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USDA Issues Notice of Newly Detected Phytophthora

Friday, May 06, 2016   (0 Comments)
Posted by: Jennifer Addington
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USDA Issues Notice of Newly Dedected



Phytophthora chrysanthemi is an oomycete, a fungus-like organism that reproduces sexually through oogonia and asexually through chlamydospores, sporangia, zoospores, and mycelia (Naher et al., 2011). Chlamydospores and oogonia are often the survival structures for Phytophthora spp. (Erwin and Ribeiro, 1996), but their role in the life cycle of P. chrysanthemi is unknown. Phytophthora chrysanthemi is tolerant of high temperatures, with optimum growth in culture at 30°C and growth still occurring at 35°C (Naher et al., 2011; Yang et al., 2014). It belongs to a small cluster of Phytophthora species in Clade 9 that have been called "high-temperature tolerant" (Yang et al., 2014). Click here for the full alert.


Note: We heard from Dr. Jean Williams-Woodward regarding this pest who noted that this sew species may not be of any more concern than other species already on the industry's radar. Stay tuned and we will report if more news becomes available. 

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