Phytophthora megasperma

Phytophthora megasperma is a species of oomycetes, a group of microorganisms that are similar to fungi. This species is known for causing diseases in a variety of plant species, including soybeans, apple trees, and Douglas fir trees.

Taxonomy

Phytophthora megasperma belongs to the genus Phytophthora, which is part of the family Pythiaceae. The species was first described in 1970 by the mycologist D.C. Erwin and others. The name "megasperma" comes from the Greek words for "large" and "seed", referring to the large oospores produced by this species.

Description

Phytophthora megasperma is a heterothallic species, meaning that it requires two different mating types for sexual reproduction. The mycelium of P. megasperma is coenocytic, lacking cross-walls. The sporangia are papillate and semi-papillate, and the oogonia are smooth-walled with paragynous antheridia.

Pathogenicity

Phytophthora megasperma is a plant pathogen, causing diseases in a variety of plant species. It is known to cause root rot in soybeans, collar rot in apple trees, and root and crown rot in Douglas fir trees. The pathogen is spread through the soil and water, and can survive in the soil for several years as oospores.

Management

Management of Phytophthora megasperma involves a combination of cultural practices and chemical control. Cultural practices include crop rotation, use of resistant varieties, and proper irrigation management. Chemical control involves the use of fungicides, such as metalaxyl and fosetyl-Al.

See also

• Phytophthora infestans
• Phytophthora ramorum
• Phytophthora sojae

References

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