Asteridiella perseae

Asteridiella perseae is a species of fungus in the family Erysiphaceae. It is a plant pathogen that primarily affects the avocado tree, causing a disease known as Avocado black streak.

Taxonomy

The species was first described in 1933 by American mycologist Howard James Banker. The genus name Asteridiella refers to the star-shaped asci that are characteristic of this group of fungi. The species name perseae is derived from Persea, the genus of the avocado tree, indicating the host plant of this fungus.

Description

Asteridiella perseae is a powdery mildew fungus. It produces white, powdery mycelium on the surface of the host plant. The conidia are produced in chains and are ellipsoid in shape. The asci are star-shaped, a characteristic feature of the genus Asteridiella.

Distribution and habitat

Asteridiella perseae is found in avocado-growing regions around the world, including California, Florida, Mexico, and South Africa. It thrives in warm, humid conditions and is most prevalent during the rainy season.

Pathogenicity

Asteridiella perseae causes Avocado black streak, a serious disease of avocado trees. The disease is characterized by black streaks on the trunk and branches, wilting of leaves, and premature fruit drop. In severe cases, it can lead to the death of the tree.

Management

Control of Avocado black streak involves the use of fungicides and cultural practices such as pruning infected branches and improving drainage to reduce humidity. Resistant varieties of avocado are also being developed.

See also

• List of avocado diseases
• Erysiphales