Phytophthora syringae is an oomyceteplant pathogen known to infect nursery plants, particularly apple and pear trees.[1] It infects plants through wounded areas and is most pathogenic during cold, wet weather.
References
^Laywisadkul, S., Fuchigami, L.H., Scagel, C.F., Linderman, R.G. Tree Growth Stage and Environment After Pathogen Inoculation Alters Susceptibility of Pear Trees to Phytophthora Canker. Open Horticulture Journal v3 (2010).
