Alternaria citri

Alternaria citri is a species of fungus that belongs to the Alternaria genus. It is known for causing a disease known as Alternaria black rot in citrus fruits, particularly oranges, lemons, and grapefruits.

Taxonomy

The species name citri is derived from the Latin word for citrus, reflecting the fungus's association with citrus plants. It belongs to the Alternaria genus, which comprises more than 300 species. These fungi are characterized by their darkly pigmented spores and their ability to cause disease in a variety of plants.

Description

Alternaria citri is a filamentous fungus that produces dark, multicellular spores. These spores are typically borne on simple or branched conidiophores, which are specialized structures that the fungus uses to disseminate its spores. The spores of Alternaria citri are typically oval or oblong in shape and have a rough, textured surface.

Pathogenicity

Alternaria citri is a pathogen that causes Alternaria black rot in citrus fruits. This disease is characterized by the development of dark, sunken lesions on the fruit's surface. As the disease progresses, the fruit may become completely rotted and unmarketable.

The fungus can infect the fruit at any stage of development, but it is most damaging to mature fruits. The spores of Alternaria citri can survive in the soil and on plant debris, and they can be spread by wind, rain, and insects.

Management

Management of Alternaria citri and the disease it causes involves a combination of cultural practices and chemical controls. Cultural practices include the removal and destruction of infected fruits and plant debris, which can reduce the number of spores available to initiate new infections. Chemical controls typically involve the application of fungicides to protect the fruit from infection.

See also

• Alternaria
• Alternaria black rot
• Citrus