Phytophthora cactorum

Phytophthora cactorum is a plant pathogen species in the genus Phytophthora. It is known to cause diseases in a wide range of host plants, including fruit trees, ornamental plants, and agricultural crops.

Taxonomy

Phytophthora cactorum belongs to the Oomycetes class, which is a group of fungus-like microorganisms. It is part of the Phytophthora genus, which comprises around 150 species. The species name 'cactorum' indicates its initial discovery on cactus plants.

Hosts and Symptoms

Phytophthora cactorum has a broad host range, affecting numerous plant species. It is known to cause root rot, crown rot, and collar rot in apple trees, strawberries, and rhododendrons among others. Symptoms often include wilting, yellowing of leaves, and the eventual death of the plant.

Disease Cycle

The disease cycle of Phytophthora cactorum begins with the production of sporangia, which release zoospores that can swim in water and infect host plants. The pathogen can also produce oospores that can survive in soil for several years, providing a source of infection for future crops.

Management

Management of Phytophthora cactorum involves a combination of cultural practices and chemical control. Cultural practices include proper irrigation management, crop rotation, and the use of resistant varieties. Chemical control often involves the use of fungicides.

Economic Impact

Phytophthora cactorum can cause significant economic losses in agriculture, particularly in fruit production such as apples and strawberries. It can also impact the ornamental plant industry by affecting popular species such as rhododendrons.

See Also

• Phytophthora
• Plant Pathology
• Oomycetes