期刊
PLANTS-BASEL
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/plants12051072
关键词
Cinnamomum camphora; Phytopythium vexans; root rot; identification; fungicides
This study identified Phytophthora vexans as the pathogen causing root rot in camphor trees. The pathogenicity of P. vexans was confirmed through inoculation tests and it was found to be sensitive to metalaxyl hymexazol. This research provides a theoretical basis for future control strategies to prevent camphor tree diseases.
As a famous street tree, camphor (Cinnamomum camphora) is widely planted worldwide. However, in recent years, camphor with root rot was observed in Anhui Province, China. Based on morphological characterization, thirty virulent isolates were identified as Phytopythium species. Phylogenetic analysis of combined ITS, LSU rDNA, beta-tubulin, coxI, and coxII sequences assigned the isolates to Phytopythium vexans. Koch's postulates were fulfilled in the greenhouse, and the pathogenicity of P. vexans was determined by root inoculation tests on 2-year-old camphor seedlings; the symptoms of indoor inoculation were consistent with those in the field. P. vexans can grow at 15-30 degrees C, with an optimal growth temperature of 25-30 degrees C. The results of fungicide sensitivity experiments indicated that P. vexans was the most sensitive to metalaxyl hymexazol, which may be a useful idea for the future prevention and control management of P.vexans. This study provided the first step for further research on P. vexans as a pathogen of camphor, and provided a theoretical basis for future control strategies.
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