Phytophthora cryptogea

Phytophthora cryptogea is a species of oomycete that is known to cause various plant diseases. It is a member of the genus Phytophthora, which is part of the Peronosporaceae family. This species is particularly known for its ability to cause root rot in a wide range of host plants.

Taxonomy

The species was first described in 1923 by P.A. van der Bijl, a Dutch mycologist. It belongs to the kingdom Chromista, phylum Oomycota, and class Peronosporomycetes. Within the genus Phytophthora, it is part of the cryptogea complex, a group of closely related species that also includes Phytophthora cactorum and Phytophthora megasperma.

Morphology

Phytophthora cryptogea produces both sporangia and oospores. The sporangia are papillate and have a variable shape, often being obpyriform (pear-shaped). The oospores are thick-walled and have a smooth outer surface.

Pathogenicity

Phytophthora cryptogea is a necrotrophic pathogen, meaning it kills host tissue and then feeds on the dead material. It is capable of infecting a wide range of plant species, including ornamental plants, fruit trees, and vegetables. Some of the diseases it causes include root rot, crown rot, and stem canker.

Management

Control of Phytophthora cryptogea involves a combination of cultural practices, chemical treatments, and the use of resistant plant varieties. Cultural practices include proper irrigation management to avoid creating conditions that favor the pathogen. Chemical treatments can include the use of fungicides and methyl bromide. Resistant plant varieties are also an important part of management strategies.

See also

• Phytophthora infestans
• Phytophthora ramorum
• Phytophthora sojae