During the monitoring of oak decline phenomenon in Slovakia, symptoms indicative of Phytophthora diseases were observed in sessile oak stands in western Slovakia. The study aimed to test the presence and diversity of Phytophthora species associated with declining oak stands. From rhizosphere soil samples, Phytophthora plurivora, P. quercina and Pythium intermedium were detected. Soil inoculation tests with P. plurivora and P. quercina on 1‐year‐old oak plants inflicted damage to the root system, and significant differences in measured root parameters between the inoculated and control treatments after 5 months. Although more wilting symptoms were observed in P. plurivora—infected seedlings (7 out of 12 inoculated seedlings), P. quercina caused the highest amount of damage to root systems, and for example, fine root length was 1.6 times shorter compared to the control. To our knowledge, this is the first report of P. plurivora and P. quercina in sessile oak stands in Slovakia.

中文翻译：

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无柄橡树（栎栎（Mat。）Liebl。）中疫霉菌的分离和致病力在斯洛伐克

在监测斯洛伐克的橡树衰退现象期间，在斯洛伐克西部的无梗橡树林中观察到了指示疫霉病的症状。该研究旨在测试与下降的栎林相关的疫霉菌的存在和多样性。从根际土壤样品中检出了疫霉菌，槲皮疫霉和中间腐霉。P. plurivora和quercina的土壤接种测试1个月大的橡树植物对根系造成了损害，并且在接种后5个月与对照之间根系参数的测量值存在显着差异。尽管在P. plurivora感染的幼苗中观察到了更多的萎symptoms症状（接种的12株幼苗中有7株），但quercina对根系造成的损害最大，例如，细根长度比对照短1.6倍。据我们所知，这是斯洛伐克无柄栎林中P. plurivora和P. quercina的首次报道。