Podosphaera leucotricha

Podosphaera leucotricha is a fungal species that belongs to the Erysiphales order. It is known for causing powdery mildew in apple trees, a common disease that affects a wide range of plants.

Taxonomy

The species was first described by Ernst Albert Gäumann, a Swiss mycologist, in 1918. It belongs to the Podosphaera genus, which comprises over 100 species of fungi that cause powdery mildew in various plants.

Description

Podosphaera leucotricha is a biotrophic fungus, meaning it derives its nutrients from living plant cells. The fungus forms white, powdery spots on the surface of leaves, shoots, and fruit. These spots are made up of asexual spores called conidia, which are spread by wind to other parts of the plant or to other plants.

Life Cycle

The life cycle of Podosphaera leucotricha involves both sexual and asexual reproduction. The fungus overwinters as ascospores in fruiting bodies called cleistothecia. In the spring, the ascospores are released and infect new growth. The fungus then produces conidia, which are spread to other parts of the plant or to other plants.

Disease Management

Management of powdery mildew caused by Podosphaera leucotricha involves a combination of cultural practices and chemical control. Cultural practices include pruning to improve air circulation and reduce humidity, and removing infected plant material. Chemical control involves the use of fungicides, which should be applied at the first sign of disease.

Economic Impact

Powdery mildew caused by Podosphaera leucotricha can have a significant economic impact on apple production. The disease reduces the quality and yield of the fruit, leading to financial losses for growers.

See Also

• List of Podosphaera species
• Powdery mildew
• Apple production