Applied and Environmental Microbiology (2016) 82, 4696-4704

Rio A. Stamler, Soumalia Sanogo, Natalie P. Goldberg and Jennifer J. Randall (2016)
Phytophthora species in rivers and streams of the southwestern United States
Applied and Environmental Microbiology 82 (15), 4696-4704
Abstract: Phytophthora species were isolated from rivers and streams in the southwestern United States by leaf baiting and identified by sequence analysis of internal transcribed spacer (ITS) ribosomal DNA (rDNA). The major waterways examined included the Rio Grande River, Gila River, Colorado River, and San Juan River. The most prevalent species identified in rivers and streams were Phytophthora lacustris and P. riparia, both members of Phytophthora ITS clade 6. P. gonapodyides, P. cinnamomi, and an uncharacterized Phytophthora species in clade 9 were also recovered. In addition, six isolates recovered from the Rio Grande River were shown to be hybrids of P. lacustris × P. riparia. Pathogenicity assays using P. riparia and P. lacustris failed to produce any disease symptoms on commonly grown crops in the southwestern United States. Inoculation of Capsicum annuum with P. riparia was shown to inhibit disease symptom development when subsequently challenged with P. capsici, a pathogenic Phytophthora species.
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Link to article at publishers website
Database assignments for author(s): Jennifer J. Randall, Soum Sanogo

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora cinnamomi		U.S.A. (SW)
	Phytophthora gonapodyides		U.S.A. (SW)
	Phytophthora lacustris		U.S.A. (SW)