Pythium arrhenomanes

Pythium arrhenomanes is a species of oomycete that is known to cause diseases in various plant species. It is a member of the genus Pythium, which is part of the Oomycota phylum. This species is particularly known for causing Pythium root rot in rice and other cereal crops.

Taxonomy

The species was first described in 1925 by Edwin John Butler, a British mycologist. It belongs to the genus Pythium, which is part of the family Pythiaceae. The genus Pythium is characterized by the production of coenocytic mycelium and zoospores.

Morphology

The hyphae of Pythium arrhenomanes are coenocytic, meaning they lack septa except in the reproductive structures. The oogonia are spherical and the antheridia are monoclinous, meaning they are produced on the same hyphae as the oogonia. The oospores are thick-walled and smooth.

Pathogenicity

Pythium arrhenomanes is a pathogen of several plant species, including rice, wheat, and barley. It causes a disease known as Pythium root rot, which is characterized by the rotting of the roots and lower stem. The disease can lead to significant yield losses in affected crops.

Management

Management of Pythium arrhenomanes involves a combination of cultural practices and chemical control. Cultural practices include crop rotation and the use of resistant varieties. Chemical control involves the use of fungicides.

See also

• Pythium root rot
• Oomycota
• Edwin John Butler

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