Abstract
The literature on the entomopathogenic fungi in the genus Cordyceps describing its use in the agricultural area as a biocontrol agent is limited. In this study, a total of 47 isolates of entomopathogenic fungi were isolated from dead cicada nymphs obtained from various locations in the northeast of Thailand. These isolates were primarily screened for antagonistic activity to inhibit the mycelial growth of one isolate of Colletotrichum gloeosporioides and one isolate of C. capsici. The screen revealed that five isolates of entomopathogenic fungi showed good inhibitory effects on the fungal mycelial growth and were chosen for further confirmation of their antagonistic effects against five isolates of C. gloeosporioides and five isolates of C. capsici by the dual culture method. After investigation, the isolate Cod-NB1302 had the best inhibitory effect. Moreover, the mycelium extract and culture filtrate of isolate Cod-NB1302 also had inhibitory effects on the mycelial growth and conidial germination of all isolates of plant pathogenic Colletotrichum spp. under in vitro conditions. Interestingly, the mycelium extract and culture filtrate effectively reduced the size of the disease lesion and disease severity on chili fruits after inoculation with the plant pathogenic fungi. However, the mycelium extract exhibited greater antifungal activity than the culture filtrate. Finally, the isolate Cod-NB1302 was identified as Ophiocordyceps sobolifera based on the sequence of three ribosomal nuclear DNA genes and two protein-coding genes. These findings suggest that the isolate Cod-NB1302 is a potential candidate, with antagonistic activity, for use as a source of antifungal agents to control anthracnose disease caused by the plant pathogenic Colletotrichum spp.
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Acknowledgments
The authors express their thanks to the Mahasarakham University for providing financial support for this study (grant no. 5601010/2556), as well as the Mahasarakham University Faculty of Science for providing equipment. P. Jaihan gratefully thanks the Human Resource Development in Science Project (Science Achievement Scholarship of Thailand; SAST). Finally, we thank Dr. Jolyon Dodgson for language editing of the manuscript.
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Jaihan, P., Sangdee, K. & Sangdee, A. Selection of entomopathogenic fungus for biological control of chili anthracnose disease caused by Colletotrichum spp.. Eur J Plant Pathol 146, 551–564 (2016). https://doi.org/10.1007/s10658-016-0941-7
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DOI: https://doi.org/10.1007/s10658-016-0941-7