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Heart Rot Disease of Walnut Caused by Nothophoma juglandis sp. nov. and Its Endophytic Biocontrol Agent.

Authors :
Zhao L
Sun W
Zhang L
Yin Y
Xie Y
Zhang Y
Source :
Plant disease [Plant Dis] 2024 Mar; Vol. 108 (3), pp. 746-756. Date of Electronic Publication: 2024 Mar 19.
Publication Year :
2024

Abstract

English walnut ( Juglans regia L.) is an economically important hardwood tree species cultivated worldwide. Walnut heart rot disease leading to heartwood decay of trees has been frequently observed in a number of plantations in China. To identify the causal agent, 29 diseased stem samples were collected from walnut plantations in Beijing, and 54 fungal isolates were obtained. Koch's postulates were developed, and the results showed that Nothophoma juglandis , a species new to science, was the causal agent of walnut heart rot disease. Granulobasidium vellereum , a notable biocontrol agent, was coisolated with N. juglandis . An antagonistic assay on dual culture and walnut stems (both in the field and detached branches) proved that G. vellereum acted as a potential biocontrol agent against N. juglandis , as it could significantly inhibit the expansion of N. juglandis . The optimal temperature for mycelial growth and pathogenicity of N. juglandis was 26.6 and 27.0°C, respectively, which frequently occur in the summer of the walnut-growing regions in China.<br />Competing Interests: The author(s) declare no conflict of interest.

Details

Language :
English
ISSN :
0191-2917
Volume :
108
Issue :
3
Database :
MEDLINE
Journal :
Plant disease
Publication Type :
Academic Journal
Accession number :
37787687
Full Text :
https://doi.org/10.1094/PDIS-11-22-2660-RE