Phyllosticta perseae

Phyllosticta perseae is a species of fungus that belongs to the family Phyllostictaceae. It is known to cause a disease in avocado trees known as avocado leaf spot.

Taxonomy

The species was first described in 1910 by the American mycologist George Francis Atkinson. The genus name Phyllosticta comes from the Greek words phyllon (leaf) and sticta (spotted), referring to the leaf spots caused by these fungi. The species name perseae refers to the host plant, the avocado (Persea americana).

Description

Phyllosticta perseae produces small, black, fruiting bodies known as pycnidia. These structures are embedded in the leaf tissue and produce conidia, or asexual spores, which are spread by wind and rain.

Disease cycle

The disease cycle of Phyllosticta perseae begins when conidia are spread to the leaves of a host plant. The conidia germinate and penetrate the leaf tissue, causing small, circular, brown spots. As the disease progresses, the spots may coalesce, causing extensive leaf damage. The fungus overwinters in fallen leaves and produces new conidia in the spring.

Management

Management of Phyllosticta perseae involves cultural practices such as regular pruning to improve air circulation and reduce leaf wetness, and sanitation practices such as removal of fallen leaves to reduce the source of inoculum. Fungicides may also be used as part of an integrated pest management program.

Economic importance

Phyllosticta perseae is of economic importance due to its impact on avocado production. Avocado leaf spot can reduce tree vigor and yield, and in severe cases, can lead to tree death.

See also

• List of avocado diseases
• Phyllosticta citricarpa
• Phyllosticta capitalensis