vary, with some cultivars being more resistant than others.

Symptoms

The primary symptom of Diplocarpon mespili infection is the appearance of dark spots on the leaves. These spots are often circular and may have a yellow margin. In severe cases, the spots can merge, causing large areas of the leaf to die. Infected leaves may fall prematurely, leading to defoliation and reduced plant vigor.

Management

Managing Diplocarpon mespili involves cultural practices and, if necessary, chemical control. Key management strategies include:

• Removing and destroying fallen leaves to reduce overwintering inoculum.
• Pruning to improve air circulation and reduce humidity around the foliage.
• Applying fungicides as a preventive measure, especially during wet weather conditions.

Related Pages

• Fungal plant pathogens
• Rosaceae
• Leaf spot