Plant Disease (2003) 87, 1500-1506

Elizabeth A. Bush, Chuanxue Hong and Erik L. Stromberg (2003)
Fluctuations of Phytophthora and Pythium spp. in components of a recycling irrigation system
Plant Disease 87 (12), 1500-1506
Abstract: Stringent standards of water quality have prompted many horticultural enterprises to limit pollutant discharge associated with nutrient and pesticide applications. Collecting and recycling effluent is a method that has been implemented by many operations to contain pollutants; however, plant pathogens may be spread through recycled effluent. In this study, Phytophthora and Pythium spp. present in a water-recycling irrigation system at a perennial container nursery in southwestern Virginia were characterized using filtering and baiting techniques with two selective media. Members of Phytophthora were identified to species, whereas Pythium spp. were identified to genus only. Pythium spp. were recovered more frequently and in greater numbers than Phytophthora spp. Phytophthora capsici, P. citricola, P. citrophthora, P. cryptogea, P. drechsleri, and P. nicotianae were recovered in filtering assays. Only P. cryptogea and P. drechsleri were identified from baits placed on the surface of the irrigation reservoir, whereas P. cactorum, P. capsici, P. citricola, P. citrophthora, P. cryptogea, and P. drechsleri were recovered at depths, specifically at 1 and 1.5 m. This research provides data for development of detection technology and management practices for plant pathogens in irrigation water and may lead to improvements in conventional assay protocols.
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Database assignments for author(s): Chuan-Xue Hong

Research topic(s) for pests/diseases/weeds:
transmission/dispersal of plant diseases
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora citrophthora		U.S.A. (NE)
	Phytophthora capsici		U.S.A. (NE)
	Phytophthora citricola		U.S.A. (NE)
	Phytophthora cryptogea		U.S.A. (NE)
	Phytophthora drechsleri		U.S.A. (NE)
	Phytophthora nicotianae		U.S.A. (NE)