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United States Department of Agriculture

Agricultural Research Service

Related Topics

Research Project: Use of Wetland Systems to Treat Nursery Runoff

Location: Subtropical Insects and Horticulture Research

2013 Annual Report


1a.Objectives (from AD-416):
The objectives of this cooperative research project are to assess the potential of a newly constructed wetland system to assimilate horticultural chemicals prior to entry into water bodies and to assess the potential for phytopathogen remediation using constructed wetland systems.


1b.Approach (from AD-416):
Monitor runoff water (volume and quality) entering and leaving a wetland system, and sample wetland sediments and plants for nutrients and pesticides of concern. Nurtient and pesticide balance will be calculated and the efficency of the wetland phytopathogen remediation will be assessed and wetland plant susceptibility to pathogen infestation characterized.


3.Progress Report:

This project is related to Objective 2 of the in-house project: Effluent Water Quality.

Field monitoring of wetland plants susceptibility to spp. of Phytophthora is ongoing. Thus far over 350 plants samples and plated subsamples of the root systems to determine if any spp. of Phytophthora had colonized the plant root systems have been collected. Thus far, 22 Phytophthora isolates (6 spp. of Phytophthora definitively identified) have been collected from 10 of the 14 plant species screened. Additional sampling is ongoing, with an expanded palette of plants sampled to better characterize prevalence of Phytophthora hosts within the constructed wetland systems. Not only does this data provide information pertaining to plant susceptibility, but serves as a map showing Phytophthora occurrence patterns throughout the water containment and treatment infrastructure. Most plant species infested with Phytophthora were established within production runoff channels, and not within the treatment wetlands proper.


Last Modified: 4/19/2014
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