Phytophthora citrophthora

Phytophthora citrophthora is a species of oomycete, a group of fungus-like microorganisms, that is known to cause various diseases in plants. This species is part of the larger Phytophthora genus, which includes other notable plant pathogens.

Taxonomy

Phytophthora citrophthora was first described in 1923 by R.E. Smith and H.H. Whetzel. It belongs to the Peronosporaceae family of oomycetes. The genus name Phytophthora comes from the Greek words phyto (plant) and phthora (destruction), reflecting the destructive nature of these pathogens.

Morphology

The mycelium of Phytophthora citrophthora is coenocytic, meaning it lacks cross-walls. The sporangia are papillate and semi-papillate, and the oospores are thick-walled and persistent. The antheridia are amphigynous, meaning they can fertilize either the same oogonium they originate from or a different one.

Hosts and Symptoms

Phytophthora citrophthora is a versatile pathogen that can infect a wide range of host plants, including citrus, avocado, peach, and ornamental plants. Symptoms of infection can vary depending on the host, but often include root rot, crown rot, gummosis, and fruit rot. In citrus trees, the disease is commonly known as citrus gummosis.

Disease Management

Management of Phytophthora citrophthora involves a combination of cultural practices and chemical control. Cultural practices include proper irrigation management, as the pathogen thrives in waterlogged conditions. Chemical control typically involves the use of fungicides that are specific to oomycetes.

See Also

• Phytophthora
• Oomycete
• Citrus gummosis

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