Phytophthora parasitica

Phytophthora parasitica is a species of oomycete, a group of fungus-like microorganisms, that is known for its pathogenicity in a wide range of plant species. It is a member of the genus Phytophthora, which includes other notable plant pathogens such as Phytophthora infestans and Phytophthora ramorum.

Taxonomy

Phytophthora parasitica belongs to the kingdom Stramenopiles, which also includes other oomycetes, diatoms, and brown algae. Within the genus Phytophthora, it is part of the Phytophthora parasitica complex, a group of closely related species that are often difficult to distinguish based on morphology alone.

Morphology

Like other oomycetes, Phytophthora parasitica produces sporangia, structures that generate and release spores. The sporangia of P. parasitica are typically oval or pear-shaped and can produce both zoospores and oospores.

Pathogenicity

Phytophthora parasitica is a necrotrophic pathogen, meaning it kills host tissue and then feeds on the dead cells. It is capable of infecting a wide range of plant species, including important agricultural crops such as tomato, pepper, and eggplant, as well as ornamental plants like rhododendron and azalea.

Management

Control of Phytophthora parasitica in agricultural settings often involves a combination of cultural practices, such as crop rotation and sanitation, and the use of fungicides. Resistant cultivars are also an important tool in managing this pathogen.

See also

• Phytophthora cinnamomi
• Phytophthora sojae
• Phytophthora capsici

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