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Occurrence of Phytophthora Species in Commercial Nursery Production

C. Junker, P. Goff, S. Wagner, and S. Werres

April 2016


Two commercial woody ornamental nurseries were sampled for the presence of Phytophthora over a period of 3 years. The samples were taken every 2 months at different sections of propagation (greenhouses, plastic tunnels) and cultivation (container stands) as well as from nearby pathways and from a water recycling system with slow sand filter. Different materials like soil, substrates, residues, wind-carried leaves, and water and sediment were sampled. In total 12 known Phytophthora species could be detected. Three isolates did not match any of the known species. P. ramorum, P. gonapodyides, and P. plurivora were the species with the highest detection rates. P. ramorum could be detected at all seasons of the year. In total, puddles on the pathways had the highest percentage of positive samples. Residues, wind-carried leaves, and water and sediment from the runoffs were also good places for Phytophthora survival. In both nurseries, the plant samples showed very low infection rates. Ideas for surveys and management are discussed.


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